diff --git a/apps/web/src/admin/api.ts b/apps/web/src/admin/api.ts
index 8504aab..10ced12 100644
--- a/apps/web/src/admin/api.ts
+++ b/apps/web/src/admin/api.ts
@@ -1,3 +1,44 @@
+import { toAdminType, toProblemPermission } from "@oj2/contract"
+import type {
+  AddContestProblemRequest,
+  AddProblemsToSetRequest,
+  BatchProblemTagRequest,
+  BatchProblemVisibleRequest,
+  CheckUsernamesRequest,
+  CreateAchievementRequest,
+  CreateAnnouncementRequest,
+  CreateContestRequest,
+  CreateExerciseRequest,
+  CreateProblemRequest,
+  CreateProblemSetBadgeRequest,
+  CreateProblemSetRequest,
+  CreateTutorialRequest,
+  GenerateFlowchartRequest,
+  GenerateSqlTestCaseRequest,
+  ImportUsersRequest,
+  MakeProblemPublicRequest,
+  RenameTagRequest,
+  RenameTutorialProjectRequest,
+  ReorderContestProblemsRequest,
+  ReorderProblemSetProblemsRequest,
+  ReorderTutorialsRequest,
+  SetTagCategoryRequest,
+  SetTutorialProblemsRequest,
+  SetTutorialVisibilityRequest,
+  SqlPreviewRequest,
+  UpdateAchievementRequest,
+  UpdateAcmHelperRequest,
+  UpdateAnnouncementRequest,
+  UpdateContestRequest,
+  UpdateExerciseRequest,
+  UpdateProblemInSetRequest,
+  UpdateProblemRequest,
+  UpdateProblemSetBadgeRequest,
+  UpdateProblemSetRequest,
+  UpdateTutorialRequest,
+  UpdateUserRequest,
+  UpdateWebsiteConfigRequest,
+} from "@oj2/contract"
 import api from "utils/api"
 import { toAdminProblemRow } from "admin/transforms"
 import type {
@@ -101,7 +142,7 @@ export function batchSetProblemVisible(problemIds: number[], visible: boolean) {
   return api.post<{ problemCount: number }>("admin/problems/batch-visible", {
     problemIds,
     visible,
-  })
+  } satisfies BatchProblemVisibleRequest)
 }
 
 // 比赛「从题库中选择」用：列所有可见的公开题，不只是自己创建的
@@ -129,7 +170,7 @@ export function deleteContestProblem(id: number) {
 export function editProblem(problem: AdminProblem | BlankProblem) {
   return api.put<AdminProblem>(
     `admin/problems/${(problem as AdminProblem).id}`,
-    toProblemBody(problem),
+    toProblemBody(problem) satisfies Partial<UpdateProblemRequest>,
   )
 }
 
@@ -140,7 +181,7 @@ export function toggleProblemVisible(problemID: number) {
 export function generateFlowchartFromPythonCode(python: string) {
   return api.post<{ doc: Record<string, unknown> }>("admin/problems/flowchart", {
     python,
-  })
+  } satisfies GenerateFlowchartRequest)
 }
 
 export function getProblem(id: string | number) {
@@ -153,11 +194,13 @@ export function getTagAdminList(keyword = "") {
 }
 
 export function renameTag(id: number, name: string) {
-  return api.put<RenameTagResponse>(`admin/problem-tags/${id}`, { name })
+  return api.put<RenameTagResponse>(`admin/problem-tags/${id}`, { name } satisfies RenameTagRequest)
 }
 
 export function setTagCategory(id: number, category: TagCategory) {
-  return api.put<null>(`admin/problem-tags/${id}/category`, { category })
+  return api.put<null>(`admin/problem-tags/${id}/category`, {
+    category,
+  } satisfies SetTagCategoryRequest)
 }
 
 export function deleteTag(id: number) {
@@ -173,7 +216,7 @@ export function batchTagProblems(
     problemIds,
     tagNames,
     action,
-  })
+  } satisfies BatchProblemTagRequest)
 }
 
 // 用户排名（后台版，无 100 名上限；公开榜单是 oj/api.ts 的 getRank）
@@ -209,20 +252,23 @@ export function getUserList(
 
 /** 批量建号之前查重：这些用户名哪些已经有了 */
 export function checkUsernames(usernames: string[]) {
-  return api.post<CheckUsernamesResponse>("admin/users/check", { usernames })
+  return api.post<CheckUsernamesResponse>("admin/users/check", {
+    usernames,
+  } satisfies CheckUsernamesRequest)
 }
 
 // 编辑用户
 export function editUser(user: AdminUserForm) {
   return api.put<AdminUser>(`admin/users/${user.id}`, {
     username: user.username,
-    email: user.email,
-    adminType: user.adminType,
-    problemPermission: user.problemPermission,
+    // 库里 email 没有空的（2026-10 核过），响应类型是 nullable 只因为列可空
+    email: user.email ?? "",
+    adminType: toAdminType(user.adminType),
+    problemPermission: toProblemPermission(user.problemPermission),
     realName: user.realName ?? null,
     isDisabled: user.isDisabled,
     password: user.password ?? "",
-  })
+  } satisfies UpdateUserRequest)
 }
 
 // 重置用户密码，返回新密码
@@ -233,8 +279,10 @@ export async function resetPassword(userID: number) {
 
 // 导入用户
 /** 批量建号。addedClasses：这批里的新班级，后端已经顺手加进了班级列表 */
-export function importUsers(users: string[][]) {
-  return api.post<{ imported: number; addedClasses: string[] }>("admin/users", { users })
+export function importUsers(users: ImportUsersRequest["users"]) {
+  return api.post<{ imported: number; addedClasses: string[] }>("admin/users", {
+    users,
+  } satisfies ImportUsersRequest)
 }
 
 // 批量删除用户
@@ -282,7 +330,7 @@ export function previewSQLTestcase(data: {
   /** 是不是题面上展示的那组（第 1 组）：增删改题只有它必须改到行 */
   shown: boolean
 }) {
-  return api.post<SqlDisplay>("admin/sql-test-cases/preview", data)
+  return api.post<SqlDisplay>("admin/sql-test-cases/preview", data satisfies SqlPreviewRequest)
 }
 
 // 回显已上传的 SQL 测试点脚本内容（按 1.sql, 2.sql... 排序）
@@ -292,7 +340,10 @@ export function getSQLTestcaseScripts(problemId: number) {
 
 // AI 根据标准答案生成一个 SQL 测试点初始化脚本
 export function generateSQLTestcase(data: { refSql: string; mode: "query" | "modify" }) {
-  return api.post<GenerateSqlTestCaseResponse>("admin/sql-test-cases/generate", data)
+  return api.post<GenerateSqlTestCaseResponse>(
+    "admin/sql-test-cases/generate",
+    data satisfies GenerateSqlTestCaseRequest,
+  )
 }
 
 // 编程题出题页：读回已有测试点的原文（太大的只给数量和大小）
@@ -302,12 +353,15 @@ export function getTestCaseFiles(problemId: number) {
 
 // 拿标准答案自测语法要求
 export function checkAstRules(data: AstCheckRequest) {
-  return api.post<AstCheckResponse>("admin/ast-check", data)
+  return api.post<AstCheckResponse>("admin/ast-check", data satisfies AstCheckRequest)
 }
 
 // AI 按题面和标准答案想几组测试输入（输出由标准答案跑）
 export function generateTestInputs(data: GenerateTestInputsRequest) {
-  return api.post<GenerateTestInputsResponse>("admin/test-inputs/generate", data)
+  return api.post<GenerateTestInputsResponse>(
+    "admin/test-inputs/generate",
+    data satisfies GenerateTestInputsRequest,
+  )
 }
 
 /** 出站补默认值。字段名两边已经一致，不再做键名转换 */
@@ -346,14 +400,17 @@ function toProblemBody(problem: AdminProblem | BlankProblem) {
 }
 
 export function createProblem(problem: BlankProblem) {
-  return api.post<AdminProblem>("admin/problems", toProblemBody(problem))
+  return api.post<AdminProblem>(
+    "admin/problems",
+    toProblemBody(problem) satisfies Partial<CreateProblemRequest>,
+  )
 }
 
 export function createContestProblem(problem: BlankProblem) {
   // contestId 由 detail.vue 在提交前写进 problem 对象
   return api.post<AdminProblem>(
     `admin/contests/${problem.contestId}/problems`,
-    toProblemBody(problem),
+    toProblemBody(problem) satisfies Partial<CreateProblemRequest>,
   )
 }
 
@@ -371,13 +428,16 @@ function toContestBody(contest: AdminContest | BlankContest) {
 }
 
 export function createContest(contest: BlankContest) {
-  return api.post<AdminContest>("admin/contests", toContestBody(contest))
+  return api.post<AdminContest>(
+    "admin/contests",
+    toContestBody(contest) satisfies CreateContestRequest,
+  )
 }
 
 export function editContest(contest: AdminContest | BlankContest) {
   return api.put<AdminContest>(
     `admin/contests/${(contest as AdminContest).id}`,
-    toContestBody(contest),
+    toContestBody(contest) satisfies UpdateContestRequest,
   )
 }
 
@@ -393,12 +453,14 @@ export function addProblemForContest(contestID: string, problemID: number, displ
   return api.post<AdminProblem>(`admin/contests/${contestID}/problems/from-public`, {
     problemId: problemID,
     displayId: displayID,
-  })
+  } satisfies AddContestProblemRequest)
 }
 
 /** 比赛题按这个顺序重新编号 1、2、3…（要给全这场比赛的题） */
 export function reorderContestProblems(contestID: string, problemIds: number[]) {
-  return api.put(`admin/contests/${contestID}/problems/order`, { problemIds })
+  return api.put(`admin/contests/${contestID}/problems/order`, {
+    problemIds,
+  } satisfies ReorderContestProblemsRequest)
 }
 
 export function getWebsite() {
@@ -406,7 +468,7 @@ export function getWebsite() {
 }
 
 export function editWebsite(data: WebsiteConfig) {
-  return api.post<WebsiteConfig>("admin/website", data)
+  return api.post<WebsiteConfig>("admin/website", data satisfies UpdateWebsiteConfigRequest)
 }
 
 export function listInvalidTestcases() {
@@ -441,12 +503,18 @@ export function deleteAnnouncement(id: number) {
 
 export function editAnnouncement(announcement: AnnouncementEdit) {
   const { id, ...body } = announcement
-  return api.put<AdminAnnouncement>(`admin/announcements/${id}`, body)
+  return api.put<AdminAnnouncement>(
+    `admin/announcements/${id}`,
+    body satisfies UpdateAnnouncementRequest,
+  )
 }
 
 export function createAnnouncement(announcement: AnnouncementEdit) {
   const { id: _id, ...body } = announcement
-  return api.post<AdminAnnouncement>("admin/announcements", body)
+  return api.post<AdminAnnouncement>(
+    "admin/announcements",
+    body satisfies CreateAnnouncementRequest,
+  )
 }
 
 export function getTutorialList() {
@@ -470,15 +538,20 @@ function toTutorialBody(data: TutorialEdit) {
 }
 
 export function createTutorial(data: TutorialEdit) {
-  return api.post<Tutorial>("admin/tutorials", toTutorialBody(data))
+  return api.post<Tutorial>("admin/tutorials", toTutorialBody(data) satisfies CreateTutorialRequest)
 }
 
 export function updateTutorial(data: TutorialEdit) {
-  return api.put<Tutorial>(`admin/tutorials/${data.id}`, toTutorialBody(data))
+  return api.put<Tutorial>(
+    `admin/tutorials/${data.id}`,
+    toTutorialBody(data) satisfies UpdateTutorialRequest,
+  )
 }
 
 export function setTutorialProblems(id: number, problemIds: number[]) {
-  return api.put<Tutorial>(`admin/tutorials/${id}/problems`, { problemIds })
+  return api.put<Tutorial>(`admin/tutorials/${id}/problems`, {
+    problemIds,
+  } satisfies SetTutorialProblemsRequest)
 }
 
 export function getTutorialProblemCandidates(keyword: string) {
@@ -488,11 +561,15 @@ export function getTutorialProblemCandidates(keyword: string) {
 }
 
 export function reorderTutorials(ids: number[]) {
-  return api.put<null>("admin/tutorial-order", { ids })
+  return api.put<null>("admin/tutorial-order", { ids } satisfies ReorderTutorialsRequest)
 }
 
 export function renameTutorialProject(type: "python" | "c", from: string, to: string) {
-  return api.put<null>("admin/tutorial-projects", { type, from, to })
+  return api.put<null>("admin/tutorial-projects", {
+    type,
+    from,
+    to,
+  } satisfies RenameTutorialProjectRequest)
 }
 
 export function deleteTutorial(id: number) {
@@ -500,7 +577,9 @@ export function deleteTutorial(id: number) {
 }
 
 export function setTutorialVisibility(id: number, isPublic: boolean) {
-  return api.put<Tutorial>(`admin/tutorials/${id}/visibility`, { isPublic })
+  return api.put<Tutorial>(`admin/tutorials/${id}/visibility`, {
+    isPublic,
+  } satisfies SetTutorialVisibilityRequest)
 }
 
 export function getAdminExercises(tutorialId: number) {
@@ -510,16 +589,16 @@ export function getAdminExercises(tutorialId: number) {
 export async function createExercise(data: {
   tutorialId: number
   type: ExerciseType
-  data: object
+  data: Record<string, unknown>
   order: number
 }) {
-  return api.post<Exercise>("admin/exercises", data)
+  return api.post<Exercise>("admin/exercises", data satisfies CreateExerciseRequest)
 }
 
 export async function updateExercise(data: {
   id: number
   type: ExerciseType
-  data: object
+  data: Record<string, unknown>
   order: number
   resetAttempts: boolean
 }) {
@@ -528,7 +607,7 @@ export async function updateExercise(data: {
     data: data.data,
     order: data.order,
     resetAttempts: data.resetAttempts,
-  })
+  } satisfies UpdateExerciseRequest)
 }
 
 export function deleteExercise(id: number) {
@@ -539,7 +618,7 @@ export function deleteExercise(id: number) {
 export function makeProblemPublic(id: number, displayId: string) {
   return api.post<AdminProblem>(`admin/problems/${id}/make-public`, {
     displayId,
-  })
+  } satisfies MakeProblemPublicRequest)
 }
 
 // 比赛辅助检查
@@ -553,7 +632,7 @@ export function updateACMHelperChecked(
     rankId: rank_id,
     problemId: problem_id,
     checked,
-  })
+  } satisfies UpdateAcmHelperRequest)
 }
 
 // 题单管理 API
@@ -576,11 +655,14 @@ export interface ProblemSetBody {
 }
 
 export function createProblemSet(data: ProblemSetBody) {
-  return api.post<AdminProblemSet>("admin/problem-sets", data)
+  return api.post<AdminProblemSet>("admin/problem-sets", data satisfies CreateProblemSetRequest)
 }
 
 export function editProblemSet(id: number, data: ProblemSetBody) {
-  return api.put<AdminProblemSet>(`admin/problem-sets/${id}`, data)
+  return api.put<AdminProblemSet>(
+    `admin/problem-sets/${id}`,
+    data satisfies UpdateProblemSetRequest,
+  )
 }
 
 export function deleteProblemSet(id: number) {
@@ -600,15 +682,19 @@ export function getProblemSetProblems(problemSetId: number) {
 export function addProblemsToSet(problemSetId: number, problemIds: string[]) {
   return api.post<AddProblemsToSetResult>(`admin/problem-sets/${problemSetId}/problems`, {
     problemIds,
-  })
+  } satisfies AddProblemsToSetRequest)
 }
 
 export function setProblemRequired(problemSetId: number, itemId: number, isRequired: boolean) {
-  return api.put(`admin/problem-sets/${problemSetId}/problems/${itemId}`, { isRequired })
+  return api.put(`admin/problem-sets/${problemSetId}/problems/${itemId}`, {
+    isRequired,
+  } satisfies UpdateProblemInSetRequest)
 }
 
 export function reorderProblemSetProblems(problemSetId: number, ids: number[]) {
-  return api.put(`admin/problem-sets/${problemSetId}/problems/order`, { ids })
+  return api.put(`admin/problem-sets/${problemSetId}/problems/order`, {
+    ids,
+  } satisfies ReorderProblemSetProblemsRequest)
 }
 
 export function removeProblemFromSet(problemSetId: number, itemId: number) {
@@ -629,11 +715,17 @@ export interface BadgeBody {
 }
 
 export function createProblemSetBadge(problemSetId: number, data: BadgeBody) {
-  return api.post<AdminProblemSetBadge>(`admin/problem-sets/${problemSetId}/badges`, data)
+  return api.post<AdminProblemSetBadge>(
+    `admin/problem-sets/${problemSetId}/badges`,
+    data satisfies CreateProblemSetBadgeRequest,
+  )
 }
 
 export function editProblemSetBadge(problemSetId: number, badgeId: number, data: BadgeBody) {
-  return api.put<AdminProblemSetBadge>(`admin/problem-sets/${problemSetId}/badges/${badgeId}`, data)
+  return api.put<AdminProblemSetBadge>(
+    `admin/problem-sets/${problemSetId}/badges/${badgeId}`,
+    data satisfies UpdateProblemSetBadgeRequest,
+  )
 }
 
 export function deleteProblemSetBadge(problemSetId: number, badgeId: number) {
@@ -728,11 +820,17 @@ export function getMetricOptions() {
 }
 
 export function createAchievement(data: Partial<AdminAchievement>) {
-  return api.post<AdminAchievement>("admin/achievements", toAchievementBody(data))
+  return api.post<AdminAchievement>(
+    "admin/achievements",
+    toAchievementBody(data) satisfies Partial<CreateAchievementRequest>,
+  )
 }
 
 export function updateAchievement(data: Partial<AdminAchievement>) {
-  return api.put<AdminAchievement>(`admin/achievements/${data.id}`, toAchievementBody(data))
+  return api.put<AdminAchievement>(
+    `admin/achievements/${data.id}`,
+    toAchievementBody(data) satisfies Partial<UpdateAchievementRequest>,
+  )
 }
 
 export function deleteAchievement(id: number) {
diff --git a/apps/web/src/admin/user/generate.vue b/apps/web/src/admin/user/generate.vue
index cae8ff0..c304b90 100644
--- a/apps/web/src/admin/user/generate.vue
+++ b/apps/web/src/admin/user/generate.vue
@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import type { ImportUsersRequest } from "@oj2/contract"
 import { downloadAccountsCsv } from "./accountsCsv"
 import PageHeader from "admin/components/PageHeader.vue"
 import { classLabel } from "utils/classes"
@@ -127,7 +128,7 @@ async function submit() {
   // 占位邮箱必须全站唯一：注册、编辑用户、导入三条路都查重。每批一段随机后缀错开，
   // 同一个班分两批导也不会撞。这个地址不发给任何人，纯占位
   const batch = Math.random().toString(36).slice(2, 8)
-  const payload = rows.value.map((row, i) => [
+  const payload: ImportUsersRequest["users"] = rows.value.map((row, i) => [
     row.username,
     row.password,
     `${prefix.value || "user"}.${batch}.${i + 1}@example.com`,
diff --git a/apps/web/src/admin/user/list.vue b/apps/web/src/admin/user/list.vue
index 425b11e..3f6685b 100644
--- a/apps/web/src/admin/user/list.vue
+++ b/apps/web/src/admin/user/list.vue
@@ -13,7 +13,7 @@ import UserNameCell from "./components/UserNameCell.vue"
 import PasswordCell from "./components/PasswordCell.vue"
 import { PROBLEM_PERMISSION, USER_TYPE } from "utils/constants"
 import { useRouteQuery } from "@vueuse/router"
-import { NO_CLASS, STUDENT_ROLES } from "@oj2/contract"
+import { NO_CLASS, STUDENT_ROLES, type ImportUsersRequest } from "@oj2/contract"
 import { downloadAccountsCsv } from "./accountsCsv"
 import { classLabel, groupClassOptions } from "utils/classes"
 import { useConfigStore } from "shared/store/config"
@@ -338,7 +338,7 @@ async function handleEditUser() {
   // 其余业务错误（比如班级号位数不对）不接住就什么都不显示
   try {
     if (create.value) {
-      const newUser = [
+      const newUser: ImportUsersRequest["users"] = [
         [
           userEditing.value.username,
           password.value,
diff --git a/apps/web/src/oj/achievement/api.ts b/apps/web/src/oj/achievement/api.ts
index 9ed07db..2147975 100644
--- a/apps/web/src/oj/achievement/api.ts
+++ b/apps/web/src/oj/achievement/api.ts
@@ -1,3 +1,4 @@
+import type { MarkAchievementsRead } from "@oj2/contract"
 import api from "utils/api"
 import type { AchievementList, PendingAchievement } from "utils/types"
 
@@ -12,5 +13,5 @@ export function getPendingAchievements() {
 }
 
 export function markAchievementsRead(ids: number[]) {
-  return api.post("achievements/pending/read", { ids })
+  return api.post("achievements/pending/read", { ids } satisfies MarkAchievementsRead)
 }
diff --git a/apps/web/src/oj/api.ts b/apps/web/src/oj/api.ts
index 05842f5..17667e6 100644
--- a/apps/web/src/oj/api.ts
+++ b/apps/web/src/oj/api.ts
@@ -1,3 +1,14 @@
+import type {
+  ClassLessonRequest,
+  ContestPasswordRequest,
+  CreateFlowchartRequest,
+  CreateSubmissionRequest,
+  FormatCodeRequest,
+  JoinProblemSetRequest,
+  RankHiddenRequest,
+  SetReactionRequest,
+  UpdateProfileRequest,
+} from "@oj2/contract"
 import {
   type AiAnalysisRecord,
   type LearningPeriod,
@@ -144,21 +155,20 @@ export async function getSubmission(id: string, attempts = false): Promise<Submi
 }
 
 export function submitCode(data: SubmitCodePayload) {
-  return api.post<CreateSubmissionResponse>("submissions", data)
+  return api.post<CreateSubmissionResponse>("submissions", data satisfies CreateSubmissionRequest)
 }
 
-export function formatCode(data: { code: string; language: string; problemId: number }) {
-  const languages: Record<string, string> = {
-    Python: "python",
-    C: "c",
-    "C++": "cpp",
-    SQL: "sql",
-  }
+/** 后端格式化认的四种（ruff / clang-format / sqlparse），别的语言提交前不格式化 */
+export function isFormatLanguage(value: string): value is FormatCodeRequest["language"] {
+  return ["python", "c", "cpp", "sql"].includes(value)
+}
+
+export function formatCode(data: FormatCodeRequest & { problemId: number }) {
   return api.post<FormatCodeResponse>("code/format", {
     code: data.code,
-    language: languages[data.language] ?? data.language.toLowerCase(),
+    language: data.language,
     problemId: data.problemId,
-  })
+  } satisfies FormatCodeRequest)
 }
 
 export function getSubmissions(params: Partial<SubmissionListPayload>) {
@@ -262,7 +272,7 @@ export function getWeeklyChampions(className?: string) {
 
 /** 老师把学生设成不计入排名 / 恢复 */
 export function setRankHidden(userId: number, hidden: boolean) {
-  return api.put<null>(`rankings/hidden/${userId}`, { hidden })
+  return api.put<null>(`rankings/hidden/${userId}`, { hidden } satisfies RankHiddenRequest)
 }
 
 /** 老师清空一个学生的个性签名 */
@@ -294,7 +304,11 @@ export function setClassLesson(
   problemDisplayIds: string[],
   language: LessonLanguage | null,
 ) {
-  return api.put<null>("classroom/lesson", { className, problemDisplayIds, language })
+  return api.put<null>("classroom/lesson", {
+    className,
+    problemDisplayIds,
+    language,
+  } satisfies ClassLessonRequest)
 }
 
 /** 我的知识点地图（只有自己的，不能查别人） */
@@ -350,7 +364,7 @@ export function getContestAccess(id: string) {
 export function checkContestPassword(contestID: string, password: string) {
   return api.post<boolean>(`contests/${encodeURIComponent(contestID)}/access`, {
     password,
-  })
+  } satisfies ContestPasswordRequest)
 }
 
 export async function getContestProblems(contestID: string) {
@@ -375,7 +389,7 @@ export function uploadAvatar(file: File) {
 }
 
 export function updateProfile(data: { realName?: string; mood?: string }) {
-  return api.put<Profile>("me/profile", data)
+  return api.put<Profile>("me/profile", data satisfies UpdateProfileRequest)
 }
 
 export function getAnnouncementList(offset = 0, limit = 10) {
@@ -393,7 +407,9 @@ export function getReaction(problemID: number) {
 }
 
 export function setReaction(problemID: number, type: ReactionKey) {
-  return api.post<ReactionState>(`problems/${problemID}/reaction`, { type })
+  return api.post<ReactionState>(`problems/${problemID}/reaction`, {
+    type,
+  } satisfies SetReactionRequest)
 }
 
 /** 个人主页那一页的数据：做对的题、四个时间、本班第几、成就，本人和老师多拿知识点和没做对的题 */
@@ -450,7 +466,7 @@ export function submitFlowchart(data: {
   mermaidCode: string
   flowchartData: Record<string, unknown> // 压缩之后的，元数据太长了
 }) {
-  return api.post<CreateFlowchartResponse>("flowcharts", data)
+  return api.post<CreateFlowchartResponse>("flowcharts", data satisfies CreateFlowchartRequest)
 }
 
 export function getFlowchartSubmission(id: string) {
@@ -507,7 +523,7 @@ export function getProblemSetProblems(problemSetId: number) {
 }
 
 export function joinProblemSet(problemSetId: number) {
-  return api.post("problem-set-progress", { problemSetId })
+  return api.post("problem-set-progress", { problemSetId } satisfies JoinProblemSetRequest)
 }
 
 export function getUserBadges(username?: string) {
diff --git a/apps/web/src/oj/store/submission.ts b/apps/web/src/oj/store/submission.ts
index 72d1163..97425b1 100644
--- a/apps/web/src/oj/store/submission.ts
+++ b/apps/web/src/oj/store/submission.ts
@@ -1,6 +1,6 @@
 import { defineStore } from "pinia"
 import { errorCode, errorMessage } from "utils/api"
-import { formatCode, submitCode } from "oj/api"
+import { formatCode, isFormatLanguage, submitCode } from "oj/api"
 import { useCodeStore } from "oj/store/code"
 import { useProblemStore } from "oj/store/problem"
 import { useSubmissionMonitor } from "oj/problem/composables/useSubmissionMonitor"
@@ -106,7 +106,7 @@ export const useSubmissionStore = defineStore("submission", () => {
     //    Python 在格式化之前先由服务端的 CPython 查一遍语法，有错就不提交；
     //    C / C++ 先在判题机上编一遍，编不过就原样交（格式化会把错的几行并成一行）
     const formatLang = LANGUAGE_FORMAT_VALUE[codeStore.code.language]
-    if (["python", "c", "cpp", "sql"].includes(formatLang)) {
+    if (isFormatLanguage(formatLang)) {
       isFormatting.value = true
       try {
         const res = await formatCode({
diff --git a/apps/web/src/shared/api.ts b/apps/web/src/shared/api.ts
index 88518aa..89b7b16 100644
--- a/apps/web/src/shared/api.ts
+++ b/apps/web/src/shared/api.ts
@@ -1,14 +1,15 @@
+import type { LoginRequest, RegisterRequest } from "@oj2/contract"
 import type { Quote, WebsiteConfig } from "@oj2/contract"
 import api from "utils/api"
 import { contractDeferred } from "utils/contract"
 import type { Profile, Tag } from "utils/types"
 
 export function login(data: { username: string; password: string }) {
-  return api.post("auth/login", data)
+  return api.post("auth/login", data satisfies LoginRequest)
 }
 
 export function signup(data: { username: string; email: string; password: string }) {
-  return api.post("users", data)
+  return api.post("users", data satisfies RegisterRequest)
 }
 
 export function logout() {
diff --git a/packages/contract/src/account.ts b/packages/contract/src/account.ts
index 19491cc..b1c5238 100644
--- a/packages/contract/src/account.ts
+++ b/packages/contract/src/account.ts
@@ -71,8 +71,8 @@ export const problemRankSchema = z.object({
 
 export const publicProfileSchema = userProfileSchema
 
-export type RegisterRequest = z.infer<typeof registerRequestSchema>
-export type UpdateProfileRequest = z.infer<typeof updateProfileRequestSchema>
+export type RegisterRequest = z.input<typeof registerRequestSchema>
+export type UpdateProfileRequest = z.input<typeof updateProfileRequestSchema>
 export type ProblemRank = z.infer<typeof problemRankSchema>
 export type RankProfile = z.infer<typeof rankProfileSchema>
 export type WeeklyRankItem = z.infer<typeof weeklyRankItemSchema>
diff --git a/packages/contract/src/admin.ts b/packages/contract/src/admin.ts
index 0189723..32e66a0 100644
--- a/packages/contract/src/admin.ts
+++ b/packages/contract/src/admin.ts
@@ -1118,7 +1118,7 @@ export type AchievementMetric = z.infer<typeof achievementMetricSchema>
 export type AdminProblem = z.infer<typeof adminProblemSchema>
 export type AdminProblemListItem = z.infer<typeof adminProblemListItemSchema>
 export type AdminProblemList = z.infer<typeof adminProblemListSchema>
-export type CreateProblemRequest = z.infer<typeof createProblemRequestSchema>
+export type CreateProblemRequest = z.input<typeof createProblemRequestSchema>
 
 export type AdminContest = z.infer<typeof adminContestSchema>
 export type AdminContestList = z.infer<typeof adminContestListSchema>
@@ -1153,67 +1153,70 @@ export type BatchProblemTagResponse = z.infer<typeof batchProblemTagResponseSche
 export type SqlTestCaseScript = z.infer<typeof sqlTestCaseScriptSchema>
 export type GenerateSqlTestCaseResponse = z.infer<typeof generateSqlTestCaseResponseSchema>
 export type TestCaseFiles = z.infer<typeof testCaseFilesSchema>
-export type AstCheckRequest = z.infer<typeof astCheckRequestSchema>
+export type AstCheckRequest = z.input<typeof astCheckRequestSchema>
 export type AstCheckResponse = z.infer<typeof astCheckResponseSchema>
-export type GenerateTestInputsRequest = z.infer<typeof generateTestInputsRequestSchema>
+export type GenerateTestInputsRequest = z.input<typeof generateTestInputsRequestSchema>
 export type GenerateTestInputsResponse = z.infer<typeof generateTestInputsResponseSchema>
 
 export type AdminAnnouncementList = z.infer<typeof adminAnnouncementListSchema>
-export type CreateAnnouncementRequest = z.infer<typeof createAnnouncementRequestSchema>
-export type UpdateAnnouncementRequest = z.infer<typeof updateAnnouncementRequestSchema>
+export type CreateAnnouncementRequest = z.input<typeof createAnnouncementRequestSchema>
+export type UpdateAnnouncementRequest = z.input<typeof updateAnnouncementRequestSchema>
 export type TutorialType = z.infer<typeof tutorialTypeSchema>
 export type AdminTutorial = z.infer<typeof adminTutorialSchema>
 export type AdminTutorialListItem = z.infer<typeof adminTutorialListItemSchema>
 export type AdminTutorialGroups = z.infer<typeof adminTutorialGroupsSchema>
 export type AdminTutorialProblem = z.infer<typeof adminTutorialProblemSchema>
 export type TutorialProblemCandidate = z.infer<typeof tutorialProblemCandidateSchema>
-export type SetTutorialProblemsRequest = z.infer<typeof setTutorialProblemsRequestSchema>
-export type ReorderTutorialsRequest = z.infer<typeof reorderTutorialsRequestSchema>
-export type RenameTutorialProjectRequest = z.infer<typeof renameTutorialProjectRequestSchema>
-export type CreateTutorialRequest = z.infer<typeof createTutorialRequestSchema>
-export type UpdateTutorialRequest = z.infer<typeof updateTutorialRequestSchema>
-export type SetTutorialVisibilityRequest = z.infer<typeof setTutorialVisibilityRequestSchema>
+export type SetTutorialProblemsRequest = z.input<typeof setTutorialProblemsRequestSchema>
+export type ReorderTutorialsRequest = z.input<typeof reorderTutorialsRequestSchema>
+export type RenameTutorialProjectRequest = z.input<typeof renameTutorialProjectRequestSchema>
+export type CreateTutorialRequest = z.input<typeof createTutorialRequestSchema>
+export type UpdateTutorialRequest = z.input<typeof updateTutorialRequestSchema>
+export type SetTutorialVisibilityRequest = z.input<typeof setTutorialVisibilityRequestSchema>
 export type ExerciseType = z.infer<typeof exerciseTypeSchema>
 export type AdminExercise = z.infer<typeof adminExerciseSchema>
-export type CreateExerciseRequest = z.infer<typeof createExerciseRequestSchema>
-export type UpdateExerciseRequest = z.infer<typeof updateExerciseRequestSchema>
+export type CreateExerciseRequest = z.input<typeof createExerciseRequestSchema>
+export type UpdateExerciseRequest = z.input<typeof updateExerciseRequestSchema>
 export type ToggleAiReportPinResponse = z.infer<typeof toggleAiReportPinResponseSchema>
 export type AchievementOperator = z.infer<typeof achievementOperatorSchema>
-export type CreateAchievementRequest = z.infer<typeof createAchievementRequestSchema>
-export type UpdateAchievementRequest = z.infer<typeof updateAchievementRequestSchema>
-export type UpdateUserRequest = z.infer<typeof updateUserRequestSchema>
-export type ImportUsersRequest = z.infer<typeof importUsersRequestSchema>
-export type DeleteUsersRequest = z.infer<typeof deleteUsersRequestSchema>
+export type CreateAchievementRequest = z.input<typeof createAchievementRequestSchema>
+export type UpdateAchievementRequest = z.input<typeof updateAchievementRequestSchema>
+export type UpdateUserRequest = z.input<typeof updateUserRequestSchema>
+export type ImportUsersRequest = z.input<typeof importUsersRequestSchema>
+export type DeleteUsersRequest = z.input<typeof deleteUsersRequestSchema>
 export type ResetPasswordResponse = z.infer<typeof resetPasswordResponseSchema>
-export type UpdateWebsiteConfigRequest = z.infer<typeof updateWebsiteConfigRequestSchema>
-export type UpdateJudgeServerRequest = z.infer<typeof updateJudgeServerRequestSchema>
+export type UpdateWebsiteConfigRequest = z.input<typeof updateWebsiteConfigRequestSchema>
+export type UpdateJudgeServerRequest = z.input<typeof updateJudgeServerRequestSchema>
 export type UploadImageResponse = z.infer<typeof uploadImageResponseSchema>
-export type CreateContestRequest = z.infer<typeof createContestRequestSchema>
-export type UpdateContestRequest = z.infer<typeof updateContestRequestSchema>
-export type UpdateAcmHelperRequest = z.infer<typeof updateAcmHelperRequestSchema>
+export type CreateContestRequest = z.input<typeof createContestRequestSchema>
+export type UpdateContestRequest = z.input<typeof updateContestRequestSchema>
+export type UpdateAcmHelperRequest = z.input<typeof updateAcmHelperRequestSchema>
 export type AdminProblemSet = z.infer<typeof adminProblemSetSchema>
 export type AdminProblemSetList = z.infer<typeof adminProblemSetListSchema>
-export type CreateProblemSetRequest = z.infer<typeof createProblemSetRequestSchema>
-export type UpdateProblemSetRequest = z.infer<typeof updateProblemSetRequestSchema>
+export type CreateProblemSetRequest = z.input<typeof createProblemSetRequestSchema>
+export type UpdateProblemSetRequest = z.input<typeof updateProblemSetRequestSchema>
 export type AdminProblemSetProblem = z.infer<typeof adminProblemSetProblemSchema>
-export type AddProblemsToSetRequest = z.infer<typeof addProblemsToSetRequestSchema>
+export type AddProblemsToSetRequest = z.input<typeof addProblemsToSetRequestSchema>
 export type AddProblemsToSetResult = z.infer<typeof addProblemsToSetResultSchema>
-export type ReorderProblemSetProblemsRequest = z.infer<
+export type UpdateProblemInSetRequest = z.input<typeof updateProblemInSetRequestSchema>
+export type AdminProblemSetBadge = z.infer<typeof adminProblemSetBadgeSchema>
+export type CreateProblemSetBadgeRequest = z.input<typeof createProblemSetBadgeRequestSchema>
+export type UpdateProblemSetBadgeRequest = z.input<typeof updateProblemSetBadgeRequestSchema>
+export type RenameTagRequest = z.input<typeof renameTagRequestSchema>
+export type BatchProblemTagRequest = z.input<typeof batchProblemTagRequestSchema>
+export type BatchProblemVisibleRequest = z.input<typeof batchProblemVisibleRequestSchema>
+export type GenerateFlowchartRequest = z.input<typeof generateFlowchartRequestSchema>
+export type GenerateFlowchartResponse = z.infer<typeof generateFlowchartResponseSchema>
+export type UpdateProblemRequest = z.input<typeof updateProblemRequestSchema>
+export type MakeProblemPublicRequest = z.input<typeof makeProblemPublicRequestSchema>
+export type AddContestProblemRequest = z.input<typeof addContestProblemRequestSchema>
+export type ReorderContestProblemsRequest = z.input<typeof reorderContestProblemsRequestSchema>
+export type ReorderProblemSetProblemsRequest = z.input<
   typeof reorderProblemSetProblemsRequestSchema
 >
-export type UpdateProblemInSetRequest = z.infer<typeof updateProblemInSetRequestSchema>
-export type AdminProblemSetBadge = z.infer<typeof adminProblemSetBadgeSchema>
-export type CreateProblemSetBadgeRequest = z.infer<typeof createProblemSetBadgeRequestSchema>
-export type UpdateProblemSetBadgeRequest = z.infer<typeof updateProblemSetBadgeRequestSchema>
-export type RenameTagRequest = z.infer<typeof renameTagRequestSchema>
-export type BatchProblemTagRequest = z.infer<typeof batchProblemTagRequestSchema>
-export type BatchProblemVisibleRequest = z.infer<typeof batchProblemVisibleRequestSchema>
-export type GenerateFlowchartRequest = z.infer<typeof generateFlowchartRequestSchema>
-export type GenerateFlowchartResponse = z.infer<typeof generateFlowchartResponseSchema>
-export type UpdateProblemRequest = z.infer<typeof updateProblemRequestSchema>
-export type MakeProblemPublicRequest = z.infer<typeof makeProblemPublicRequestSchema>
-export type AddContestProblemRequest = z.infer<typeof addContestProblemRequestSchema>
+export type SetTagCategoryRequest = z.input<typeof setTagCategoryRequestSchema>
+export type CheckUsernamesRequest = z.input<typeof checkUsernamesRequestSchema>
 export type TestCaseEntry = z.infer<typeof testCaseEntrySchema>
 export type UploadTestCaseResponse = z.infer<typeof uploadTestCaseResponseSchema>
-export type SqlPreviewRequest = z.infer<typeof sqlPreviewRequestSchema>
-export type GenerateSqlTestCaseRequest = z.infer<typeof generateSqlTestCaseRequestSchema>
+export type SqlPreviewRequest = z.input<typeof sqlPreviewRequestSchema>
+export type GenerateSqlTestCaseRequest = z.input<typeof generateSqlTestCaseRequestSchema>
diff --git a/packages/contract/src/ai.ts b/packages/contract/src/ai.ts
index 5f4822f..2bfa66b 100644
--- a/packages/contract/src/ai.ts
+++ b/packages/contract/src/ai.ts
@@ -248,9 +248,9 @@ export type LearningDay = z.infer<typeof learningDaySchema>
 export type LearningReport = z.infer<typeof learningReportSchema>
 export type AiAnalysisRecord = z.infer<typeof aiAnalysisRecordSchema>
 
-export type AiAnalysisRequest = z.infer<typeof aiAnalysisRequestSchema>
-export type AiHintRequest = z.infer<typeof aiHintRequestSchema>
+export type AiAnalysisRequest = z.input<typeof aiAnalysisRequestSchema>
+export type AiHintRequest = z.input<typeof aiHintRequestSchema>
 export type AiHintDone = z.infer<typeof aiHintDoneSchema>
-export type AiHintFeedbackRequest = z.infer<typeof aiHintFeedbackRequestSchema>
-export type ClassAnalysisRequest = z.infer<typeof classAnalysisRequestSchema>
-export type ClassPkAnalysisRequest = z.infer<typeof classPkAnalysisRequestSchema>
+export type AiHintFeedbackRequest = z.input<typeof aiHintFeedbackRequestSchema>
+export type ClassAnalysisRequest = z.input<typeof classAnalysisRequestSchema>
+export type ClassPkAnalysisRequest = z.input<typeof classPkAnalysisRequestSchema>
diff --git a/packages/contract/src/auth.ts b/packages/contract/src/auth.ts
index efec0f1..537878e 100644
--- a/packages/contract/src/auth.ts
+++ b/packages/contract/src/auth.ts
@@ -28,6 +28,6 @@ export const userProfileSchema = z.object({
   submissionNumber: z.number().int(),
 })
 
-export type LoginRequest = z.infer<typeof loginRequestSchema>
+export type LoginRequest = z.input<typeof loginRequestSchema>
 export type SessionUser = z.infer<typeof sessionUserSchema>
 export type UserProfile = z.infer<typeof userProfileSchema>
diff --git a/packages/contract/src/classroom.ts b/packages/contract/src/classroom.ts
index fd997c0..fe49f52 100644
--- a/packages/contract/src/classroom.ts
+++ b/packages/contract/src/classroom.ts
@@ -225,7 +225,7 @@ export const classTodaySchema = z.object({
 export type ClassActivity = z.infer<typeof classActivitySchema>
 export type ClassToday = z.infer<typeof classTodaySchema>
 export type LastVisit = z.infer<typeof lastVisitSchema>
-export type ClassLessonRequest = z.infer<typeof classLessonRequestSchema>
+export type ClassLessonRequest = z.input<typeof classLessonRequestSchema>
 export type ClassBoard = z.infer<typeof classBoardSchema>
 export type ClassLesson = z.infer<typeof classLessonSchema>
 export type ClassBoardProblem = z.infer<typeof classBoardProblemSchema>
diff --git a/packages/contract/src/content.ts b/packages/contract/src/content.ts
index 60ea4d6..d6a9809 100644
--- a/packages/contract/src/content.ts
+++ b/packages/contract/src/content.ts
@@ -182,13 +182,13 @@ export type AnnouncementList = z.infer<typeof announcementListSchema>
 export type ReactionKey = z.infer<typeof reactionKeySchema>
 export type ReactionCounts = z.infer<typeof reactionCountsSchema>
 export type ReactionState = z.infer<typeof reactionStateSchema>
-export type SetReactionRequest = z.infer<typeof setReactionRequestSchema>
+export type SetReactionRequest = z.input<typeof setReactionRequestSchema>
 export type Tutorial = z.infer<typeof tutorialSchema>
 export type TutorialProblem = z.infer<typeof tutorialProblemSchema>
 export type Exercise = z.infer<typeof exerciseSchema>
 export type TutorialProgress = z.infer<typeof tutorialProgressSchema>
 export type TutorialProgressPing = z.infer<typeof tutorialProgressPingSchema>
-export type ExerciseAttemptRequest = z.infer<typeof exerciseAttemptRequestSchema>
+export type ExerciseAttemptRequest = z.input<typeof exerciseAttemptRequestSchema>
 
 /**
  * 「学完一课」的口径：**这课的练一练全做对**。没有练一练的课，打开过就算。
diff --git a/packages/contract/src/contest.ts b/packages/contract/src/contest.ts
index 325db06..d5c868f 100644
--- a/packages/contract/src/contest.ts
+++ b/packages/contract/src/contest.ts
@@ -152,5 +152,5 @@ export type ContestScoreboard = z.infer<typeof contestScoreboardSchema>
 export type ContestClassView = z.infer<typeof contestClassViewSchema>
 
 export type ContestStatus = z.infer<typeof contestStatusSchema>
-export type ContestPasswordRequest = z.infer<typeof contestPasswordRequestSchema>
+export type ContestPasswordRequest = z.input<typeof contestPasswordRequestSchema>
 export type ContestProblems = z.infer<typeof contestProblemsSchema>
diff --git a/packages/contract/src/flowchart.ts b/packages/contract/src/flowchart.ts
index 0f2edf1..9871d81 100644
--- a/packages/contract/src/flowchart.ts
+++ b/packages/contract/src/flowchart.ts
@@ -175,6 +175,6 @@ export type FlowchartListItem = z.infer<typeof flowchartListItemSchema>
 export type FlowchartList = z.infer<typeof flowchartListSchema>
 export type FlowchartScores = z.infer<typeof flowchartScoresSchema>
 export type CreateFlowchartResponse = z.infer<typeof createFlowchartResponseSchema>
-export type CreateFlowchartRequest = z.infer<typeof createFlowchartRequestSchema>
+export type CreateFlowchartRequest = z.input<typeof createFlowchartRequestSchema>
 
 export type FlowchartStatus = z.infer<typeof flowchartStatusSchema>
diff --git a/packages/contract/src/problemset.ts b/packages/contract/src/problemset.ts
index bc2cba0..2daed4c 100644
--- a/packages/contract/src/problemset.ts
+++ b/packages/contract/src/problemset.ts
@@ -164,4 +164,4 @@ export type UserBadge = z.infer<typeof userBadgeSchema>
 export type BadgeConditionType = z.infer<typeof badgeConditionTypeSchema>
 
 export type ProblemSetUserProgressSummary = z.infer<typeof problemSetUserProgressSummarySchema>
-export type JoinProblemSetRequest = z.infer<typeof joinProblemSetRequestSchema>
+export type JoinProblemSetRequest = z.input<typeof joinProblemSetRequestSchema>
diff --git a/packages/contract/src/ranking.ts b/packages/contract/src/ranking.ts
index d5b581d..5a3c494 100644
--- a/packages/contract/src/ranking.ts
+++ b/packages/contract/src/ranking.ts
@@ -118,7 +118,7 @@ export type RankTrend = z.infer<typeof rankTrendSchema>
 export type RankBoard = z.infer<typeof rankBoardSchema>
 export type ClassBattleItem = z.infer<typeof classBattleItemSchema>
 export type WeeklyChampion = z.infer<typeof weeklyChampionSchema>
-export type RankHiddenRequest = z.infer<typeof rankHiddenRequestSchema>
+export type RankHiddenRequest = z.input<typeof rankHiddenRequestSchema>
 
 /**
  * 班级详情（设计稿「班级详情 · 老师 / 学生」）。原来弹框里的四分位数、四分位距、标准差、
diff --git a/packages/contract/src/submission.ts b/packages/contract/src/submission.ts
index 8a48300..3d7d636 100644
--- a/packages/contract/src/submission.ts
+++ b/packages/contract/src/submission.ts
@@ -617,7 +617,7 @@ export type TrialRunResponse =
 
 export type StatisticInfo = z.infer<typeof statisticInfoSchema>
 export type SubmissionTrace = z.infer<typeof submissionTraceSchema>
-export type CreateSubmissionRequest = z.infer<typeof createSubmissionRequestSchema>
+export type CreateSubmissionRequest = z.input<typeof createSubmissionRequestSchema>
 export type SubmissionDetail = z.infer<typeof submissionDetailSchema>
 export type SubmissionUpdate = z.infer<typeof submissionUpdateSchema>
 export type SubmissionStatistics = z.infer<typeof submissionStatisticsSchema>
@@ -633,5 +633,5 @@ export type SubmissionList = z.infer<typeof submissionListSchema>
 export type CreateSubmissionResponse = z.infer<typeof createSubmissionResponseSchema>
 export type FormatCodeResponse = z.infer<typeof formatCodeResponseSchema>
 
-export type FormatCodeRequest = z.infer<typeof formatCodeRequestSchema>
-export type TrialRunRequest = z.infer<typeof trialRunRequestSchema>
+export type FormatCodeRequest = z.input<typeof formatCodeRequestSchema>
+export type TrialRunRequest = z.input<typeof trialRunRequestSchema>