diff --git a/packages/backend/src/core/chart/charts/entities/active-users.ts b/packages/backend/src/core/chart/charts/entities/active-users.ts
index e291e37c1b..1c630f2095 100644
--- a/packages/backend/src/core/chart/charts/entities/active-users.ts
+++ b/packages/backend/src/core/chart/charts/entities/active-users.ts
@@ -1,17 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'activeUsers';
-
-export const schema = {
-	'readWrite': { intersection: ['read', 'write'] },
-	'read': { uniqueIncrement: true },
-	'write': { uniqueIncrement: true },
-	'registeredWithinWeek': { uniqueIncrement: true },
-	'registeredWithinMonth': { uniqueIncrement: true },
-	'registeredWithinYear': { uniqueIncrement: true },
-	'registeredOutsideWeek': { uniqueIncrement: true },
-	'registeredOutsideMonth': { uniqueIncrement: true },
-	'registeredOutsideYear': { uniqueIncrement: true },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/active-users.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema);
diff --git a/packages/backend/src/core/chart/charts/entities/ap-request.ts b/packages/backend/src/core/chart/charts/entities/ap-request.ts
index 3a9f3dacfd..1e92592358 100644
--- a/packages/backend/src/core/chart/charts/entities/ap-request.ts
+++ b/packages/backend/src/core/chart/charts/entities/ap-request.ts
@@ -1,11 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'apRequest';
-
-export const schema = {
-	'deliverFailed': { },
-	'deliverSucceeded': { },
-	'inboxReceived': { },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/ap-request.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema);
diff --git a/packages/backend/src/core/chart/charts/entities/drive.ts b/packages/backend/src/core/chart/charts/entities/drive.ts
index 4bf5bb729e..2050dba142 100644
--- a/packages/backend/src/core/chart/charts/entities/drive.ts
+++ b/packages/backend/src/core/chart/charts/entities/drive.ts
@@ -1,16 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'drive';
-
-export const schema = {
-	'local.incCount': {},
-	'local.incSize': {}, // in kilobyte
-	'local.decCount': {},
-	'local.decSize': {}, // in kilobyte
-	'remote.incCount': {},
-	'remote.incSize': {}, // in kilobyte
-	'remote.decCount': {},
-	'remote.decSize': {}, // in kilobyte
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/drive.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema);
diff --git a/packages/backend/src/core/chart/charts/entities/federation.ts b/packages/backend/src/core/chart/charts/entities/federation.ts
index a8466b0b4c..ec71804825 100644
--- a/packages/backend/src/core/chart/charts/entities/federation.ts
+++ b/packages/backend/src/core/chart/charts/entities/federation.ts
@@ -1,16 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'federation';
-
-export const schema = {
-	'deliveredInstances': { uniqueIncrement: true, range: 'small' },
-	'inboxInstances': { uniqueIncrement: true, range: 'small' },
-	'stalled': { uniqueIncrement: true, range: 'small' },
-	'sub': { accumulate: true, range: 'small' },
-	'pub': { accumulate: true, range: 'small' },
-	'pubsub': { accumulate: true, range: 'small' },
-	'subActive': { accumulate: true, range: 'small' },
-	'pubActive': { accumulate: true, range: 'small' },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/federation.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema);
diff --git a/packages/backend/src/core/chart/charts/entities/instance.ts b/packages/backend/src/core/chart/charts/entities/instance.ts
index 06962120e2..32d47dc67f 100644
--- a/packages/backend/src/core/chart/charts/entities/instance.ts
+++ b/packages/backend/src/core/chart/charts/entities/instance.ts
@@ -1,32 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'instance';
-
-export const schema = {
-	'requests.failed': { range: 'small' },
-	'requests.succeeded': { range: 'small' },
-	'requests.received': { range: 'small' },
-	'notes.total': { accumulate: true },
-	'notes.inc': {},
-	'notes.dec': {},
-	'notes.diffs.normal': {},
-	'notes.diffs.reply': {},
-	'notes.diffs.renote': {},
-	'notes.diffs.withFile': {},
-	'users.total': { accumulate: true },
-	'users.inc': { range: 'small' },
-	'users.dec': { range: 'small' },
-	'following.total': { accumulate: true },
-	'following.inc': { range: 'small' },
-	'following.dec': { range: 'small' },
-	'followers.total': { accumulate: true },
-	'followers.inc': { range: 'small' },
-	'followers.dec': { range: 'small' },
-	'drive.totalFiles': { accumulate: true },
-	'drive.incFiles': {},
-	'drive.decFiles': {},
-	'drive.incUsage': {}, // in kilobyte
-	'drive.decUsage': {}, // in kilobyte
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/instance.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema, true);
diff --git a/packages/backend/src/core/chart/charts/entities/notes.ts b/packages/backend/src/core/chart/charts/entities/notes.ts
index 9387dbfb2c..1dc1daeeee 100644
--- a/packages/backend/src/core/chart/charts/entities/notes.ts
+++ b/packages/backend/src/core/chart/charts/entities/notes.ts
@@ -1,22 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'notes';
-
-export const schema = {
-	'local.total': { accumulate: true },
-	'local.inc': {},
-	'local.dec': {},
-	'local.diffs.normal': {},
-	'local.diffs.reply': {},
-	'local.diffs.renote': {},
-	'local.diffs.withFile': {},
-	'remote.total': { accumulate: true },
-	'remote.inc': {},
-	'remote.dec': {},
-	'remote.diffs.normal': {},
-	'remote.diffs.reply': {},
-	'remote.diffs.renote': {},
-	'remote.diffs.withFile': {},
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/notes.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema);
diff --git a/packages/backend/src/core/chart/charts/entities/per-user-drive.ts b/packages/backend/src/core/chart/charts/entities/per-user-drive.ts
index 6111640ea0..735d83291b 100644
--- a/packages/backend/src/core/chart/charts/entities/per-user-drive.ts
+++ b/packages/backend/src/core/chart/charts/entities/per-user-drive.ts
@@ -1,14 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'perUserDrive';
-
-export const schema = {
-	'totalCount': { accumulate: true },
-	'totalSize': { accumulate: true }, // in kilobyte
-	'incCount': { range: 'small' },
-	'incSize': {}, // in kilobyte
-	'decCount': { range: 'small' },
-	'decSize': {}, // in kilobyte
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/per-user-drive.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema, true);
diff --git a/packages/backend/src/core/chart/charts/entities/per-user-following.ts b/packages/backend/src/core/chart/charts/entities/per-user-following.ts
index 4118daa474..accedb56b9 100644
--- a/packages/backend/src/core/chart/charts/entities/per-user-following.ts
+++ b/packages/backend/src/core/chart/charts/entities/per-user-following.ts
@@ -1,20 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'perUserFollowing';
-
-export const schema = {
-	'local.followings.total': { accumulate: true },
-	'local.followings.inc': { range: 'small' },
-	'local.followings.dec': { range: 'small' },
-	'local.followers.total': { accumulate: true },
-	'local.followers.inc': { range: 'small' },
-	'local.followers.dec': { range: 'small' },
-	'remote.followings.total': { accumulate: true },
-	'remote.followings.inc': { range: 'small' },
-	'remote.followings.dec': { range: 'small' },
-	'remote.followers.total': { accumulate: true },
-	'remote.followers.inc': { range: 'small' },
-	'remote.followers.dec': { range: 'small' },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/per-user-following.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema, true);
diff --git a/packages/backend/src/core/chart/charts/entities/per-user-notes.ts b/packages/backend/src/core/chart/charts/entities/per-user-notes.ts
index c1fa174452..23057fb924 100644
--- a/packages/backend/src/core/chart/charts/entities/per-user-notes.ts
+++ b/packages/backend/src/core/chart/charts/entities/per-user-notes.ts
@@ -1,15 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'perUserNotes';
-
-export const schema = {
-	'total': { accumulate: true },
-	'inc': { range: 'small' },
-	'dec': { range: 'small' },
-	'diffs.normal': { range: 'small' },
-	'diffs.reply': { range: 'small' },
-	'diffs.renote': { range: 'small' },
-	'diffs.withFile': { range: 'small' },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/per-user-notes.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema, true);
diff --git a/packages/backend/src/core/chart/charts/entities/per-user-pv.ts b/packages/backend/src/core/chart/charts/entities/per-user-pv.ts
index 64c8ed1fb1..2d8717c815 100644
--- a/packages/backend/src/core/chart/charts/entities/per-user-pv.ts
+++ b/packages/backend/src/core/chart/charts/entities/per-user-pv.ts
@@ -1,12 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'perUserPv';
-
-export const schema = {
-	'upv.user': { uniqueIncrement: true, range: 'small' },
-	'pv.user': { range: 'small' },
-	'upv.visitor': { uniqueIncrement: true, range: 'small' },
-	'pv.visitor': { range: 'small' },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/per-user-pv.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema, true);
diff --git a/packages/backend/src/core/chart/charts/entities/per-user-reactions.ts b/packages/backend/src/core/chart/charts/entities/per-user-reactions.ts
index 5e1a6c7b30..5f1f50993e 100644
--- a/packages/backend/src/core/chart/charts/entities/per-user-reactions.ts
+++ b/packages/backend/src/core/chart/charts/entities/per-user-reactions.ts
@@ -1,10 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'perUserReaction';
-
-export const schema = {
-	'local.count': { range: 'small' },
-	'remote.count': { range: 'small' },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/per-user-reactions.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema, true);
diff --git a/packages/backend/src/core/chart/charts/entities/test-grouped.ts b/packages/backend/src/core/chart/charts/entities/test-grouped.ts
index 66b6e8e864..059047d1af 100644
--- a/packages/backend/src/core/chart/charts/entities/test-grouped.ts
+++ b/packages/backend/src/core/chart/charts/entities/test-grouped.ts
@@ -1,11 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'testGrouped';
-
-export const schema = {
-	'foo.total': { accumulate: true },
-	'foo.inc': {},
-	'foo.dec': {},
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/test-grouped.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema, true);
diff --git a/packages/backend/src/core/chart/charts/entities/test-intersection.ts b/packages/backend/src/core/chart/charts/entities/test-intersection.ts
index a3bdcb367f..c9b0756c4a 100644
--- a/packages/backend/src/core/chart/charts/entities/test-intersection.ts
+++ b/packages/backend/src/core/chart/charts/entities/test-intersection.ts
@@ -1,11 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'testIntersection';
-
-export const schema = {
-	'a': { uniqueIncrement: true },
-	'b': { uniqueIncrement: true },
-	'aAndB': { intersection: ['a', 'b'] },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/test-intersection.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema);
diff --git a/packages/backend/src/core/chart/charts/entities/test-unique.ts b/packages/backend/src/core/chart/charts/entities/test-unique.ts
index b2cfb71b05..26c838c15f 100644
--- a/packages/backend/src/core/chart/charts/entities/test-unique.ts
+++ b/packages/backend/src/core/chart/charts/entities/test-unique.ts
@@ -1,9 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'testUnique';
-
-export const schema = {
-	'foo': { uniqueIncrement: true },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/test-unique.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema);
diff --git a/packages/backend/src/core/chart/charts/entities/test.ts b/packages/backend/src/core/chart/charts/entities/test.ts
index 7cba21e16a..9731796b3a 100644
--- a/packages/backend/src/core/chart/charts/entities/test.ts
+++ b/packages/backend/src/core/chart/charts/entities/test.ts
@@ -1,11 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'test';
-
-export const schema = {
-	'foo.total': { accumulate: true },
-	'foo.inc': {},
-	'foo.dec': {},
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/test.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema);
diff --git a/packages/backend/src/core/chart/charts/entities/users.ts b/packages/backend/src/core/chart/charts/entities/users.ts
index c0b83094ae..1c8e664825 100644
--- a/packages/backend/src/core/chart/charts/entities/users.ts
+++ b/packages/backend/src/core/chart/charts/entities/users.ts
@@ -1,14 +1,7 @@
 import Chart from '../../core.js';
 
-export const name = 'users';
-
-export const schema = {
-	'local.total': { accumulate: true },
-	'local.inc': { range: 'small' },
-	'local.dec': { range: 'small' },
-	'remote.total': { accumulate: true },
-	'remote.inc': { range: 'small' },
-	'remote.dec': { range: 'small' },
-} as const;
+import * as _ from 'misskey-js/built/schemas/charts/users.js';
+export const name = _.name;
+export const schema = _.schema;
 
 export const entity = Chart.schemaToEntity(name, schema);
diff --git a/packages/backend/src/core/chart/core.ts b/packages/backend/src/core/chart/core.ts
index d352adcc1f..57faa0eb84 100644
--- a/packages/backend/src/core/chart/core.ts
+++ b/packages/backend/src/core/chart/core.ts
@@ -10,22 +10,12 @@ import { dateUTC, isTimeSame, isTimeBefore, subtractTime, addTime } from '@/misc
 import type Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
 import type { Repository, DataSource } from 'typeorm';
+import type { ChartSchema as Schema, ChartResult, Unflatten } from 'misskey-js/built/schemas';
 
 const COLUMN_PREFIX = '___' as const;
 const UNIQUE_TEMP_COLUMN_PREFIX = 'unique_temp___' as const;
 const COLUMN_DELIMITER = '_' as const;
 
-type Schema = Record<string, {
-	uniqueIncrement?: boolean;
-
-	intersection?: string[] | ReadonlyArray<string>;
-
-	range?: 'big' | 'small' | 'medium';
-
-	// previousな値を引き継ぐかどうか
-	accumulate?: boolean;
-}>;
-
 type KeyToColumnName<T extends string> = T extends `${infer R1}.${infer R2}` ? `${R1}${typeof COLUMN_DELIMITER}${KeyToColumnName<R2>}` : T;
 
 type Columns<S extends Schema> = {
@@ -64,47 +54,6 @@ export type KVs<S extends Schema> = {
 	[K in keyof S]: number;
 };
 
-type ChartResult<T extends Schema> = {
-	[P in keyof T]: number[];
-};
-
-type UnionToIntersection<T> = (T extends any ? (x: T) => any : never) extends (x: infer R) => any ? R : never;
-
-type UnflattenSingleton<K extends string, V> = K extends `${infer A}.${infer B}`
-	? { [_ in A]: UnflattenSingleton<B, V>; }
-	: { [_ in K]: V; };
-
-type Unflatten<T extends Record<string, any>> = UnionToIntersection<
-	{
-		[K in Extract<keyof T, string>]: UnflattenSingleton<K, T[K]>;
-	}[Extract<keyof T, string>]
->;
-
-type ToJsonSchema<S> = {
-	type: 'object';
-	properties: {
-		[K in keyof S]: S[K] extends number[] ? { type: 'array'; items: { type: 'number'; }; } : ToJsonSchema<S[K]>;
-	},
-	required: (keyof S)[];
-};
-
-export function getJsonSchema<S extends Schema>(schema: S): ToJsonSchema<Unflatten<ChartResult<S>>> {
-	const jsonSchema = {
-		type: 'object',
-		properties: {} as Record<string, unknown>,
-		required: [],
-	};
-
-	for (const k in schema) {
-		jsonSchema.properties[k] = {
-			type: 'array',
-			items: { type: 'number' },
-		};
-	}
-
-	return jsonSchema as ToJsonSchema<Unflatten<ChartResult<S>>>;
-}
-
 /**
  * 様々なチャートの管理を司るクラス
  */
diff --git a/packages/backend/src/server/api/endpoints/charts/user/drive.ts b/packages/backend/src/server/api/endpoints/charts/user/drive.ts
index 5e372294b7..66dff34d59 100644
--- a/packages/backend/src/server/api/endpoints/charts/user/drive.ts
+++ b/packages/backend/src/server/api/endpoints/charts/user/drive.ts
@@ -1,36 +1,15 @@
 import { Injectable } from '@nestjs/common';
-import { getJsonSchema } from '@/core/chart/core.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import PerUserDriveChart from '@/core/chart/charts/per-user-drive.js';
-import { schema } from '@/core/chart/charts/entities/per-user-drive.js';
-
-export const meta = {
-	tags: ['charts', 'drive', 'users'],
-
-	res: getJsonSchema(schema),
-
-	allowGet: true,
-	cacheSec: 60 * 60,
-} as const;
-
-export const paramDef = {
-	type: 'object',
-	properties: {
-		span: { type: 'string', enum: ['day', 'hour'] },
-		limit: { type: 'integer', minimum: 1, maximum: 500, default: 30 },
-		offset: { type: 'integer', nullable: true, default: null },
-		userId: { type: 'string', format: 'misskey:id' },
-	},
-	required: ['span', 'userId'],
-} as const;
 
 // eslint-disable-next-line import/no-default-export
 @Injectable()
-export default class extends Endpoint<typeof meta, typeof paramDef> {
+export default class extends Endpoint<'charts/user/drive'> {
+	name = 'charts/user/drive' as const;
 	constructor(
 		private perUserDriveChart: PerUserDriveChart,
 	) {
-		super(meta, paramDef, async (ps, me) => {
+		super(async (ps, me) => {
 			return await this.perUserDriveChart.getChart(ps.span, ps.limit, ps.offset ? new Date(ps.offset) : null, ps.userId);
 		});
 	}
diff --git a/packages/misskey-js/src/endpoints.ts b/packages/misskey-js/src/endpoints.ts
index 1933a00490..219bff64f9 100644
--- a/packages/misskey-js/src/endpoints.ts
+++ b/packages/misskey-js/src/endpoints.ts
@@ -2,6 +2,9 @@ import type { JSONSchema7 } from 'schema-type';
 import { IEndpointMeta } from './endpoints.types';
 import { localUsernameSchema, passwordSchema } from './schemas/user';
 import ms from 'ms';
+import { getJsonSchema } from './schemas';
+import * as perUserDriveChartSchema from './schemas/charts/per-user-drive';
+import * as driveChartSchema from './schemas/charts/drive';
 
 export const endpoints = {
 	//#region admin
@@ -2984,6 +2987,29 @@ export const endpoints = {
 		}],
 	},
 	//#endregion
+
+	//#region charts
+	'charts/user/drive': {
+		tags: ['charts', 'drive', 'users'],
+
+		allowGet: true,
+		cacheSec: 60 * 60,
+
+		defines: [{
+			req: {
+				type: 'object',
+				properties: {
+					span: { type: 'string', enum: ['day', 'hour'] },
+					limit: { type: 'integer', minimum: 1, maximum: 500, default: 30 },
+					offset: { type: 'integer', nullable: true, default: null },
+					userId: { type: 'string', format: 'misskey:id' },
+				},
+				required: ['span', 'userId'],
+			},
+			res: getJsonSchema(perUserDriveChartSchema.schema) satisfies JSONSchema7,
+		}],
+	},
+	//#endregion
 } as const satisfies { [x: string]: IEndpointMeta; };
 
 /**
diff --git a/packages/misskey-js/src/schemas.ts b/packages/misskey-js/src/schemas.ts
index 83272bb3de..efd507dbee 100644
--- a/packages/misskey-js/src/schemas.ts
+++ b/packages/misskey-js/src/schemas.ts
@@ -58,7 +58,7 @@ import {
 import { packedModerationLogSchema } from './schemas/moderation-log.js';
 import { packedAuthSessionSchema } from './schemas/auth-session.js';
 import { Error, ApiError } from './schemas/error.js';
-import type { JSONSchema7, JSONSchema7Definition, GetDef, GetRefs, GetKeys, UnionToArray, Serialized } from 'schema-type';
+import type { JSONSchema7, JSONSchema7Definition, GetDef, GetRefs, GetKeys, UnionToArray, Serialized, Projected } from 'schema-type';
 
 export const refs = {
 	Id: IdSchema,
@@ -120,3 +120,57 @@ export type References = GetRefs<typeof refs>;
 
 export type Packed<x extends GetKeys<References, 'https://misskey-hub.net/api/schemas/'>> = Serialized<GetDef<References, x, false, 'https://misskey-hub.net/api/schemas/'>>;
 export type Def<x extends GetKeys<References>> = GetDef<References, x>;
+
+//#reginon Chart
+export type ChartSchema = Record<string, {
+	uniqueIncrement?: boolean;
+
+	intersection?: string[] | ReadonlyArray<string>;
+
+	range?: 'big' | 'small' | 'medium';
+
+	// previousな値を引き継ぐかどうか
+	accumulate?: boolean;
+}>;
+
+export type ChartResult<T extends ChartSchema> = {
+	[P in keyof T]: number[];
+};
+
+type UnionToIntersection<T> = (T extends any ? (x: T) => any : never) extends (x: infer R) => any ? R : never;
+
+type UnflattenSingleton<K extends string, V> = K extends `${infer A}.${infer B}`
+	? { [_ in A]: UnflattenSingleton<B, V>; }
+	: { [_ in K]: V; };
+
+export type Unflatten<T extends Record<string, any>> = Projected<UnionToIntersection<
+	{
+		[K in Extract<keyof T, string>]: UnflattenSingleton<K, T[K]>;
+	}[Extract<keyof T, string>]
+>>;
+
+type ToJsonSchema<S> = {
+	type: 'object';
+	properties: {
+		[K in keyof S]: S[K] extends number[] ? { type: 'array'; items: { type: 'number'; }; } : ToJsonSchema<S[K]>;
+	},
+	required: (keyof S)[];
+};
+
+export function getJsonSchema<S extends ChartSchema>(schema: S): ToJsonSchema<Unflatten<ChartResult<S>>> {
+	const jsonSchema = {
+		type: 'object',
+		properties: {} as Record<string, unknown>,
+		required: [],
+	};
+
+	for (const k in schema) {
+		jsonSchema.properties[k] = {
+			type: 'array',
+			items: { type: 'number' },
+		};
+	}
+
+	return jsonSchema as ToJsonSchema<Unflatten<ChartResult<S>>>;
+}
+//#endregion
diff --git a/packages/misskey-js/src/schemas/charts/active-users.ts b/packages/misskey-js/src/schemas/charts/active-users.ts
new file mode 100644
index 0000000000..b4c0df5ce9
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/active-users.ts
@@ -0,0 +1,13 @@
+export const name = 'activeUsers';
+
+export const schema = {
+	'readWrite': { intersection: ['read', 'write'] },
+	'read': { uniqueIncrement: true },
+	'write': { uniqueIncrement: true },
+	'registeredWithinWeek': { uniqueIncrement: true },
+	'registeredWithinMonth': { uniqueIncrement: true },
+	'registeredWithinYear': { uniqueIncrement: true },
+	'registeredOutsideWeek': { uniqueIncrement: true },
+	'registeredOutsideMonth': { uniqueIncrement: true },
+	'registeredOutsideYear': { uniqueIncrement: true },
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/ap-request.ts b/packages/misskey-js/src/schemas/charts/ap-request.ts
new file mode 100644
index 0000000000..77e81b9b58
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/ap-request.ts
@@ -0,0 +1,7 @@
+export const name = 'apRequest';
+
+export const schema = {
+	'deliverFailed': { },
+	'deliverSucceeded': { },
+	'inboxReceived': { },
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/drive.ts b/packages/misskey-js/src/schemas/charts/drive.ts
new file mode 100644
index 0000000000..ade3fae7d0
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/drive.ts
@@ -0,0 +1,12 @@
+export const name = 'drive';
+
+export const schema = {
+	'local.incCount': {},
+	'local.incSize': {}, // in kilobyte
+	'local.decCount': {},
+	'local.decSize': {}, // in kilobyte
+	'remote.incCount': {},
+	'remote.incSize': {}, // in kilobyte
+	'remote.decCount': {},
+	'remote.decSize': {}, // in kilobyte
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/federation.ts b/packages/misskey-js/src/schemas/charts/federation.ts
new file mode 100644
index 0000000000..bd720b41b2
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/federation.ts
@@ -0,0 +1,12 @@
+export const name = 'federation';
+
+export const schema = {
+	'deliveredInstances': { uniqueIncrement: true, range: 'small' },
+	'inboxInstances': { uniqueIncrement: true, range: 'small' },
+	'stalled': { uniqueIncrement: true, range: 'small' },
+	'sub': { accumulate: true, range: 'small' },
+	'pub': { accumulate: true, range: 'small' },
+	'pubsub': { accumulate: true, range: 'small' },
+	'subActive': { accumulate: true, range: 'small' },
+	'pubActive': { accumulate: true, range: 'small' },
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/instance.ts b/packages/misskey-js/src/schemas/charts/instance.ts
new file mode 100644
index 0000000000..06c3dda0e4
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/instance.ts
@@ -0,0 +1,28 @@
+export const name = 'instance';
+
+export const schema = {
+	'requests.failed': { range: 'small' },
+	'requests.succeeded': { range: 'small' },
+	'requests.received': { range: 'small' },
+	'notes.total': { accumulate: true },
+	'notes.inc': {},
+	'notes.dec': {},
+	'notes.diffs.normal': {},
+	'notes.diffs.reply': {},
+	'notes.diffs.renote': {},
+	'notes.diffs.withFile': {},
+	'users.total': { accumulate: true },
+	'users.inc': { range: 'small' },
+	'users.dec': { range: 'small' },
+	'following.total': { accumulate: true },
+	'following.inc': { range: 'small' },
+	'following.dec': { range: 'small' },
+	'followers.total': { accumulate: true },
+	'followers.inc': { range: 'small' },
+	'followers.dec': { range: 'small' },
+	'drive.totalFiles': { accumulate: true },
+	'drive.incFiles': {},
+	'drive.decFiles': {},
+	'drive.incUsage': {}, // in kilobyte
+	'drive.decUsage': {}, // in kilobyte
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/notes.ts b/packages/misskey-js/src/schemas/charts/notes.ts
new file mode 100644
index 0000000000..3df1d12249
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/notes.ts
@@ -0,0 +1,18 @@
+export const name = 'notes';
+
+export const schema = {
+	'local.total': { accumulate: true },
+	'local.inc': {},
+	'local.dec': {},
+	'local.diffs.normal': {},
+	'local.diffs.reply': {},
+	'local.diffs.renote': {},
+	'local.diffs.withFile': {},
+	'remote.total': { accumulate: true },
+	'remote.inc': {},
+	'remote.dec': {},
+	'remote.diffs.normal': {},
+	'remote.diffs.reply': {},
+	'remote.diffs.renote': {},
+	'remote.diffs.withFile': {},
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/per-user-drive.ts b/packages/misskey-js/src/schemas/charts/per-user-drive.ts
new file mode 100644
index 0000000000..ea2c67c1fb
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/per-user-drive.ts
@@ -0,0 +1,10 @@
+export const name = 'perUserDrive';
+
+export const schema = {
+	'totalCount': { accumulate: true },
+	'totalSize': { accumulate: true }, // in kilobyte
+	'incCount': { range: 'small' },
+	'incSize': {}, // in kilobyte
+	'decCount': { range: 'small' },
+	'decSize': {}, // in kilobyte
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/per-user-following.ts b/packages/misskey-js/src/schemas/charts/per-user-following.ts
new file mode 100644
index 0000000000..56d80c43f9
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/per-user-following.ts
@@ -0,0 +1,16 @@
+export const name = 'perUserFollowing';
+
+export const schema = {
+	'local.followings.total': { accumulate: true },
+	'local.followings.inc': { range: 'small' },
+	'local.followings.dec': { range: 'small' },
+	'local.followers.total': { accumulate: true },
+	'local.followers.inc': { range: 'small' },
+	'local.followers.dec': { range: 'small' },
+	'remote.followings.total': { accumulate: true },
+	'remote.followings.inc': { range: 'small' },
+	'remote.followings.dec': { range: 'small' },
+	'remote.followers.total': { accumulate: true },
+	'remote.followers.inc': { range: 'small' },
+	'remote.followers.dec': { range: 'small' },
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/per-user-notes.ts b/packages/misskey-js/src/schemas/charts/per-user-notes.ts
new file mode 100644
index 0000000000..cd51b70812
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/per-user-notes.ts
@@ -0,0 +1,11 @@
+export const name = 'perUserNotes';
+
+export const schema = {
+	'total': { accumulate: true },
+	'inc': { range: 'small' },
+	'dec': { range: 'small' },
+	'diffs.normal': { range: 'small' },
+	'diffs.reply': { range: 'small' },
+	'diffs.renote': { range: 'small' },
+	'diffs.withFile': { range: 'small' },
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/per-user-pv.ts b/packages/misskey-js/src/schemas/charts/per-user-pv.ts
new file mode 100644
index 0000000000..929307d4fe
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/per-user-pv.ts
@@ -0,0 +1,8 @@
+export const name = 'perUserPv';
+
+export const schema = {
+	'upv.user': { uniqueIncrement: true, range: 'small' },
+	'pv.user': { range: 'small' },
+	'upv.visitor': { uniqueIncrement: true, range: 'small' },
+	'pv.visitor': { range: 'small' },
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/per-user-reactions.ts b/packages/misskey-js/src/schemas/charts/per-user-reactions.ts
new file mode 100644
index 0000000000..a8b9c8923f
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/per-user-reactions.ts
@@ -0,0 +1,6 @@
+export const name = 'perUserReaction';
+
+export const schema = {
+	'local.count': { range: 'small' },
+	'remote.count': { range: 'small' },
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/test-grouped.ts b/packages/misskey-js/src/schemas/charts/test-grouped.ts
new file mode 100644
index 0000000000..659a728afd
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/test-grouped.ts
@@ -0,0 +1,7 @@
+export const name = 'testGrouped';
+
+export const schema = {
+	'foo.total': { accumulate: true },
+	'foo.inc': {},
+	'foo.dec': {},
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/test-intersection.ts b/packages/misskey-js/src/schemas/charts/test-intersection.ts
new file mode 100644
index 0000000000..2eb34d0ddf
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/test-intersection.ts
@@ -0,0 +1,7 @@
+export const name = 'testIntersection';
+
+export const schema = {
+	'a': { uniqueIncrement: true },
+	'b': { uniqueIncrement: true },
+	'aAndB': { intersection: ['a', 'b'] },
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/test-unique.ts b/packages/misskey-js/src/schemas/charts/test-unique.ts
new file mode 100644
index 0000000000..7c90413caf
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/test-unique.ts
@@ -0,0 +1,5 @@
+export const name = 'testUnique';
+
+export const schema = {
+	'foo': { uniqueIncrement: true },
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/test.ts b/packages/misskey-js/src/schemas/charts/test.ts
new file mode 100644
index 0000000000..5e196108ef
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/test.ts
@@ -0,0 +1,7 @@
+export const name = 'test';
+
+export const schema = {
+	'foo.total': { accumulate: true },
+	'foo.inc': {},
+	'foo.dec': {},
+} as const;
diff --git a/packages/misskey-js/src/schemas/charts/users.ts b/packages/misskey-js/src/schemas/charts/users.ts
new file mode 100644
index 0000000000..f96462c35d
--- /dev/null
+++ b/packages/misskey-js/src/schemas/charts/users.ts
@@ -0,0 +1,10 @@
+export const name = 'users';
+
+export const schema = {
+	'local.total': { accumulate: true },
+	'local.inc': { range: 'small' },
+	'local.dec': { range: 'small' },
+	'remote.total': { accumulate: true },
+	'remote.inc': { range: 'small' },
+	'remote.dec': { range: 'small' },
+} as const;