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JSON to TypeScript

Developer Tools

Generate interfaces from JSON

Quick Answer

JSON to TypeScript: Generate interfaces from JSON. JSON to TypeScript uses standard developer formulas to compute accurate results instantly.

JSON

TypeScript

export interface ApiResponse {
  code: number;
  message: string;
  data: Data;
}

export interface Users {
  id: number;
  name: string;
  email?: string;
  vip: boolean;
  tags: string[] | any[];
}

export interface Meta {
  page: number;
  size: number;
  hasMore: boolean;
}

export interface Data {
  total: number;
  users: Users[];
  meta: Meta;
}

Processing steps

  1. 1JSON parsed, walking the object tree and inferring primitive types
  2. 2Array items merged: missing keys → optional (?), differing types → union (|)
  3. 3Generated 4 interface(s), 14 fields total
Inference rules: null → any (indistinguishable from missing data); empty array → any[]; array objects merge into one interface with optional fields; numbers are all `number` (no int/float split). Review generated types before production use — add branded types, string enums and precise nullability as needed.

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How to Use

  1. Paste or type content: drop code/text into the JSON to TypeScript or fill the parameters.
  2. Choose mode/options: switch format, rules or processing as needed.
  3. Live output: results appear instantly — nothing is submitted, data stays in your browser.
  4. One-click copy: copy the output straight into your development environment.

Key Points

  • JSON to TypeScript is a free online developer tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Generate interfaces from JSON.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

JSON to TypeScript formula

JSON to TypeScript uses standard developer formulas to compute accurate results instantly.

FAQ

How do I use the JSON to TypeScript?
Open the page and fill in the input fields — results update automatically. Generate interfaces from JSON.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on RFC 4648, ECMA-262 and related specifications. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. JSON to TypeScript[EB/OL]. https://www.yijiansuan.com/en/c/dev/json-to-ts

Results provided by this tool are for reference only and do not constitute professional advice.