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json-schema-to-typescript

Compile JSONSchema to TypeScript typings

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Compile json schema to typescript typings

Example

Input:

{
  "title": "Example Schema",
  "type": "object",
  "properties": {
    "firstName": {
      "type": "string"
    },
    "lastName": {
      "type": "string"
    },
    "age": {
      "description": "Age in years",
      "type": "integer",
      "minimum": 0
    },
    "hairColor": {
      "enum": ["black", "brown", "blue"],
      "type": "string"
    }
  },
  "additionalProperties": false,
  "required": ["firstName", "lastName"]
}

Output:

export interface ExampleSchema {
  firstName: string;
  lastName: string;
  /**
   * Age in years
   */
  age?: number;
  hairColor?: "black", "brown", "blue";
}

Installation

# Using Yarn:
yarn add json-schema-to-typescript

# Or, using NPM:
npm install json-schema-to-typescript --save

Usage

import { compile, compileFromFile } from 'json-schema-to-typescript'

// compile from file
compileFromFile('foo.json')
  .then(ts => fs.writeFileSync('foo.d.ts', ts))

// or, compile a JS object
let mySchema = {
  properties: [...]
}
compile(mySchema, 'MySchema')
  .then(ts => ...)

See server demo and browser demo for full examples.

Options

compileFromFile and compile accept options as their last argument (all keys are optional):, key, type, default, description, -, -, -, -, bannerComment, string, "/* tslint:disable */\n/**\n* This file was automatically generated by json-schema-to-typescript.\n* DO NOT MODIFY IT BY HAND. Instead, modify the source JSONSchema file,\n* and run json-schema-to-typescript to regenerate this file.\n*/", Disclaimer comment prepended to the top of each generated file, cwd, string, process.cwd(), Root directory for resolving $refs, declareExternallyReferenced, boolean, true, Declare external schemas referenced via $ref?, enableConstEnums, boolean, true, Prepend enums with const?, style, object, { bracketSpacing: false, printWidth: 120, semi: true, singleQuote: false, tabWidth: 2, trailingComma: 'none', useTabs: false }, A Prettier configuration, unreachableDefinitions, boolean, false, Generates code for definitions that aren't referenced by the schema., strictIndexSignatures, boolean, false, Append all index signatures with , undefined so that they are strictly typed., $refOptions, object, {}, $RefParser Options, used when resolving $refs, ## CLI

A simple CLI utility is provided with this package.

cat foo.json, json2ts > foo.d.ts
# or
json2ts foo.json > foo.d.ts
# or
json2ts foo.json foo.d.ts
# or
json2ts --input foo.json --output foo.d.ts
# or
json2ts -i foo.json -o foo.d.ts

You can pass any of the options described above (including style options) as CLI flags. Boolean values can be set to false using the no- prefix.

# generate code for definitions that aren't referenced
json2ts -i foo.json -o foo.d.ts --unreachableDefinitions
# use single quotes and disable trailing semicolons
json2ts -i foo.json -o foo.d.ts --style.singleQuote --no-style.semi

Tests

npm test

Features

  • title => interface
  • Primitive types:
    • array
    • homogeneous array
    • boolean
    • integer
    • number
    • null
    • object
    • string
    • homogeneous enum
    • heterogeneous enum
  • Non/extensible interfaces
  • Custom JSON-schema extensions
  • Nested properties
  • Schema definitions
  • Schema references
  • Local (filesystem) schema references
  • External (network) schema references
  • Add support for running in browser
  • default interface name
  • infer unnamed interface name from filename
  • allOf ("intersection")
  • anyOf ("union")
  • oneOf (treated like anyOf)
  • maxItems (eg)
  • minItems (eg)
  • additionalProperties of type
  • patternProperties (partial support)
  • extends
  • required properties on objects (eg)
  • validateRequired (eg)
  • literal objects in enum (eg)
  • referencing schema by id (eg)
  • custom typescript types via tsType

Not expressible in TypeScript:

Further Reading

Projects That Use JSON-Schema-to-TypeScript

Main metrics

Overview
Name With Ownerbcherny/json-schema-to-typescript
Primary LanguageTypeScript
Program languageTypeScript (Language Count: 2)
Platform
License:MIT License
所有者活动
Created At2016-03-22 03:56:58
Pushed At2025-09-25 21:34:05
Last Commit At2025-05-19 09:31:39
Release Count3
Last Release Namev1.2.2 (Posted on )
First Release Namev0.1.0 (Posted on )
用户参与
Stargazers Count3.2k
Watchers Count17
Fork Count424
Commits Count593
Has Issues Enabled
Issues Count429
Issue Open Count154
Pull Requests Count98
Pull Requests Open Count25
Pull Requests Close Count114
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