json-schema-to-typescript

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json-schema-to-typescript !Build Status build !npm !mit !node

Compile JSONSchema to TypeScript typings.

Example

Check out the live demo.
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

npm install json-schema-to-typescript

Usage

json-schema-to-typescript is easy to use via the CLI, or programmatically.

CLI

A CLI utility is provided with this package.

cat foo.json | json2ts > foo.d.ts
# or
json2ts foo.json > foo.d.ts
# or
json2ts foo.yaml foo.d.ts
# or
json2ts --input foo.json --output foo.d.ts
# or
json2ts -i foo.json -o foo.d.ts
# or (quote globs so that your shell doesn't expand them)
json2ts -i 'schemas/**/*.json'
# or
json2ts -i schemas/ -o types/

You can pass any of the options described below (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

API

To invoke json-schema-to-typescript from your TypeScript or JavaScript program, import it and call compile or compileFromFile.

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

"/* eslint-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*/"

{ bracketSpacing: false,  printWidth: 120,  semi: true,  singleQuote: false,  tabWidth: 2,  trailingComma: 'none',  useTabs: false }

| A Prettier configuration | | unknownAny | boolean | true | Use unknown instead of any where possible | | unreachableDefinitions | boolean | false | Generates code for $defs that aren't referenced by the schema. | | $refOptions | object | {} | $RefParser Options, used when resolving $refs |

Tests

$ npm test

Features

x title => interface
x Primitive types:

- x array - x homogeneous array - x boolean - x integer - x number - x null - x object - x string - x homogeneous enum - x heterogeneous enum

x Non/extensible interfaces
Custom JSON-schema extensions
x Nested properties
x Schema definitions
x Schema references
x Local (filesystem) schema references
x External (network) schema references
x Add support for running in browser
x default interface name
x infer unnamed interface name from filename
x deprecated
x allOf ("intersection")
x anyOf ("union")
x oneOf (treated like anyOf)
x maxItems (eg)
x minItems (eg)
x additionalProperties of type
x patternProperties (partial support)
x extends
x required properties on objects (eg)
validateRequired (eg)
x literal objects in enum (eg)
x referencing schema by id (eg)
x custom typescript types via tsType

Custom schema properties:

tsType: Overrides the type that's generated from the schema. Useful for forcing a type to any or when using non-standard JSON schema extensions (eg).
tsEnumNames: Overrides the names used for the elements in an enum. Can also be used to create string enums (eg).

Not expressible in TypeScript:

dependencies (single, multiple)
divisibleBy (eg)
format (eg)
multipleOf (eg)
maximum (eg)
minimum (eg)
maxProperties (eg)
minProperties (eg)
not/disallow
oneOf ("xor", use anyOf instead)
pattern (string, regex)
uniqueItems (eg)

FAQ