@apployees/json-schema-to-typescript

Fork of bcherny/json-schema-to-typescript targeting browser only. Removed all cli, node, and file-system dependencies.

json-schema-to-typescript

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 } from 'json-schema-to-typescript'

// 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
declareExternallyReferenced	boolean	true	Declare external schemas referenced via $ref?
enableConstEnums	boolean	true	Prepend enums with const?
ignoreMinAndMaxItems	boolean	false	Ignore maxItems and minItems for array types, preventing tuples being generated.
unknownAny	boolean	true	Use unknown instead of any where possible
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

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] 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)

Further Reading

• JSON-schema spec: https://tools.ietf.org/html/draft-zyp-json-schema-04
• JSON-schema wiki: https://github.com/json-schema/json-schema/wiki
• JSON-schema test suite: https://github.com/json-schema/JSON-Schema-Test-Suite/blob/node
• TypeScript spec: https://github.com/Microsoft/TypeScript/blob/master/doc/spec.md

Who uses JSON-Schema-to-TypeScript?

• AWS, AWSLabs
• FormatJS
• Microsoft
• Sourcegraph
• Stryker
• Webpack
• See more