@cappasityinc/json-schema-to-typescript
compile json schema to typescript typings
Last updated 8 months ago by avvs .
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json-schema-to-typescript Build Status npm mit

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 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

  • [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

Not expressible in TypeScript:

Further Reading

Projects That Use JSON-Schema-to-TypeScript

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