@rajatasusual/json-schema-2-ts NPM

@rajatasusual/json-schema-2-ts

Forked from https://github.com/bcherny/@rajatasusual/json-schema-2-ts

Compile json schema to typescript class

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

Installation

# Using Yarn:
yarn add @rajatasusual/json-schema-2-ts

# Or, using NPM:
npm install @rajatasusual/json-schema-2-ts --save

Usage

import { compile, compileFromFile } from 'json-schema-2-ts'

// 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 => ...)

Options

compileFromFile and compile accept options as their last argument (all keys are optional):

key	type	default	description
additionalProperties	boolean	`true`	Default value for `additionalProperties`, when it is not explicitly set
bannerComment	string	`"/* eslint-disable /\n/\n This file was automatically generated by @rajatasusual/json-schema-2-ts.\n* DO NOT MODIFY IT BY HAND. Instead, modify the source JSONSchema file,\n* and run @rajatasusual/json-schema-2-ts to regenerate this file.\n*/"`	Disclaimer comment prepended to the top of each generated file
cwd	string	`process.cwd()`	Root directory for resolving `$ref`s
declareExternallyReferenced	boolean	`true`	Declare external schemas referenced via `$ref`?
enableConstEnums	boolean	`true`	Prepend enums with `const`?
format	boolean	`true`	Format code? Set this to `false` to improve performance.
ignoreMinAndMaxItems	boolean	`false`	Ignore maxItems and minItems for `array` types, preventing tuples being generated.
maxItems	number	`20`	Maximum number of unioned tuples to emit when representing bounded-size array types, before falling back to emitting unbounded arrays. Increase this to improve precision of emitted types, decrease it to improve performance, or set it to `-1` to ignore `maxItems`.
strictIndexSignatures	boolean	`false`	Append all index signatures with `\\| undefined` so that they are strictly typed.
style	object	`{ 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	`{}`	$RefParser Options, used when resolving `$ref`s

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 class name
infer unnamed class name from filename
deprecated
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

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

@rajatasusual/json-schema-2-ts is crashing on my giant file. What can I do?

Prettier is known to run slowly on really big files. To skip formatting and improve performance, set the format option to false.

@rajatasusual/json-schema-2-ts v13.1.2-7