README

transform-json-types

An utility to generate Flow, TypeScript, Rust Serde Struct and Scala Case Class from JSON.

Note : It also detects optional properties for TS/Flow from a Collection.

Installation

npm install transform-json-types

The online REPL is available at

Basic Usage

import transform from "transform-json-types"

const json = `{
  "hello": "world"
}`

console.log(transform(json, {
  lang: "typescript"
}))

// interface RootJson {
//   hello: string
// }

console.log(transform(json, {
    lang: "rust-serde"
}))

// #[derive(Serialize, Deserialize)]
// struct RootInterface {
//   hello: String,
// }

Usage with sarcastic and Flow

//@flow
import is, { type AssertionType } from "sarcastic"

// Interface generated by "transform-json-types"
const PersonInterface = is.shape({
  name: is.string,
  age: is.number
});

// Use it like this:
type Person = AssertionType<typeof PersonInterface>
const assertPerson = (val: mixed): Person =>
  is(val, PersonInterface, "Person")
const person = assertPerson(JSON.parse('{"name":"Giulio","age":43}')))

Usage with io-ts and TypeScript

import * as t from "io-ts"

// Interface generated by "transform-json-types"
const PersonInterface = t.type({
  name: t.string,
  age: t.number
});

// Use it like this:
PersonInterface.decode(JSON.parse('{"name":"Giulio","age":43}')) // => Right({name: "Giulio", age: 43})
PersonInterface.decode(JSON.parse('{"name":"Giulio"}')) // => Left([...])
type Person = t.TypeOf<typeof Person>