Deprecated

typescript-json has been renamed to typia

Typia

// RUNTIME VALIDATORS
export function is<T>(input: unknown | T): input is T; // returns boolean
export function assert<T>(input: unknown | T): T; // throws TypeGuardError
export function validate<T>(input: unknown | T): IValidation<T>; // detailed

// STRICT VALIDATORS
export function equals<T>(input: unknown | T): input is T;
export function assertEquals<T>(input: unknown | T): T;
export function validateEquals<T>(input: unknown | T): IValidation<T>;

// JSON
export function application<T>(): IJsonApplication; // JSON schema
export function assertParse<T>(input: string): T; // type safe parser
export function assertStringify<T>(input: T): string; // safe and faster
    // +) isParse, validateParse 
    // +) stringify, isStringify, validateStringify

// MISC
export function random<T>(): Primitive<T>; // generate random data
export function clone<T>(input: T): Primitive<T>; // deep clone
export function prune<T extends object>(input: T): void; // erase extra props
    // +) isClone, assertClone, validateClone
    // +) isPrune, assertPrune, validatePrune

typia is a transformer library of TypeScript, supporting below features:

• Super-fast Runtime Validators
• Safe JSON parse and fast stringify functions
• JSON schema generator
• Random data generator

All functions in typia require only one line. You don't need any extra dedication like JSON schema definitions or decorator function calls. Just call typia function with only one line like typia.assert<T>(input).

Also, as typia performs AOT (Ahead of Time) compilation skill, its performance is much faster than other competitive libaries. For an example, when comparing validate function is() with other competitive libraries, typia is maximum 15,000x times faster than class-validator.

Measured on Intel i5-1135g7, Surface Pro 8

Sponsors and Backers

Thanks for your support.

Your donation would encourage typia development.

Setup

Setup Wizard

npx typia setup

Just type npx typia setup, that's all.

If you've installed ttypescript during setup, you should compile typia utilization code through ttsc command, instead of tsc.

# COMPILE THROUGH TTYPESCRIPT
npx ttsc

# RUN TS-NODE WITH TTYPESCRIPT
npx ts-node -C ttypescript src/index.ts

Otherwise, you've chosen ts-patch, you can use original tsc command. However, ts-patch hacks node_modules/typescript source code. Also, whenever update typescript version, you've to run npm run prepare command repeatedly.

By the way, when using @nest/cli, you must just choose ts-patch

# USE ORIGINAL TSC COMMAND
tsc
npx ts-node src/index.ts

# WHENVER UPDATE
npm install --save-dev typescript@latest
npm run prepare

Manual Setup

If you want to install and setup typia manually, read Guide Documents - Setup.

• Setup Wizard
• NPM Packages
• tsconfig.json
• vite
• webpack

Vite

When you want to setup typia on your frontend project with vite, just configure vite.config.ts like below.

Also, don't forget running Setup Wizard before.

If you've chosen ts-patch compiler, just call only typescript() function.

import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
import typescript from "@rollup/plugin-typescript";
import ttsc from "ttypescript";

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    react(),
    // when using "ttypescript"
    typescript({
      typescript: ttsc,
    }),
    // otherwise using "ts-patch"
    typescript()
  ]
});

Features

In here README documents, only summarized informations are provided.

For more details, refer to the Guide Documents (wiki).

• Runtime Validators
  • powerful validator
  • is() function
  • assert() function
  • validate() function
  • strict validators
  • factory functions
  • comment tags
• Enhanced JSON
  • JSON schema
  • parse() functions
  • stringify() functions
  • comment tags
• Miscellaneous
  • random() function
  • clone() functions
  • prune() functions

Runtime Validators

// ALLOW SUPERFLUOUS PROPERTIES
export function is<T>(input: T | unknown): input is T; // returns boolean
export function assert<T>(input: T | unknown): T; // throws `TypeGuardError`
export function validate<T>(input: T | unknown): IValidation<T>; // detailed

// DO NOT ALLOW SUPERFLUOUS PROPERTIES
export function equals<T>(input: T | unknown): input is T;
export function assertEquals<T>(input: T | unknown): T;
export function validateEquals<T>(input: T | unknown): IValidation<T>;

// REUSABLE FACTORY FUNCTIONS
export function createIs<T>(): (input: unknown) => input is T;
export function createAssert<T>(): (input: unknown) => T;
export function createValidate<T>(): (input: unknown) => IValidation<T>;
export function createEquals<T>(): (input: unknown) => input is T;
export function createAssertEquals<T>(): (input: unknown) => T;
export function createValidateEquals<T>(): (input: unknown) => IValidation<T>;

typia supports three type of validator functions:

• is(): returns false if not matched with the type T
• assert(): throws a TypeGuardError when not matched
• validate()
  • when matched, returns IValidation.ISuccess<T> with value property
  • when not matched, returns IValidation.IFailure with errors property

Also, if you want more strict validator functions that even do not allowing superfluous properties not written in the type T, you can use those functions instead; equals(), assertEquals(), validateEquals(). Otherwise you want to create resuable validator functions, you can utilize factory functions like createIs() instead.

When you want to add special validation logics, like limiting range of numeric values, you can do it through comment tags. If you want to know about it, visit the Guide Documents (Features > Runtime Validators > Comment Tags).

Enhanced JSON

// JSON SCHEMA GENERATOR
export function application<
    Types extends unknown[],
    Purpose extends "swagger" | "ajv" = "swagger",
    Prefix extends string = Purpose extends "swagger"
        ? "#/components/schemas"
        : "components#/schemas",
>(): IJsonApplication;

// SAFE PARSER FUNCTIONS
export function isParse<T>(input: string): T | null;
export function assertParse<T>(input: string): T;
export function validateParse<T>(input: string): IValidation<T>;

// FASTER STRINGIFY FUNCTIONS
export function stringify<T>(input: T): string; // unsafe
export function isStringify<T>(input: T): string | null; // safe
export function assertStringify<T>(input: T): string;
export function validateStringify<T>(input: T): IValidation<string>;

// FACTORY FUNCTIONS
export function createAssertParse<T>(): (input: string) => T;
export function createAssertStringify<T>(): (input: T) => string;
    // +) createIsParse, createValidateParse
    // +) createStringify, createIsStringify, createValidateStringify

typia supports enhanced JSON functions.

• application(): generate JSON schema with only one line
  • you can complement JSON schema contents through comment tags
• assertParse(): parse JSON string safely with type validation
• isStringify(): maximum 10x faster JSON stringify fuction even type safe

Measured on AMD R7 6800HS

Miscellaneous

export function random<T>(): Primitive<T>; // random data generator
export function clone<T>(input: T): Primitive<T>; // deep copy
export function prune<T>(input: T): void; // remove superfluous properties

When you need test data, just generate it through typia.random<T>().

If a little bit special data being required, use (Features > Runtime Validators > Comment Tags)

Appendix

Nestia

Nestia is a set of helper libraries for NestJS, supporting below features:

• @nestia/core: 15,000x times faster validation decorators
• @nestia/sdk: evolved SDK and Swagger generators
  • SDK (Software Development Kit)
    • interaction library for client developers
    • almost same with tRPC
• nestia: just CLI (command line interface) tool

Reactia

Not published yet, but soon

Reactia is an automatic React components generator, just by analyzing TypeScript type.

• @reactia/core: Core Library analyzing TypeScript type
• @reactia/mui: Material UI Theme for core and nest
• @reactia/nest: Automatic Frontend Application Builder for NestJS

When you want to automate an individual component, just use @reactia/core.

import ReactDOM from "react-dom";

import typia from "typia";
import { ReactiaComponent } from "@reactia/core";
import { MuiInputTheme } from "@reactia/mui";

const RequestInput = ReactiaComponent<IRequestDto>(MuiInputTheme());
const input: IRequestDto = { ... };

ReactDOM.render(
    <RequestInput input={input} />,
    document.body
);

Otherwise, you can fully automate frontend application development through @reactia/nest.

import React from "react";
import ReactDOM from "react-dom";

import { ISwagger } "@nestia/swagger";
import { MuiApplicationTheme } from "@reactia/mui";
import { ReactiaApplication } from "@reactia/nest";

const swagger: ISwagger = await import("./swagger.json");
const App: React.FC = ReactiaApplication(MuiApplicationTheme())(swagger);

ReactDOM.render(
    <App />,
    document.body
);