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TypeScript

TypeScript type utilities and generators

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TypeScript types, schemas, and conversions

TypeScript tools cover the type-system gaps where typing is mostly mechanical: JSON-to-TypeScript with options for arrays, unions, and optional fields; TypeScript-to-Zod converters for runtime validation; Zod schema generators from sample data; tsconfig.json validators that catch the common module-resolution misconfigs; utility-type playgrounds (Pick, Omit, Partial, ReturnType, etc.). Useful both during initial typing of a third-party API response and during refactors when you need to invert the relationship — say, generating a Zod schema *from* the existing TypeScript type so runtime checks line up with compile-time guarantees.

13 tools

Discriminated Union Generator

Build a tagged union and get the type, per-variant guards, an exhaustive switch, factories and a match() helper — live

Open Discriminated Union Generator

Enum to Union Converter

Convert a TS enum to a tree-shakeable const-object + union (or literal union / values array / mapping), with footgun notes

Open Enum to Union Converter

Generic Type Builder

Build generic interfaces, mapped & conditional types and generic functions with constraints/defaults — plus a live usage example

Open Generic Type Builder

Type Guard Generator

Generate recursive runtime type guards (and assertion functions) from a TS interface, with a live validator that tests any JSON value

Open Type Guard Generator

Type Assertion Converter

Convert assertions between as / angle-bracket / satisfies and analyze code for risky casts (as any, double assertions) with safer fixes

Open Type Assertion Converter

Type Narrowing Helper

Type a union and get idiomatic narrowing (typeof, in, instanceof, Array.isArray, discriminant switch) + a pattern reference

Open Type Narrowing Helper

Interface Merger

Merge multiple interfaces (merged / intersection / extends / deep) with conflict detection and keep-first/last/union resolution

Open Interface Merger

Utility Type Helper

A searchable reference + live generator for every built-in utility type, each with a worked example and its from-scratch implementation

Open Utility Type Helper

React Props Type Generator

Infer React prop types from pasted JSX (or build them by hand) and emit a props interface, function component, React.FC or forwardRef

Open React Props Type Generator

Zod Schema Generator

Smart JSON-to-Zod: merges array samples for optional/nullable/enum/format inference, emits the z.infer type, and validates any payload live

Open Zod Schema Generator

JSON Schema Generator

Generate a JSON Schema (Draft 2020-12 / draft-07) from a JSON sample with array-merge required-key, enum & format inference + a live validator

Open JSON Schema Generator

JSDoc to Markdown

Turn JSDoc comments into Markdown API docs — params table, returns, throws, examples, badges, optional TOC — for functions, classes & typedefs

Open JSDoc to Markdown

JSON Schema ⇄ Zod Converter

Convert JSON Schema to Zod and back — with strict mode for OpenAI/Anthropic structured outputs and function calling

Open JSON Schema ⇄ Zod Converter