TypeScript libraries

Zod is a TypeScript-first schema declaration and validation library. One schema produces both the runtime check and the static type, so the two can never drift apart.

Valibot is a schema validation library with an API similar to Zod's but built around tree-shakeable functions, producing dramatically smaller client bundles.

TypeBox builds JSON Schema objects that also carry TypeScript types, so one definition serves runtime validation, static typing and OpenAPI documentation.

tRPC gives you end-to-end type safety between a TypeScript server and client with no code generation, no schema files and no build step.

Prisma is a next-generation ORM with a declarative schema, generated type-safe client, and a migration system that produces reviewable SQL.

Drizzle is a TypeScript ORM whose query builder mirrors SQL closely, with no code generation step and a very small runtime suitable for serverless and edge environments.

Kysely is a type-safe SQL query builder for TypeScript. It is not an ORM — you write SQL structure, and the types follow your database schema exactly.

NestJS is a structured Node.js framework built on TypeScript decorators, with dependency injection, modules and a strong architectural convention.

ts-pattern brings exhaustive pattern matching to TypeScript, with full type narrowing and a compile-time guarantee that every case is handled.

neverthrow provides a Result type for TypeScript, making failure part of a function's return type instead of an invisible exception.

typescript-eslint lets ESLint parse and lint TypeScript, including rules that use full type information to catch bugs a syntax-only linter cannot see.

tsx runs TypeScript files directly with no build step, using esbuild for near-instant transpilation. It is the modern replacement for ts-node.

tsup bundles TypeScript libraries with almost no configuration, producing ESM and CommonJS output plus declaration files in one command.

type-fest is a collection of essential TypeScript utility types that the standard library does not include, from deep partials to JSON value types.

class-validator validates objects using decorators on class properties, and is the validation layer built into NestJS.

tsyringe is a lightweight dependency injection container for TypeScript from Microsoft, using decorators and constructor injection.

openapi-typescript generates TypeScript types from an OpenAPI schema, giving a typed client for an API you do not control.

SuperJSON serialises JavaScript values that JSON cannot represent — Date, Map, Set, BigInt, undefined and RegExp — and restores them on the other side.

ts-morph wraps the TypeScript compiler API in a navigable, mutable object model, making programmatic code analysis and refactoring practical.

TypeDoc generates API documentation directly from TypeScript source and TSDoc comments, using the type information rather than parsing comments alone.

Effect is a library for building typed, composable programs where errors, dependencies and asynchrony all appear in the type signature.

fp-ts brings typed functional programming to TypeScript, with Option, Either, Task and the type-class hierarchy those structures come from.

TypeORM is a decorator-based ORM for TypeScript supporting both Active Record and Data Mapper patterns, with migrations, relations and a query builder.

MikroORM is a TypeScript ORM built on the Data Mapper, Unit of Work and Identity Map patterns, tracking entity changes and flushing them in one transaction.

InversifyJS is a full-featured inversion of control container for TypeScript, with decorators, scopes, tagged bindings and middleware.

ts-jest is a Jest transformer that runs TypeScript tests with full type checking during the test run.

io-ts provides runtime type validation built on fp-ts, representing decoding failures as an Either rather than by throwing.

tsd tests your TypeScript type definitions, asserting that types resolve as intended and that invalid usage is correctly rejected.