• End-to-end typesafe APIs made easy
• The exhaustive Pattern Matching library for TypeScript, with smart type inference
• zap Pattern Matching in Typescript
• Generate Algebraic Data Types and pattern matchers
• Runtime type system for IO decoding/encoding
  • A collection of codecs and combinators for use with io-ts
• Generate typescript interface definitions from SQL database schema
• TS Docs | Reference docs for npm packages

Serializing/Deserializing - Transform

• https://github.com/dkzlv/micro-transform
• superjson: Safely serialize JavaScript expressions to a superset of JSON, which includes Dates, BigInts, and more.

Runtime Parsing / (de)serializers

• GitHub - moltar/typescript-runtime-type-benchmarks: 📊 Benchmark Comparison of Packages with Runtime Validation and TypeScript Support
• lang.typescript.lib.zod
• A typesafe validation & parsing library for TypeScript
• Small, efficient and extendable runtype library for Typescript
• Runtime validation for static types
• Function argument validation for humans
• GitHub - sandulat/routes-gen: Framework agnostic CLI tool for routes parsing and generation of a type-safe helper for safe route usage. 🗺️ Remix driver included. 💿🤟
• GitHub - fp-ts/schema
• GitHub - arktypeio/arktype: TypeScript's 1:1 validator, optimized from editor to runtime]
• effect/packages/schema at main · Effect-TS/effect

Error Handling

• Type-Safe Errors for JS & TypeScript
• Very lightweight library with no dependencies to handle errors in a typed way
• Simple type-safe errors for TypeScript

Checker

• GitHub - dudykr/stc: Speedy TypeScript type checker