Popular
JSON Schema
Standard vocabulary for describing and validating JSON data
Design and SDKsStandard for JSON validation
Alternatives to Joi
12 tools like Joi, chosen by what they do. About Joi
Open source
Scalar
Hosted API docs, typed SDKs and MCP servers from an OpenAPI file
Design and SDKsModern OpenAPI docs and client
Freemium
Fern
Generate SDKs, API docs and a CLI from an OpenAPI spec
Design and SDKsSDKs and docs from your API
Open source
TypeSpec
Code-first language to define APIs and emit OpenAPI or JSON Schema
Design and SDKsDesign APIs with code
Freemium
Apiary
Hosted platform to design, prototype, document and test APIs
Design and SDKsAPI design and docs platform
Open source
OpenAPI Generator
Generates API clients, server stubs and docs from OpenAPI
Design and SDKsGenerate clients from OpenAPI
Curated
Bump.sh
Hosted API docs and MCP servers, built from your OpenAPI spec
Design and SDKsAPI docs with changelogs
Open source
AsyncAPI
Open source specification and tools for event-driven APIs
Design and SDKsSpec for event driven APIs
Open source
Zod
TypeScript-first schema validation with static type inference
API DesignTypeScript schema validation
Open source
Open source
ArkType
TypeScript-style validators that check data at runtime
ORMs and ValidationTypeScript-native validation
Open source
Valibot
Modular TypeScript schema library for validating unknown data
ORMs and ValidationModular schema validation