Validate incoming data
Check forms, API payloads, and configuration against explicit schemas.
Options for this task
ArkType
Library / toolA runtime validator with TypeScript-like schema syntax.
- Good for
- Validating external data while keeping schema definitions close to static types.
io-ts
Library / toolA runtime type system for decoding and encoding data.
- Good for
- Validating data at application boundaries in functional TypeScript code.
Joi
Library / toolA schema-based validation library for JavaScript.
- Good for
- Checking structured request payloads and configuration objects.
Superstruct
Library / toolComposable validators for JavaScript and TypeScript values.
- Good for
- Checking application input with small reusable data structures.
T3 Env
Library / toolUtilities for validating environment variables with typed schemas.
- Good for
- Failing early when server or client configuration is missing or invalid.
Yup
Library / toolA schema builder for parsing and validating values.
- Good for
- Defining form constraints and reusable object validation rules.
Zod
Library / toolA TypeScript-oriented schema validation library.
- Good for
- Validating unknown data and deriving static types from schemas.
Before you decide
Try a small, realistic example. Check the runtime, accessibility, maintenance, and license requirements for the features you need.