Flexible Python configuration system. The last one you will ever need.

Elixir library for declarative data description and validation

Schema based validator for AdonisJS

OpenAPI 3 parser, JSON schema and request validator.

TypeScript friendly Data validator for JavaScript.

A FAST C++ library to validate the HTTP requests against the OpenAPI specifications of the REST server.

Themis is a validation and processing library that helps you always make sure your data is correct.

🛡️ EnvGuard – A powerful NPM package that validates your .env files against a predefined schema, ensuring all required environment variables are set and secure. Prevent misconfigurations in production by detecting missing values, insecure defaults, and enforcing .env.example consistency across teams.

A simple, flexible, and extensible JavaScript/TypeScript data validation library, Allows dynamically Validation with schemas

Simplify AJV Schema Validation with TypeScript

A simple object validator for tiny schemas

Schema validator in go

This class validates JSON payloads by using predefined schema based on basic necessary data types. Data types validation can be extended by creating new classes and new constraints can be added by writing new functions in Constraints class.

Feathers hooks for schema validation using fastest-validator as a core validator

Another schema validator :)

Validate GS1 EPCIS 2.0 documents and events against the official JSON Schema, and EPCIS 1.2 or 2.0 XML against the EPCglobal XSDs. Reports every schema error with line and location instead of stopping at the first one. Covers capture and query documents. Java library, REST API, servlet and Quarkus extension.

GraphQL Workshop Tutorial by team API platform

Automate AI research tasks with a fully agentic platform that converts papers to publications using Claude Code.

portable C++23 command-line tool for validating data files (JSON, YAML, TOML) against a schema.

Schema.org document checker