valijson ☆

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Description:
Header-only C++ library for JSON Schema validation

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: c++ json-schema validation header-only library

Install: brew install valijson

About:
Valijson is a header-only C++ library for validating JSON documents against JSON Schema drafts 2020-12, 2019-09, 07, and 04. It provides a robust, dependency-free solution for enforcing data contracts and structure within C++ applications. Its primary value is in its ease of integration, requiring only the inclusion of header files.

Key Features:

Header-only library for easy integration
Supports multiple JSON Schema drafts
No external dependencies required
Compatible with standard C++11+ libraries

Use Cases:

Validating API request and response payloads in C++ backends
Ensuring configuration file integrity in C++ applications
Enforcing data contracts in microservices

Alternatives:

nlohmann/json – Valijson is specifically for validation (often used alongside nlohmann/json), whereas nlohmann/json is primarily a general-purpose JSON parsing library.
json-schema-validator – Valijson is header-only, while json-schema-validator typically requires a build step and linking against the Boost library.

Version History

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