What is json-schema-test-suite?

The JSON Schema Test Suite is a collection of standardized tests for checking whether a JSON Schema validator works correctly. JSON Schema is a way to describe what a valid JSON document should look like, which fields are required, what types they should be, and so on. If you're building a tool that checks JSON data against a schema, you want to be sure your tool gives the right answers. This suite provides a shared set of test cases so that anyone building a validator can verify their work against the same expectations. Each test case is a JSON file that contains a schema, some sample data, and a flag saying whether that data should pass or fail validation. For example, a test might define a schema requiring a string, then include one test where the data is a string (valid) and another where it's a number (invalid). The suite is organized by schema draft version, so you can test against the specific version of the JSON Schema spec you're targeting. It's written in plain JSON, so it works regardless of what programming language your validator is built in, you just need to load the files and run the checks yourself. This is primarily for developers building or maintaining JSON Schema validation libraries. The README lists dozens of validators across languages, JavaScript, Python, Go, Rust, Java, Ruby, and more, that already use the suite. If you're shipping a validator, running these tests gives you confidence you're handling edge cases correctly and matching the spec. The README notes that Draft 3 and Draft 4 have full coverage, and contributions are welcome if you spot gaps. The project is straightforward in its design: it's just data, not a framework or runner. You bring your own testing setup and interpret the JSON files yourself. That simplicity is the point, by staying language-agnostic, the same suite can serve the entire ecosystem of JSON Schema tools.