How do I validate JSON against a schema?

Paste your JSON Schema and your data into the tool. It reports whether the data is valid and lists specific errors for any fields that don't conform.

What does JSON Schema check?

It can enforce required properties, data types, string formats, numeric ranges, array constraints, and more, so your data matches an agreed structure.

Is my data uploaded for validation?

No. Validation runs entirely in your browser.

All tools/Data Inspector

JSON Schema Validator

Runs locally

Validate complex JSON payloads against strict schemas securely in your browser. Powered by Ajv.

Validation Failed:

/age must be >= 0

JSON Schema

JSON Data

Validate JSON data against a JSON Schema in your browser and get clear, pinpointed error messages when it doesn't conform. Paste your schema and data to check required fields, types, and constraints — all locally, with nothing uploaded.

How to validate JSON against a schema

1Paste your JSON Schema in one panel.
2Paste the JSON data you want to check in the other.
3See whether it's valid, with specific errors pointing to the problem fields.

Catch bad data before it ships

JSON Schema lets you describe the shape your data must take — required properties, types, formats, and value ranges. Validating against it catches malformed payloads early, whether you're testing an API contract, a config file, or data you're about to import, with errors that tell you exactly which field failed and why.

Frequently asked questions

How do I validate JSON against a schema?: Paste your JSON Schema and your data into the tool. It reports whether the data is valid and lists specific errors for any fields that don't conform.
What does JSON Schema check?: It can enforce required properties, data types, string formats, numeric ranges, array constraints, and more, so your data matches an agreed structure.
Is my data uploaded for validation?: No. Validation runs entirely in your browser.