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✅ JSON Schema Validator
Validate JSON data against a schema. Catch errors instantly with fast, browser-based JSON schema validation.
JSON Schema Validator
Validate your JSON against a JSON Schema directly in the browser. Perfect for debugging APIs, configuration files, and ensuring data integrity.
How to use this tool
- Paste your JSON Schema on the left and the JSON document on the right.
- Click Validate to compile the schema with AJV and check the data.
- Review any validation errors or copy/download the inputs for documentation.
Ideal for
- Testing webhook payloads against published schemas before shipping.
- Validating infrastructure-as-code templates that rely on strict JSON structures.
- Teaching teammates how schema requirements map to real-world data.
Validation tips
- Use Pretty Print to keep large schemas readable.
- Enable "required" arrays and data types in your schema to catch omissions early.
- Remember that AJV's strict mode is relaxed here—turn it on locally if you need extra warnings.
FAQ
- Which JSON Schema draft is supported?
- AJV supports draft 2020-12 and earlier. Include a $schema property if you rely on specific features.
- Why do I see generic errors?
- Compile errors often mean the schema itself is invalid JSON or references unknown keywords.
- Is my data uploaded?
- No. All validation runs locally in your browser with WebAssembly-backed AJV.
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