Check API contracts
Validate request and response payloads before they break consumers or downstream services.
JSON Schema Validator Online
Validate JSON payloads against JSON Schema Draft-07 in the browser. Use this page to check API request bodies, configuration files, and application payloads before they reach production or get converted for AI workflows.
JSON Schema Validator
Draft-07 via Ajv
JSON schema validator benefits
Catch bad data early
Find missing fields, invalid formats, and type mismatches before they reach storage, prompts, or UI layers.
Support typed AI workflows
Validate JSON first, then compare it with TONL when you want stricter typed workflows for queryable data.
JSON Schema validator FAQ
What is a JSON Schema validator?
A JSON Schema validator checks whether a JSON document matches a schema definition, including required fields, value types, formats, and allowed structure.
Which schema version is supported here?
This validator is built around JSON Schema Draft-07 using Ajv, which covers many common validation workflows for APIs and application payloads.
Should I repair JSON before validating it?
Yes. If the document is malformed, repair it first so the validator can parse the JSON and then check it against your schema rules.