Json schema validator online — contract testing
Schemas describe allowed shapes: required keys, types, min/max, enums. A json schema validator online lets you verify responses and config files match that contract before CI or production.
JSON Schema Validator Online — Validate JSON Free
Free · Browser-only · No upload · Ajv
JSON Schema Validator Online
Use this json schema validator online to validate json against schema rules before deploy. A practical json schema checker and json schema validation tool — run a json schema test online on API payloads with clear errors when you validate json schema online.
Valid — JSON matches schema
JSON Schema
JSON data
Validate JSON schema online
Json schema checker vs syntax-only lint
Valid JSON can still be wrong for your API. This json schema checker reports path-level errors (missing properties, wrong types) so you can fix payloads faster than reading raw logs.
Json schema test online — private validation
Paste production-like samples locally — nothing uploads. Ideal when you need to validate json schema online on NDA data or staging tokens during integration work.
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Common questions
JSON Schema FAQ
What JSON Schema drafts are supported?
The validator uses Ajv with draft-07 style schemas (the $schema URL in your file). Most OpenAPI and hand-written schemas work; very new draft features may need schema tweaks.
Does this validate format keywords like email?
Yes. Common string formats (email, uri, date-time, etc.) are enabled via ajv-formats when your schema uses a format keyword.
Is this the same as JSON Formatter?
No. Formatter only checks JSON syntax. This tool checks whether your data matches rules in a separate schema file — types, required fields, enums, and more.
Can I test API responses?
Yes. Paste your response JSON in the data panel and your contract schema in the schema panel — a quick json schema test online before shipping.
Is data sent to a server?
No. Schema compilation and validation run locally with Ajv in your browser.
Why did schema compilation fail?
Usually the schema JSON is invalid or uses unsupported keywords. Check syntax first, then simplify nested $ref chains if needed.