ValidateThis

JSON Schema validator

Related tools

Validators and utilities that complement JSON Schema validator — same session, no sign-up.

Validate JSON instances against a JSON Schema in the browser with Ajv (formats enabled). Not a remote $ref resolver or full meta-schema audit.

Validate JSON instances with Ajv in the browser (ajv-formats enabled). Paste schema and data as JSON — large or exotic $schema drafts may need trimming.

How to use this tool

  1. Paste your sample in the input (or fetch from URL if this tool supports it).
  2. Run the main action on the page to execute JSON Schema validator.
  3. Read the result, fix the source data or config, and re-run if needed.

What this check helps you catch

  • Validate JSON instances against a JSON Schema in the browser with Ajv (formats enabled). Not a remote $ref resolver or full meta-schema audit.
  • Limits called out in the description (what this tool does not verify — e.g. live network reachability, issuer databases, or strict schema contracts unless stated).
  • Structural or syntax mistakes that would break parsers, serializers, or the next step in your workflow.

FAQ

What does JSON Schema validator do?
Validate JSON instances against a JSON Schema in the browser with Ajv (formats enabled). Not a remote $ref resolver or full meta-schema audit. Use the form above, then see “How to use” and “What this check helps you catch” for behavior detail.
Is this a substitute for server-side validation?
No. Use it for manual checks and triage; production systems should still validate and authorize on the server.
Where does processing happen?
Most validators here run in your browser. If a tool calls an API, that is stated on the page. See the site privacy policy for data handling.