JSON Schema validator

Validate JSON data against a JSON Schema with draft-aware validation and readable error output.

Schema

Provide a JSON Schema document. Draft-07 and 2020-12 are detected automatically.

JSON data

Paste the JSON document you want to validate against the schema.

Validation options

These options change how much detail the validator returns and whether format keywords are enforced.

Detected draft2020-12

Validation result

Real-time feedback as you edit the schema and data above.

What is JSON Schema validation?

Use this tool when you want fast feedback while designing payloads, debugging API examples, or checking whether a schema change breaks sample data. Everything runs locally in the browser, so the raw JSON never leaves the page.

Where it fits well

  • Reviewing example payloads in API docs.
  • Validating mock data during frontend work.
  • Checking format-sensitive fields such as uuid, email, or date-time.

What it does not replace

  • Server-side authorization and business rules.
  • Contract checks that depend on remote references or application state.
  • Full CI validation against your whole schema set.

How to use

Paste or import JSON, choose options and run. Large input previews are bounded; copying and downloading preserve complete output