JSON schema

Features

• Validates JSON against a JSON Schema with Ajv, supporting both draft-07 and draft 2020-12.
• Lists every failure with its exact path and message instead of stopping at the first error.
• Infers a starter JSON Schema from a sample document, so you can bootstrap contracts from real API payloads.

How it works

1. Choose Validate to check data against a schema, or Generate to infer a schema from a sample document.
2. Pick the draft — draft-07 or 2020-12 — then paste your JSON data and schema (or just a representative sample to infer from).
3. Read the verdict live: a match confirmation, or each validation error listed by its instance path.

Related tools

• JSON formatterBeautify, minify, sort keys, validate — with live preview.
• JSON tree viewerExplore JSON as an interactive tree — expand, collapse, search, copy paths.
• JSON queryFilter and extract from any JSON using JSONPath — with live preview.
• JSON to tableTurn an array of objects into a sortable, filterable table — with CSV export.

Topics covered

• json schema generator
• validate json schema online
• infer json schema
• json schema tester
• ajv online
• draft 2020-12