Schema Labs

Developer preview

Schema playground

Validate a payload against a schema, or compare two schema revisions. Documents are processed in this tab and never uploaded.

Supported scope & limits
Contract
JSON Schema 2020-12 or draft-07 · up to 512 KB
Data
Editable sample data · documents stay in this tab
Runs in this tab · nothing is uploaded
Ready when you are.

Load the example or paste your documents, then run a check.

Comparison is a conservative structural review, not a proof of API compatibility. Remote references are not fetched. Samples are fictional and simplified, not official schemas. Inputs are not persisted; reloading clears your changes. Read the limitations.

Claude API settings

Bring your own Anthropic key. Only the breaking findings (JSON Pointer paths, rule names and messages) are sent, directly from this tab to api.anthropic.com. Schema Labs servers never see the key or the findings. Your schemas and payloads are never sent.