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Extract JSON Schema from API Response
Generate a schema from a sample API response to document fields and validate future payloads.
Problem
An API returns useful data, but the field structure is undocumented or changing.
What to do
Schema extraction turns an example response into a starting point for validation, documentation, and client code generation.
- 1Paste a representative API response.
- 2Generate the inferred schema.
- 3Review optional fields and validate future responses against the schema.
Use the browser tool
API Schema Extractor is a free, browser-based tool that helps you produce ready-to-use output in seconds. Infer a schema from sample responses. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.
People also ask
- How do I use API Schema Extractor?
- Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Infer a schema from sample responses.
- Is my data uploaded or stored anywhere?
- No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.
- Is API Schema Extractor free?
- Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.