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Dev Tools
JSON Merge Patch Builder
Diff two JSON documents and emit a minimal RFC 7396 merge patch. Null deletes keys, objects deep-merge — simpler than RFC 6902. Apply-back verification, 100% client-side.
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JSON Patch Builder
Diff two JSON documents and emit a minimal RFC 6902 patch (add, remove, replace, copy, move, test). Verifies the patch by re-applying it to the source — 100% client-side.
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Generator
Mock API Response Generator
Generate realistic mock REST API responses with status codes, headers, pagination and error shapes. Export as JSON, raw HTTP, MSW handler, or curl.
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OpenAPI Generator
Generate OpenAPI 3.0 (Swagger) specifications online. Build API info, servers, paths, parameters, request bodies, and responses. Export as YAML or JSON instantly.
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