API TOOLS

Request / Response Mapper

Flatten request and response JSON into field paths, compare names and identify fields that exist on only one side.

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✓Runs locally in your browser. Your data is not uploaded unless you save the workspace.
Request / Response Mapper
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ABOUT THIS TOOL

A focused mapper for integration analysis

When request and response payloads are large, manual field tracing becomes slow. The mapper exposes flattened paths and simple matches so you can quickly see what was sent, what came back and which names may correspond.

COMMON USES

Useful for everyday developer work

  • Compare integration request and response contracts.
  • Find response-only fields returned by an API.
  • Spot exact field-name matches across different JSON paths.
HOW IT WORKS

Use this tool in three steps

  1. Paste your data.
  2. Choose any available options and run the tool.
  3. Review, copy or download the result.
PRIVACY

Local by default

This public tool runs in your browser. Its input is not written to the DevPayload database.

FAQ

Frequently asked questions

Does the mapper infer business meaning?

The current mapper is deterministic. It compares flattened paths and simple field-name relationships rather than inventing semantic mappings.

Are request and response payloads uploaded?

No. Normal mapping runs locally in your browser.

Do I need an account?

No. Public deterministic tools work without signing in.

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