ToolSink

API Response Formatter

Paste any raw API response. Auto-detects JSON or XML and prettifies for readability. Everything runs in your browser.

What is the API Response Formatter?

The API Response Formatter takes whatever a server sends back — JSON, XML, plain text — auto-detects the type and pretty-prints it. Paste a raw response from your terminal or Postman and get back a colour-coded, easy-to-review payload.

It saves the mental overhead of running the response through the right formatter yourself. If the payload is JSON it is formatted like JSON; if it is XML the tool switches to indented XML; if it is neither, it is displayed as-is with syntax highlighting.

Everything runs on the client so real production responses (including tokens and PII) stay private.

How to use the API Response Formatter

  1. 1Paste the raw response body into the input area.
  2. 2Let the tool auto-detect the type, or force one with the dropdown.
  3. 3Adjust indentation and casing as you would in a dedicated formatter.
  4. 4Copy the formatted output or download it.

Key features

  • Auto-detects JSON and XML
  • Handles nested payloads and mixed content
  • Colour-coded syntax highlighting
  • Detects and reports common structural errors
  • Copy / download buttons
  • Fully client-side

Examples

Mixed response

Paste a REST response that starts with headers and ends with a JSON body — the tool skips the headers and formats the JSON portion.

Why use this tool

  • One paste, no format switching
  • Speeds up API debugging
  • Works with any REST or SOAP endpoint
  • Safe for production payloads
  • Free and unlimited

Common use cases

  • Debugging third-party API integrations
  • Reviewing SOAP responses
  • Copying responses out of Postman for a bug ticket
  • Comparing responses across environments
  • Sharing a formatted example in a Slack thread

Frequently asked questions

What formats are supported?

JSON, XML and plain text. YAML is on the roadmap.

Can it handle very large responses?

Yes — the tool handles multi-megabyte payloads on desktop browsers.

Does it strip auth tokens?

No — you decide what to paste. Nothing is uploaded either way.

Is my data uploaded?

No — everything runs in the browser.

Does it validate schemas?

Not yet. Schema validation is planned for a future release.