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API Error Response Formatter

Format API error responses, extract error codes, messages, validation errors, traces, and useful debugging details directly in your browser.

Paste a raw HTTP error response or JSON error body copied from logs, API clients, browser DevTools, support tickets, or backend debugging.

Formatting Options

Output

Formatted API error output will appear here.
API error formatting happens directly in your browser. Your response body, headers, trace IDs, and error details are not uploaded to a server.

Formatting API Error Responses for Debugging

API error responses often contain useful information, but it is not always easy to read when it is copied from logs, browser DevTools, backend traces, or API clients. The status code, error code, message, validation fields, request ID, and trace ID can be buried inside a large JSON object.

This API Error Response Formatter pulls out the important parts and formats the response into a cleaner view. It helps when you are debugging failed API calls, preparing support notes, or sharing an error response with another developer.

Reading an API Error Without Searching Through JSON

  1. Paste a raw HTTP error response or JSON error body.
  2. Choose whether the input includes headers or only JSON.
  3. Hide trace values if you plan to copy or share the output.
  4. Review the status, error code, message, and validation issues.
  5. Copy the formatted report, summary, or clean JSON output.

Common API Error Formatter Use Cases

  • Formatting messy JSON error bodies from API responses.
  • Reading validation errors field by field.
  • Finding error codes, trace IDs, and request IDs quickly.
  • Cleaning API error examples before adding them to tickets.
  • Checking whether a response is a 400, 401, 403, 404, 422, or 500 error.
  • Preparing safer output before sharing logs or debugging notes.

Example API Error Response

{
  "error": {
    "code": "VALIDATION_FAILED",
    "message": "The request body has validation errors.",
    "details": [
      {
        "field": "email",
        "message": "Email is required"
      }
    ]
  },
  "traceId": "trace_abc123"
}

Trace IDs, Request IDs, and Shared Error Logs

Trace IDs and request IDs are useful because they help connect an API error to backend logs. They are often safe to share inside a team, but you may still want to hide them before posting output publicly or sending it outside your project.

If the response contains user data, tokens, private URLs, or production details, replace those values with safe examples before sharing the formatted output.

Frequently Asked Questions

What does an API error response formatter do?

It formats an API error response and extracts useful fields such as status code, error code, message, validation errors, request ID, and trace ID.

Can this format validation errors?

Yes. It looks for common validation error arrays and shows them as field, message, and code rows when possible.

Does this send the error response anywhere?

No. The response is formatted directly in your browser.

Can this read raw HTTP error responses?

Yes. It can read a raw HTTP response with a status line, headers, and JSON body.

Is my API error data uploaded anywhere?

No. Formatting happens directly in your browser, and your error response is not uploaded to a server.