Start with the job in front of you
An API response can look valid while still being wrong for the code consuming it. A number may be a string, a property may be nested one level deeper, or an empty array may be a valid response.
A short test is usually faster than trying to fix a large final file after the fact. Keep the original nearby, name the exported version clearly, and change one setting at a time when the result matters.
Use a small, repeatable routine
Format the response, read the top-level keys, and compare one real payload with the shape your code expects. Keep a redacted example in the issue or test case when that is safe.
The useful part of a browser tool is not simply getting an output. It is being able to reproduce the same result tomorrow, explain what changed, and notice when an input or assumption has changed.
Do one last check before sharing
Check status code, headers, and body together. A correct JSON body does not explain an authorization or caching problem by itself.
If the result will be published, sent to a client, or used to make a decision, compare it with the source rather than trusting a filename or a successful download message.
Practical checklist
- Keep the original input until the output is checked.
- Test the workflow on a small sample first.
- Use clear names for exported versions.
- Review the result in the app where it will actually be used.
- Record important settings or assumptions.