A Step-by-Step Checklist for Diagnosing Broken API Requests Using Browser Tools

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A developer-focused guide outlines a structured approach to debugging common API request failures, including 401, 400, and empty response errors. The checklist recommends first isolating the request using curl to determine whether the issue lies in the API or the calling code. It then walks through interpreting HTTP status codes, decoding JWT tokens locally to check expiry and audience fields, and correctly encoding URL parameters. The guide also cautions against pasting live credentials or production tokens into online tools, advising the use of test values or local alternatives instead. Each step is paired with reusable code snippets to make troubleshooting faster and more systematic.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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