Intermediate
Best Gemini Prompt for Debug & Fix
Why Gemini?
Gemini traces bugs across multi-file call stacks, interprets cryptic error messages in context, and proposes targeted fixes without rewriting unrelated code — especially strong on runtime and async issues.
Prompt Template
Help me debug and fix the following issue.\n\nProblem description: {problem_description}\nError message (exact): {error_message}\nWhen it occurs: {when_it_occurs} (e.g., only in production, on specific user actions, intermittently)\nExpected behavior: {expected_behavior}\nActual behavior: {actual_behavior}\n\nEnvironment:\n- Language / framework: {language_framework}\n- Runtime version: {runtime_version}\n- OS / deployment: {deployment}\n\nRelevant code (paste all files involved in the call stack):\n{code}\n\nWhat I've already tried: {already_tried}\n\nPlease provide:\n1. Root cause diagnosis with explanation\n2. Minimal targeted fix (change as little as possible)\n3. Why the fix works\n4. Any related vulnerabilities or issues you noticed while reading the code\n5. How to test that the fix resolves the issue without regression Example Output
Root cause: async handler not awaited — Express catches resolved promise before DB query completes on cold Lambda starts. Fix: add await before db.findUser(). One-line change. Related: missing try/catch means DB errors silently return {}. Test: load test with artillery targeting 50 RPS.
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Tips for Better Results
Include the full stack trace if one exists — even a partial trace cuts diagnosis time dramatically. For intermittent bugs, describe the exact traffic conditions when it reproduces.
Example (filled in)
API returns 200 but body is empty intermittently, no error message, ~30% of requests under load, Should return user object, Returns {}, Node.js Express, Node 20, AWS Lambda, [route handler + DB query pasted], Added console.log (shows data present before res.json())