Free Developer Tool

Claude Code Prompt Generator

Paste in the error you are stuck on and the details around it. This tool assembles a clean, well-structured prompt you can drop straight into Claude Code — or any AI coding assistant — so it has the context it needs to diagnose the root cause and propose a fix. Everything runs in your browser; nothing is uploaded, and no login is required.

Describe the problem

How to write a good debugging prompt

AI assistants are far more accurate when they get the same context a human engineer would ask for. A vague "it's broken, fix it" forces the model to guess; a structured prompt lets it reason. This generator organizes your input into the sections that matter most:

  • The exact error. Copy the literal message and code, not a paraphrase. "Something about undefined" and TypeError: Cannot read properties of undefined lead to very different investigations.
  • The stack trace. The first few frames usually point at the file and line where the failure surfaced. Including it lets the assistant jump straight to the relevant code.
  • Framework and versions. Many bugs are version-specific — a breaking change in a major release, a deprecated API, a peer-dependency mismatch. Versions narrow the search dramatically.
  • Environment. "Works on my machine" failures are usually environment differences: Node version, OS, a production build, a containerized runtime, or a serverless platform with a different filesystem.
  • Recent changes. If it worked yesterday, what changed? A dependency bump, a refactor, a config edit, or a new deploy is the most common culprit.
  • What you've tried. This stops the assistant from suggesting things you've already ruled out and signals where the real problem is not.

Is this related to an HTTP status code?

If your error is an HTTP response — a 500, 502, 403, 404, or a CDN-specific code like Cloudflare 521 — read the matching guide first. Pasting the likely cause from the guide into your prompt makes the assistant's job much easier. Browse the full HTTP status code reference or the guides index.

Privacy

This tool is entirely client-side. The text you type never leaves your browser — there is no server, no account, and no storage of your input. Closing or refreshing the page clears everything.