Code Error to Fix
Paste a cryptic error message or stack trace, get a plain-English explanation of what went wrong, and receive a corrected code snippet.
3 stepsWorkflow Steps
Paste the Error
Copy the full error message or stack trace. Include the relevant code context around where the error occurs for the most accurate diagnosis.
command: explain-errorUnderstand the Problem
Echoo explains what the error means in plain English, identifies the root cause, and describes why your code triggered it.
command: explain-errorApply the Fix
The code-improver command rewrites your code with the fix applied, including comments explaining what changed and why.
command: code-improver
Example
Input
TypeError: Cannot read properties of undefined (reading 'map') at UserList (UserList.tsx:12:24) at renderWithHooks (react-dom.development.js:14985) // UserList.tsx const UserList = ({ users }) => { return ( <ul> {users.map(user => <li key={user.id}>{user.name}</li>)} </ul> ); };
Output
**What went wrong:** The `users` prop is `undefined` when the component renders. Calling `.map()` on `undefined` throws a TypeError. **Root cause:** The parent component either doesn't pass the `users` prop or passes it before the data has loaded (e.g., during an async fetch). **Fixed code:** ```tsx const UserList = ({ users = [] }) => { if (!users.length) return <p>No users found.</p>; return ( <ul> {users.map(user => <li key={user.id}>{user.name}</li>)} </ul> ); }; ``` **Changes:** Added a default value (`[]`) for the `users` prop and an empty-state check.
Tips
Include 5-10 lines of surrounding code, not just the error line.
Paste the complete stack trace -- truncated traces lead to incomplete diagnoses.
Mention your framework and version (e.g., React 18, Node 20) for version-specific fixes.
If the fix doesn't work, paste the new error and iterate.
Frequently Asked Questions
Yes. Echoo handles errors from JavaScript, TypeScript, Python, Go, Rust, Java, C++, Ruby, and more. Include the language context for best results.
It can analyze logic issues if you describe the expected vs. actual behavior alongside the code. Pure logic bugs without error messages need more context.
By default it applies a minimal fix. If you want a broader refactor, explicitly ask the code-improver step to optimize the surrounding code.
Yes. Paste the compiler or linter output along with the file path and Echoo will diagnose and fix the issue.
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