Công cụ AI cho lập trình viên

Tìm Bug

Biến lỗi và snippet thành nguyên nhân, bước và hướng sửa

NhanhDễ sao chépKhông cần đăng nhập

Kiểu nhập

Dán lỗi chính xác và đoạn code nhỏ liên quan

Nguyên nhân tái hiện template fix xác minhƯu tiên cục bộMặc định riêng tư

Input

Error and code

Error messageCode snippet

async function loadUser(id) {
  const res = await fetch("/api/users/" + id);
  const data = await res.json();
  return data.user.name;
}

Kết quả

Bug diagnosis

24 dòng683 ký tự

Severity
Normal debugging risk

Most likely cause
A value is undefined or null before property access

Debug steps
1. Reproduce with the smallest input that still fails
2. Log the value immediately before the failing line
3. Check network status response body and server logs
4. Add guards for missing data before using nested fields
5. Write one regression test or manual checklist after fixing

Repair template
const userName = data?.user?.name;
if (!userName) {
  throw new Error("User name is missing from API response");
}
return userName;

What to verify
- The same input no longer fails
- Missing data produces a clear error
- The fix does not hide a real server or auth issue

01Severity

Normal debugging risk

02Most likely cause

A value is undefined or null before property access

03Debug steps

1. Reproduce with the smallest input that still fails 2. Log the value immediately before the failing line 3. Check network status response body and server logs 4. Add guards for missing data before using nested fields 5. Write one regression test or manual checklist after fixing

04Repair template

const userName = data?.user?.name; if (!userName) { throw new Error("User name is missing from API response"); } return userName;

05What to verify

- The same input no longer fails - Missing data produces a clear error - The fix does not hide a real server or auth issue

Công cụ làm gì

luồng Bug

Classifies likely causes from error text and codeTối ưu cho công việc nhanh và dễ sao chép

Gives a short reproduction and debug checklistTối ưu cho công việc nhanh và dễ sao chép

Creates a repair template to start fromTối ưu cho công việc nhanh và dễ sao chép

Phù hợp với

Ai nên dùng

Learners stuck on the first stack trace

Frontend developers debugging API failures

Teams writing incident notes

Ví dụ

Đầu vào và đầu ra

Bug vi du

Đầu vào: TypeError Cannot read properties of undefined reading name plus the failing function

Đầu ra: Severity likely cause debug steps repair template and verification checklist

FAQ và giới hạn

Trước khi dùng

What should I paste

Paste the exact error message stack trace if available and the smallest related code snippet.

Why keep the code small

Smaller reproductions make the real failing value and line easier to isolate.

Giới hạn sử dụng

Needs the exact error text to be useful
Cannot see server logs unless you paste them
The repair template is a starting point not a guaranteed patch

Error and code

Error message

Code snippet

async function loadUser(id) {
  const res = await fetch("/api/users/" + id);
  const data = await res.json();
  return data.user.name;
}

Severity Normal debugging risk Most likely cause A value is undefined or null before property access Debug steps 1. Reproduce with the smallest input that still fails 2. Log the value immediately before the failing line 3. Check network status response body and server logs 4. Add guards for missing data before using nested fields 5. Write one regression test or manual checklist after fixing Repair template const userName = data?.user?.name; if (!userName) { throw new Error("User name is missing from API response"); } return userName; What to verify - The same input no longer fails - Missing data produces a clear error - The fix does not hide a real server or auth issue

Trước khi dùng

What should I paste

Paste the exact error message stack trace if available and the smallest related code snippet.

Why keep the code small

Smaller reproductions make the real failing value and line easier to isolate.

Giới hạn sử dụng

Needs the exact error text to be useful
Cannot see server logs unless you paste them
The repair template is a starting point not a guaranteed patch