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입력 방식

정확한 오류와 관련 코드만 붙여 넣으세요

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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;
}

생성 결과

Bug diagnosis

24 줄683 글자

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

무엇을 하는가

Bug 워크플로

Classifies likely causes from error text and code빠르게 복사해 실행하기 좋습니다

Gives a short reproduction and debug checklist빠르게 복사해 실행하기 좋습니다

Creates a repair template to start from빠르게 복사해 실행하기 좋습니다

적합한 사용자

누가 쓰면 좋은가

Learners stuck on the first stack trace

Frontend developers debugging API failures

Teams writing incident notes

예시

입력과 출력

Bug 예시

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

출력: Severity likely cause debug steps repair template and verification checklist

FAQ 및 제한

사용 전 확인

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.

사용 제한

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

사용 전 확인

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.

사용 제한

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