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Bug 定位助手

把报错和最小代码片段整理成原因排查步骤和修复方向

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输入方式

粘贴完整报错和最相关的一小段代码

原因清单复现路径修复模板验证步骤本地优先默认隐私

输入

报错和代码

错误信息代码片段

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

生成结果

Bug 诊断

24 行683 字符

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

能做什么

Bug 工作流

Classifies likely causes from error text and code适合快速复制和执行

Gives a short reproduction and debug checklist适合快速复制和执行

Creates a repair template to start from适合快速复制和执行

适合谁

谁最适合用

Learners stuck on the first stack trace

Frontend developers debugging API failures

Teams writing incident notes

示例

输入和输出

Bug 示例

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

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

常见问题和限制

使用前知道这些

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.

使用限制

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

报错和代码

错误信息

代码片段

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

使用前知道这些

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.

使用限制

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