bugstack for JavaScript & TypeScript

Auto-fix TypeError, null access, async/await failures, and import errors in Express and Next.js.

What JS/TS Errors bugstack Fixes

• TypeError — null/undefined property access (Cannot read properties of undefined)
• x.map is not a function — calling array methods on non-array values
• Missing or wrong local imports — incorrect relative paths, missing named exports
• Unhandled async failures — missing await, unhandled promise rejection
• Next.js hydration mismatches — server/client HTML mismatch errors
• Next.js route handler errors — runtime failures in API routes and middleware

Install the SDK

Add bugstack to your project with a single command:

npm install bugstack-sdk

Then initialize it in your entry point:

import { bugstack } from 'bugstack-sdk';

bugstack.init({
  apiKey: process.env.BUGSTACK_API_KEY,
});

Example Fix

bugstack detects a TypeError caused by accessing a property on null and writes a surgical fix:

export function getUserName(user) {
  return user.profile.name;
}

// Runtime error when user.profile is null:
// TypeError: Cannot read properties
//   of null (reading 'name')

export function getUserName(user) {
  if (!user?.profile) {
    return null;
  }
  return user.profile.name;
}

Related Error Guides

• Fix TypeError: Cannot read properties of undefined in Next.js
• Fix Unhandled Promise Rejection in Express
• Fix TypeError with React useState
• Fix Hydration Mismatch in Next.js
• Fix ReferenceError in Next.js
• Fix CORS Error in Express API