smart-error-handler

A production-safe and developer-friendly Express error-handling middleware that provides:

• ✅ Clean, user-friendly error pages in production
• 🔥 Interactive stack traces in development
• 🧠 Clickable stack frames with highlighted source code
• 📦 JSON fallback for API clients
• ⚙️ Custom logging and configurable code snippets

Ideal for Express apps that want excellent developer experience without exposing sensitive details in production.

Features

• Interactive HTML stack trace (development only)
• Syntax-highlighted source code snippets
• Click-to-expand stack frames
• Safe minimal error page in production
• JSON response fallback for APIs
• Custom logger support
• Configurable snippet context size

Environment Modes

• The middleware automatically switches behavior based on:Environment Modes

Installation

npm install smart-error-handler

NODE_ENV=production

const express = require('express');
const { ErrorHandler, NotFoundHandler } = require('smart-error-handler');

const app = express();

// Your routes
app.get('/', (req, res) => {
  throw new Error('Boom!');
});

// Register AFTER all routes
app.use(NotFoundHandler());
app.use(ErrorHandler({ logger: console.log }));

app.listen(3000, () => {
  console.log('Server running on http://localhost:3000');
});