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How can I implement middleware in Node.js with Express?

An example of an AI chatbot conversation about advanced Node.js and Express middleware implementation.

😀
You

How can I implement middleware in Node.js with Express?

MagicBuddy
MagicBuddy

To implement middleware in Node.js with Express, you can create a function that takes the request, response, and next parameters.

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You

Can you give me an example of a logging middleware?

MagicBuddy
MagicBuddy

Sure! Here's a simple logging middleware:

function logger(req, res, next) {
    console.log(`${req.method} ${req.url}`);
    next();
}
app.use(logger);
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You

What about error handling middleware?

MagicBuddy
MagicBuddy

Error handling middleware is defined with four parameters. Here's an example:

app.use((err, req, res, next) => {
    console.error(err.stack);
    res.status(500).send('Something broke!');
});
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You

How do I use third-party middleware?

MagicBuddy
MagicBuddy

You can install third-party middleware using npm and then use it in your app like this:

const bodyParser = require('body-parser');
app.use(bodyParser.json());
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