Category: JavaScript

Sometimes, we want to remove a directory which is not empty with Node.js.

In this article, we’ll look at how to remove a directory which is not empty with Node.js.

How to remove a directory which is not empty with Node.js?

To remove a directory which is not empty with Node.js, we can use the rm or rmSync method.

For instance, we write

const fs = require('fs');

fs.rm('/path/to/delete', {
  recursive: true
}, () => console.log('done'));

to call fs.rm with the path to delete as the first argument.

We set recursive to true in the object in the 2nd argument to let us delete an non-empty directory.

The 3rd argument is a callback that runs when rm is done.

rm will delete the directory asynchronously.

We call rmSync to delete a non-empty directory synchronously.

For instance, we write

const fs = require('fs');
fs.rmSync('/path/to/delete', {
  recursive: true
});
console.log('done');

to call rmSync with the path of the directory to delete and the same object as the arguments.

Conclusion

To remove a directory which is not empty with Node.js, we can use the rm or rmSync method.

Sometimes, we want to stringify an Error using JSON.stringify.

In this article, we’ll look at how to stringify an Error using JSON.stringify.

How to stringify an Error using JSON.stringify?

To stringify an Error using JSON.stringify, we can call inspect.

For instance, we write

import {
  inspect
} from "util";

const myObject = new Error("This is error");
console.log(inspect(myObject, {
  depth: null
}));

to call inspect with the myObject error object.

The 2nd argument is an object with depth set to null, which lets us stringify all nested properties in the myObject error object.

Conclusion

To stringify an Error using JSON.stringify, we can call inspect.

Sometimes, we want to determine a user’s IP address in Node.js.

In this article, we’ll look at how to determine a user’s IP address in Node.js.

How to determine a user’s IP address in Node.js?

To determine a user’s IP address in Node.js, we can use the req.socket.remoteAddress property.

For instance, we write

app.post('/get/ip/address', (req, res) => {
  res.send(req.socket.remoteAddress)
})

to return the user’s IP address that we get from req.socket.remoteAddress as the response.

Conclusion

To determine a user’s IP address in Node.js, we can use the req.socket.remoteAddress property.

Sometimes, we want to specify the required Node.js version in package.json.

In this article, we’ll look at how to specify the required Node.js version in package.json.

How to specify the required Node.js version in package.json?

To specify the required Node.js version in package.json, we can set the engines.npm and engines.node property in package.json.

For instance, we write

"engines": {
  "npm": ">=7.0.0",
  "node": ">=16.0.0"
}

to set the required Node version to 16.0.0 or higher.

Conclusion

To specify the required Node.js version in package.json, we can set the engines.npm and engines.node property in package.json.

Sometimes, we want to check if path is file or directory with Node.js.

In this article, we’ll look at how to check if path is file or directory with Node.js.

How to check if path is file or directory with Node.js?

To check if path is file or directory with Node.js, we can use the fs.lstat with the isDirectory method.

For instance, we write

(await fs.lstat(pathString)).isDirectory() 

to call fs.lstat with the pathString to return a promise which resolves to the stat object.

Then we call isDirectory on the stat object to check if the pathString points to a directory.

To check if the pathString points to a file, we can use the isFile method.

For instance, we write

(await fs.lstat(pathString)).isFile() 

Conclusion

To check if path is file or directory with Node.js, we can use the fs.lstat with the isDirectory method.