Category: JavaScript Answers

Sometimes, we want to decompress a Node.js request’s module gzip response body.

In this article, we’ll look at how to decompress a Node.js request’s module gzip response body.

How to decompress a Node.js request’s module gzip response body?

To decompress a Node.js request’s module gzip response body, we can set the encoding option to null and then use the zlib.gunzip method.

For instance, we write

const request = require('request');
const zlib = require('zlib');

request(url, {
  encoding: null
}, (err, response, body) => {
  if (response.headers['content-encoding'] === 'gzip') {
    zlib.gunzip(body, (err, unzipped) => {
      callback(unzipped.toString());
    });
  } else {
    callback(body);
  }
});

to call request with an object that has encoding set to null.

Then in the callback, we check if the content-encoding response header is 'gzip'.

If it is, then we call zlib.gunzip to decompress the response body.

And then we can get the unzipped response contents from the unzipped parameter in the gunzip callback.

Conclusion

To decompress a Node.js request’s module gzip response body, we can set the encoding option to null and then use the zlib.gunzip method.

Sometimes, we want to destroy a cookie with Node.js and Express.

In this article, we’ll look at how to destroy a cookie with Node.js and Express.

How to destroy a cookie with Node.js and Express?

To destroy a cookie with Node.js and Express, we can use the res.clearCookie method.

For instance, we write

res.clearCookie("key");

to call clearCookie with the 'key' of the cookie to delete the cookie with key 'key'.

Conclusion

To destroy a cookie with Node.js and Express, we can use the res.clearCookie method.

Sometimes, we want to get the redirected URL from the Node.js request module.

In this article, we’ll look at how to get the redirected URL from the Node.js request module.

How to get the redirected URL from the Node.js request module?

To get the redirected URL from the Node.js request module, we can get the redirected URL from res.headers.location property.

For instance, we write

const url = 'http://www.google.com';

request({
  url,
  followRedirect: false
}, (err, res, body) => {
  console.log(res.headers.location);
});

to call request with an object that has the followRedirect property set to true to follow redirects.

Then we can get the redirected URL from res.headers.location in the request callback after the request is done.

Conclusion

To get the redirected URL from the Node.js request module, we can get the redirected URL from res.headers.location property.

Sometimes, we want to modify the Node.js request default timeout time.

In this article, we’ll look at how to modify the Node.js request default timeout time.

How to modify the Node.js request default timeout time?

To modify the Node.js request default timeout time, we can set the timeout option when we call request.

For instance, we write

const options = {
  url: 'http://example.com',
  timeout: 120000
}

request(options, (err, resp, body) => {
  //...
});

to call request with options.

We set the timeout option to set the request timeout to 120000 milliseconds.

Conclusion

To modify the Node.js request default timeout time, we can set the timeout option when we call request.

Sometimes, we want to add a class conditionally to div inline with Jade.

In this article, we’ll look at how to add a class conditionally to div inline with Jade.

How to add a class conditionally to div inline with Jade?

To add a class conditionally to div inline with Jade, we can use a ternary expression.

For instance, we write

div#demo.collapse(class=typeof fromEdit === "undefined" ? undefined : "in")

to check if fromEdit is undefined with typeof fromEdit === "undefined".

If it is, we set the class attribute to undefined.

Otherwise, we set it to in.

Conclusion

To add a class conditionally to div inline with Jade, we can use a ternary expression.