Callback Hell

Callback hell refers to the obstacles faced by JavaScript developers when working on large-scale projects. The cause of callback hell is not entirely the fault of the developer; it's partially because of how JavaScript handles async operations. By using callbacks to handle multiple async operations, it's very easy for things to get out of control. The following code illustrates an example of callback hell:

request('url', (error, response) => {
   // Do something here
   request('another url', (error, response) => {
      disk.write('filename', (result) => {
        if (result.this) {
           process(something, (result) => {
              request('another url', (error, response) => {
 ...