What is Callback Hell in JavaScript | Refactoring Callback Hell

What is callback hell in JavaScript? Should we not use callbacks? How to use callbacks properly in JavaScript? A function passed to another function as an argument is a callback function. Callback function is passed as argument to the main function. It will be executed after the main function completes its job. This is why its called as callback function. Too many nested callback functions result in callback hell. In this video I have explained callback, callback hell, promises and async/await with examples.

The nested callbacks make the code harder to read and understand, especially as the number of steps increases. This can make it difficult to reason about the behavior of the code and to debug it if there are errors. This is exactly what is called 'Callback hell'.

Callback hell is a situation in asynchronous programming where the use of multiple nested callbacks creates complex and hard-to-read code. Code will work, and it will be asynchronous or non-blocking. But it will be hard to read and hard to maintain. The nested callbacks make the code harder to read and understand, harder to maintain, and more prone to bugs. To avoid callback hell,
we can use other techniques such as promises or async/await syntax.

The use of Promises makes the code more readable and easier to understand than the nested callbacks. Additionally, the use of the catch method allows us to handle errors that may occur during the execution of the Promises. Async/await is even more simpler than promises.

I would say, it is a lot cleaner to use async and await.

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