How Can I Avoid Nested Promises and Improve Code Readability in Node.js?

Unraveling Nested Promises

When working with network code in NodeJS and utilizing promises, it's common to encounter nested promises. While this structure can be necessary at times, it can also lead to cluttered and unreadable code. A cleaner and more efficient approach is to chain promises instead of nesting them.

The Problem of Nested Promises

Consider the following example:

This code snippet makes three API requests in series, using nested promises. While it functions correctly, it's visually cluttered and difficult to follow.

Chaining Promises Instead

To chain promises instead of nesting them, modify the then callbacks to return the next promise:

Now, each then callback returns the subsequent promise, effectively "chaining" them together. The value resolved from each promise is then available as the argument to the next then callback in the sequence.

By adopting this technique, you can improve the readability and maintainability of your code, especially when working with multiple API requests.

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