How do I chain promises in Node.js?

How do I chain promises in Node.js?

Chaining promises in Node.js allows you to execute asynchronous operations in sequence. You can do this using the .then() method.

Can you give me an example of chaining promises?

Sure! Here's a simple example:

function firstTask() {
    return new Promise((resolve) => {
        setTimeout(() => resolve('First task completed!'), 1000);
    });
}

function secondTask(message) {
    return new Promise((resolve) => {
        setTimeout(() => resolve(`${message} Second task completed!`), 1000);
    });
}

firstTask()
    .then(result => secondTask(result))
    .then(finalResult => console.log(finalResult));

What happens if one of the promises fails?

If one of the promises fails, the error will be caught in the chain. You can handle it using .catch(). For example:

firstTask()
    .then(result => secondTask(result))
    .catch(error => console.error('Error:', error));