SimiTech (2026)

21/06/2023

Import and Export in vanilla JavaScript

04/06/2023

What is a promise in JavaScript?

In JavaScript, a promise is an object that represents the eventual completion (or failure) of an asynchronous operation and its resulting value. It is a way to handle asynchronous operations in a more organized and readable manner. Promises are used to work with asynchronous code, such as making HTTP requests, reading or writing to a file, or performing database queries. They provide a cleaner alternative to using callbacks for handling the result of asynchronous operations.

The main idea behind promises is that they allow you to chain multiple asynchronous operations together and handle their results using methods like .then() and .catch(). The .then() callback is executed, logging the fulfilled value (data), and the .catch() callback will be triggered, logging the rejection reason (error).

JavaScript provides a built-in API for making HTTP requests called fetch(). The fetch() function returns a promise object that represents the eventual completion (or failure) of the HTTP request. When making an HTTP request using fetch(), two .then() methods are typically used.

The first .then() method converts the response to JSON format using the json() method, which returns another promise. This promise is resolved with the parsed JSON data from the response.

The second .then() method logs the JSON data or performs further processing with it.

Example.

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