node js request async await
Explanation of async/await in Node.js
Async/await is a feature in Node.js that allows you to write asynchronous code in a more synchronous and readable manner. It is built on top of Promises and provides a way to write asynchronous code that looks and behaves like synchronous code.
Here is an explanation of each step involved in using async/await in Node.js:
Declare an async function: To use async/await, you need to declare an async function. An async function is a function that can pause and resume its execution, allowing other code to run in the meantime. You declare an async function by using the
async
keyword before the function declaration.Use the
await
keyword: Inside an async function, you can use theawait
keyword to pause the execution of the function until a Promise is resolved. Theawait
keyword can only be used inside an async function.Call a function that returns a Promise: To use
await
, you need to call a function that returns a Promise. Theawait
keyword will pause the execution of the async function until the Promise is resolved or rejected. Once the Promise is resolved, the value of the resolved Promise is returned.Handle errors: When using
await
, it is important to handle any errors that may occur. You can use atry/catch
block to catch and handle any errors that are thrown inside the async function.
Here is an example of how async/await can be used in Node.js:
async function fetchData() {
try {
const response = await fetch('https://api.example.com/data');
const data = await response.json();
console.log(data);
} catch (error) {
console.error('Error:', error);
}
}
fetchData();
In this example, the fetchData
function is declared as an async function. Inside the function, the await
keyword is used to pause the execution of the function until the fetch
request is resolved. Once the request is resolved, the response is converted to JSON using response.json()
, and the data is logged to the console.
If an error occurs during the execution of the async function, it will be caught and logged to the console using the catch
block.
Please note that the fetch
function used in this example is a browser API and may not be available in Node.js by default. You can use libraries like node-fetch
or axios
to make HTTP requests in Node.js.