What is the Fetch API?
The Fetch API in Node.js is a modern JavaScript API that provides a simplified interface for making HTTP requests. It is a promise-based API, which means that it returns a promise that resolves to a response object. The response object contains the response data, headers, and status code.
The Fetch API is available in all modern browsers and Node.js versions starting from v17.0.
How to use the Fetch API in Node.js
To use the Fetch API in Node.js, you can use the fetch() method. The fetch() method takes a URL as its only required argument. It provides a promise that resolves to an answer object as a result..
Here is an example of how to use the Fetch API to fetch a JSON file from a remote server:
const url = "https://api.example.com/data.json";
const response = await fetch(url);
const data = await response.json();
console.log(data);
This code will first fetch the JSON file from the specified URL. Then, it will parse the JSON data and log it to the console.
Common methods of the Fetch
The Fetch API provides a number of common methods that you can use to interact with HTTP requests and responses. The following are a few of the most popular methods:
fetch(): This method is used to make an HTTP request.then(): This method is used to handle the successful completion of an HTTP request.catch(): This method is used to handle the failure of an HTTP request.headers(): This method is used to get or set the headers of an HTTP request or response.body(): This method is used to get or set the body of an HTTP request or response.status(): This method is used to get the status code of an HTTP response.
Example of using the Fetch with common methods
Here is an example of how to use the Fetch API with common methods:
const url = "https://api.example.com/data.json";
const response = await fetch(url);
if (response.ok) {
const data = await response.json();
console.log(data);
} else {
console.log(`Error: ${response.status}`);
}
This code will first fetch the JSON file from the specified URL. Then, it will check the status code of the response. If the status code is 200 (OK), then the code will parse the JSON data and log it to the console. Otherwise, the code will log an error message.
Conclusion
The Fetch API is a powerful tool that can be used to make HTTP requests in Node.js. It is a promise-based API, which makes it easy to use and chain together multiple requests. The Fetch API also provides a number of common methods that you can use to interact with HTTP requests and responses.
