The Fetch API uses Request and Response objects (and other things involved with network requests), as well as related concepts such as CORS and the HTTP Origin header semantics.
For making a request and fetching a resource, use the fetch() method. It is a global method in both Window and Worker contexts. This makes it available in pretty much any context you might want to fetch resources in.
The fetch() method takes one mandatory argument, the path to the resource you want to fetch. It returns a Promise that resolves to the Response to that request — as soon as the server responds with headers — even if the server response is an HTTP error status. You can also optionally pass in an init options object as the second argument (see Request).
Once a Response is retrieved, there are a number of methods available to define what the body content is and how it should be handled.
You can create a request and response directly using the Request() and Response() constructors, but it's uncommon to do this directly. Instead, these are more likely to be created as results of other API actions (for example, FetchEvent.respondWith() from service workers).
Find out more about using the Fetch API features in Using Fetch, and study concepts in Fetch basic concepts.
FAQs
The Fetch API is a feature that allows you to make HTTP requests (such as GET, POST, PUT, or DELETE) to a web server. It's built into modern browsers, so you don't need additional libraries or packages to use it.
What is fetch API vs REST API? ›
Some of the differences include: Fetch is a function which takes a REST API url in its call. REST APIs can accept headers like for Authentication but Fetch call be called by any javascript in the browser and in fact passes these headers while calling the REST APIs.
How to fetch data from APIs? ›
To Get data using the Fetch API in JavaScript, we use the fetch() function with the URL of the resource we want to fetch. By default, the fetch method makes the Get request.
What is GET vs FETCH in API? ›
When comparing the syntax of GET and FETCH operations, it's essential to understand their context within HTTP requests. GET is a method used to retrieve data from a specified resource, while FETCH is a modern API in JavaScript that provides a more powerful and flexible feature set for making HTTP requests.
What is the difference between fetch and promise? ›
The global fetch() method starts the process of fetching a resource from the network, returning a promise that is fulfilled once the response is available. The promise resolves to the Response object representing the response to your request.
Why is Fetch API better? ›
The Fetch API provides an interface for fetching resources (including across the network). It is a more powerful and flexible replacement for XMLHttpRequest .
Is Fetch API and Ajax same? ›
In contrast to traditional AJAX calls that generate an error when an HTTP error is encountered, The Fetch API only rejects a promise when there is a network failure. This means that HTTP errors like 500 or 404 won't cause the fetch promise to reject.
What is the difference between rest API and web API? ›
REST APIs use the HTTP protocol to send and receive data. Web APIs, on the other hand, rely on multiple communication protocols like SOAP, XML-RPC, and JSON-RPC. REST APIs are the most widely used for data integration, facilitating efficient data transfer.
Is Fetch API synchronous or asynchronous? ›
Fetch API is an asynchronous web API that comes with native JavaScript, and it returns the data in the form of promises. You use several Web APIs without knowing that they are APIs. One of them is the Fetch API, and it is used for making API requests. Let's take a look at it.
Does Fetch API set cookies? ›
On modern browsers, fetch() now sends cookies by default if the origin of the endpoint and the origin of the calling script are the same. The value of credentials is no longer "omit" but now "same-origin" .
- 1 Register a Web API. Click the Create button (top right) in the data integration workspace and select the type REST request. ...
- 2 Create a JSON parser. ...
- 3 Create a JSON Dataset. ...
- 4 Create a Knowledge Graph. ...
- 5 Create a Transformation. ...
- 6 Create a Workflow.
In order to turn a website into an API, you first need a web scraper. A web scraper is a tool that automates the process of extracting data from websites, in the form of HTML code, and converts it into a usable structured format – either in a spreadsheet, like with Visualping's Google Sheets integration, or in an API.
How do I pass data in Fetch API? ›
How to use Fetch API with the PUT method
- Prepare the data you want to update. Before making the API request, you need to prepare the data you want to send to the server. ...
- Convert the data to a JSON string. Before sending the data to the server, we need to convert it into a JSON string. ...
- Use the Fetch API to make the request.
The Fetch API provides a JavaScript interface for accessing and manipulating parts of the protocol, such as requests and responses. It also provides a global fetch() method that provides an easy, logical way to fetch resources asynchronously across the network.
Is fetch API and REST API same? ›
fetch is a Javascript API which is implemented by all major browsers, allowing scripts to make HTTP requests. This is basically a replacement for the old XmlHttpRequest API which offers an improved developer experience. REST is a 'style' of web based API implemented by many microservices.
How to fetch data through API? ›
Fetch Method : The fetch() method in JavaScript is used to request data from a server. The request can be of any type of API that returns the data in JSON or XML. The fetch() method requires one parameter, the URL to request, and returns a promise.
Can you chain fetch requests? ›
One way to fetch data from multiple endpoints is by chaining multiple fetch requests together. In this approach, you make a fetch request to the first endpoint and then use the response from that request to make another fetch request to the next endpoint.
What is the difference between fetch and await? ›
In testing, both seem to work. If you just return fetch(url) it'll stream the response back, if you return await fetch(url) it'll wait and then return it. No difference to the end user. To you as a dev, if it was to fail for some reason then you could catch the exception if you awaited and handle as you wish.
What is push vs fetch? ›
Fetch New Data is a feature that allows the user to select how often the device checks for new email. Push is a feature that's only available with certain email accounts that automatically push email to the device. Push requires more power and may have an effect on battery life. on your Apple® iPad®.
Is an API a web application? ›
A Web API or Web Service API is an application processing interface between a web server and web browser. All web services are APIs but not all APIs are web services. REST API is a special type of Web API that uses the standard architectural style explained above.
The JavaScript Fetch API sends and receives data between applications like all other APIs. The Fetch API is a modern interface that allows developers to make HTTP requests to servers from web browsers.
Is fetch a HTTP client? ›
A http client wrapper for Fetch API with middleware support.
What is web API in JavaScript? ›
A Web API is an application programming interface for the Web. A Browser API can extend the functionality of a web browser. A Server API can extend the functionality of a web server.
