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- Await Fetch Js
- Await Fetch
- Await Fetch Error
- Await Fetch Catch
- Await Fetch Js
- Await Fetch React
- Await Fetch React
Summary: in this tutorial, you’ll learn about the JavaScript Fetch API and how to use it to make asynchronous HTTP requests.
The Fetch API is a modern interface that allows you to make HTTP requests to servers from web browsers.
Use async/await in React with Fetch; handle errors with Fetch and async/await; Disclaimer. React is changing fast and and the method exposed here could be already obsolete by the time you'll see this article, originally wrote in June 2018. Take the post with a grain of salt. Await substitutes for.then, so when using await fetch, you don't need to use.then at all. Here are a couple other answers which deal with more or less the same issue: 1 - How can I acces the values of my async fetch function? duplicate 2 - Fetch API Using Async/Await Return Value Unexpected duplicate.
If you have worked with
XMLHttpRequest
(XHR
) object, the Fetch API can perform all the tasks as the XHR
object does.In addition, the Fetch API is much simpler and cleaner. It uses the
Promise
to deliver more flexible features to make requests to servers from the web browsers.The
fetch()
method is available in the global scope that instructs the web browsers to send a request to a URL.Sending a Request
The
fetch()
requires only one parameter which is the URL of the resource that you want to fetch:The
fetch()
method returns a Promise
so you can use the then()
and catch()
methods to handle it:When the request completes, the resource is available. At this time, the promise will resolve into a
Response
object.The
Response
object is the API wrapper for the fetched resource. The Response
object has a number of useful properties and methods to inspect the response.Reading the Response
If the contents of the response are in the raw text format, you can use the
text()
method. The text()
method returns a Promise that resolves with the complete contents of the fetched resource:Await Fetch Js
In practice, you often use the
async
/await
with the fetch()
method like this:Besides the
text()
method, the Response
object has other methods such as json()
, blob()
, formData()
and arrayBuffer()
Powertunes 1 4 3 x 5. to handle the respective type of data.Handling the status codes of the Response
The
Response
object provides the status code and status text via the status
and statusText
properties. When a request is successful, the status code is 200
and status text is OK
:Output:
If the requested resource doesn’t exist, the response code is
404
:Output:
If the requested URL throws a server error, the response code will be
500
.If the requested URL is redirected to the new one with the response
300-309
, the status
of the Response
object is set to 200
. In addition the redirected
property is set to true
.The
fetch()
returns a promise that rejects when a real failure occurs such as a web browser timeout, a loss of network connection, and a CORS violation.JavaScript Fetch API example
Await Fetch
Suppose that you have a json file that locates on the webserver with the following contents:
Await Fetch Error
The following shows the HTML page:
In the
app.js
, we’ll use the fetch()
method to get the user data and render the data inside the <div>
element with the class container
.First, declare the
getUsers()
function that fetches users.json
from the server.Await Fetch Catch
Then, develop the
renderUsers()
function that renders user data:Await Fetch Js
Check it out the Fetch API demo.
Await Fetch React
Summary
Await Fetch React
- The Fetch API allows you to asynchronously request for a resource.
- Use the
fetch()
method to return a promise that resolves into aResponse
object. To get the actual data, you call one of the methods of the Response object e.g.,text()
orjson()
. These methods resolve into the actual data. - Use the
status
andstatusText
properties of theResponse
object to get the status and status text of the response. - use the
catch()
method ortry..catch
statement to handle a failure request.
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