Sometimes, we want to use an authorization header with fetch in React Native.

In this article, we’ll look at how to use an authorization header with fetch in React Native.

How to use an authorization header with fetch in React Native?

To use an authorization header with fetch in React Native, we set the headers option when we call fetch.

For instance, we write

fetch(url, {
  method: "post",
  headers: new Headers({
    Authorization: "Basic " + btoa("username:password"),
    "Content-Type": "application/x-www-form-urlencoded",
  }),
  body: "foo=1&bar=2",
});

to call fetch with an object with some request options to make a request.

In the object we set the request method to 'post'.

And we set the headers to a Headers object to set the request headers.

In the object we pass into Headres, we set the Authorization header by setting the Authorization property.

And we set the Content-Type header the same way.

We set the body to the request body.

Conclusion

To use an authorization header with fetch in React Native, we set the headers option when we call fetch.