javascript-fetch tagged requests and articles
Categorized request examples and articles tagged with [javascript-fetch] keyword How to send Bearer Token with JavaScript Fetch API?
To send a Bearer Token in an Authorization header to a server using the JavaScript Fetch API, you must pass the "Authorization: bearer {token}" HTTP header to the fetch() method using the "headers" parameter. Bearer Token is an encrypted string returned by the server and stored on the user's computer that authenticates the user to access protected resources on the server. You must pass a Bearer Token to the fetch() method for every request you make to a protected resource. In this JavaScript Fetch API Bearer Token example, we send a request with an Authorization header to the ReqBin echo URL using the fetch() method. Click Execute to run the JavaScript Fetch API Bearer Token Authorization Header example online and see the result.
How do I fetch JSON using JavaScript Fetch API?
To fetch JSON from the server using the Fetch API, you need to use the JavaScript fetch() method and then call the response.json() method to get the JSON data as a JavaScript object. The response.json() method reads the data returned by the server and returns a Promise that resolves with a JSON object. If you are expecting a text, call the response.text() method. For some servers, you must also send the "Accept: application/json" header to get the response in JSON format. In this JavaScript Fetch JSON example, we retrieve a JSON from the ReqBin echo URL using the fetch() method. Click Execute to run the JavaScript Fetch JSON Example online and see the result.
How to send Authorization Credentials with JavaScript Fetch API?
To send authorization credentials using the Fetch API in JavaScript, you need to allow the credentials to be sent to the server by adding the «credential: 'include'» parameter when calling the fetch() method. Default Fetch API requests do not contain user credentials such as cookies and HTTP authentication headers. This is done for security reasons because user authentication data allows JavaScript to act on behalf of the user and obtain private information. If you want to send credentials only to the original domain, use the «credentials: 'same-origin'» parameter. To prevent the browser from sending credentials at all, use the «credentials: 'omit'» option. In this JavaScript Fetch API with Credentials example, we send a request with «credential: 'include'» parameter to the ReqBin echo URL using the fetch() method. Click Execute to run the JavaScript Fetch API with Credentials example online and see the result.
How to send headers with JavaScript Fetch API?
To send HTTP headers to the server using the JavaScript Fetch API, you can pass these headers with the "options" parameter to the fetch(URL, options) method. The headers are passed in the "key: value" format and may override some standard HTTP headers or pass new ones. Not all default HTTP headers can be overridden for Fetch API requests; for example, you can override the Content-Type header, but you cannot override the Content-Length header. In this JavaScript Fetch API Headers example, we send a request with a Content-Type header to the ReqBin echo URL using the fetch() method. Click Execute to run the JavaScript Fetch Headers example online and see the result.
To send a Bearer Token in an Authorization header to a server using the JavaScript Fetch API, you must pass the "Authorization: bearer {token}" HTTP header to the fetch() method using the "headers" parameter. Bearer Token is an encrypted string returned by the server and stored on the user's computer that authenticates the user to access protected resources on the server. You must pass a Bearer Token to the fetch() method for every request you make to a protected resource. In this JavaScript Fetch API Bearer Token example, we send a request with an Authorization header to the ReqBin echo URL using the fetch() method. Click Execute to run the JavaScript Fetch API Bearer Token Authorization Header example online and see the result.
How do I fetch JSON using JavaScript Fetch API?
To fetch JSON from the server using the Fetch API, you need to use the JavaScript fetch() method and then call the response.json() method to get the JSON data as a JavaScript object. The response.json() method reads the data returned by the server and returns a Promise that resolves with a JSON object. If you are expecting a text, call the response.text() method. For some servers, you must also send the "Accept: application/json" header to get the response in JSON format. In this JavaScript Fetch JSON example, we retrieve a JSON from the ReqBin echo URL using the fetch() method. Click Execute to run the JavaScript Fetch JSON Example online and see the result.
How to send Authorization Credentials with JavaScript Fetch API?
To send authorization credentials using the Fetch API in JavaScript, you need to allow the credentials to be sent to the server by adding the «credential: 'include'» parameter when calling the fetch() method. Default Fetch API requests do not contain user credentials such as cookies and HTTP authentication headers. This is done for security reasons because user authentication data allows JavaScript to act on behalf of the user and obtain private information. If you want to send credentials only to the original domain, use the «credentials: 'same-origin'» parameter. To prevent the browser from sending credentials at all, use the «credentials: 'omit'» option. In this JavaScript Fetch API with Credentials example, we send a request with «credential: 'include'» parameter to the ReqBin echo URL using the fetch() method. Click Execute to run the JavaScript Fetch API with Credentials example online and see the result.
How to send headers with JavaScript Fetch API?
To send HTTP headers to the server using the JavaScript Fetch API, you can pass these headers with the "options" parameter to the fetch(URL, options) method. The headers are passed in the "key: value" format and may override some standard HTTP headers or pass new ones. Not all default HTTP headers can be overridden for Fetch API requests; for example, you can override the Content-Type header, but you cannot override the Content-Length header. In this JavaScript Fetch API Headers example, we send a request with a Content-Type header to the ReqBin echo URL using the fetch() method. Click Execute to run the JavaScript Fetch Headers example online and see the result.