How do I send a POST request using JavaScript?

To send a POST request using vanilla JavaScript, you must use an XMLHttpRequest object to interact with the server and provide the correct Content-Type request header for the POST message body data. In this JavaScript POST request example, the Content-Type: application/json header indicates that the body of the POST message contains JSON, and the Accept: application/json request header tells the server that the client is expecting a JSON in response. You can also send a post request using the new Fetch API method. jQuery users can send post requests using the jQuery.post() method.
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