How to send a file to a server and monitor its upload progress using JavaScript?

Sending Files in JavaScript

Suppose you have an HTML element representing a button that lets users select a file. Upon clicking the button and choosing a file, its name is stored in document.getElementById("image-file").value. If the server supports multi-part POST requests at the URL "/upload/image," how do you send the file to that endpoint? Additionally, how do you monitor the upload's progress?

Pure JavaScript with Fetch

You can use the fetch API with optional await-try-catch handling:

Example with Async-Try-Catch

This example also includes user data sent as JSON:

Monitoring Upload Progress

Unfortunately, methods like request.onprogress are not supported in HTML5 file upload with fetch, but you can monitor the overall upload progress by listening to network events:

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