Sorry for the delay, internet in this country is just plain shit and the video was about 3.6GB :) This video covers how you can use both symfony 4 and ajax (XMLHttpRequest) together in a coherent way, this includes both how to send data from the back-end in json format (Serialization) and how to get back in the javascript section as a json response (JSON.parse(data)), otherthing this video goes through: - Setting up symfony encore for assets management - Installing & setting up FOS JS Routing to handle generating urls from the javascript files, also covers how to expose, debug and dump the routes - How to serialize objects into json format and - Covers how you can get around CircularReference Error in doctrine when serializing - Creating AJAX requests : GET, POST, DELETE .. - Creating a progress bar to display the progress in percentage (ProgressEvent), file download example - Basic usage of promises instead of callback to avoid callbacks hell - Listene for various events and send ajax request to the controller Github repository: https://github.com/konshensx16/symfon-ajax