In web development, there is only one “front end” language, and that’s JavaScript (and things compiled to JavaScript, like TypeScript). Everything else runs on a server somewhere, not in the browser, and that makes it “back end”. Flask, which is written in Python, is back end .18 May 2017
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Flask is used for the backend , but it makes use of a templating language called Jinja2 which is used to create HTML, XML or other markup formats that are returned to the user via an HTTP request.10 Oca 2020
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