Building a SPA (Single-page Application) is a complex puzzle: a JavaScript framework that draws the view, an API serving JSON, and 2 independent codebases forced to understand each other through contracts. It is an accepted, professionalized scenario. But being a standard does not make it the only way. I want to show you another approach, one that is not new but has gained traction over the years: HTML over WebSockets . The idea is this: instead of sending JSON and assembling the HTML in the browser, the server sends the HTML already built and the client just places it where it belongs. All the rendering logic stays in the Back-End, in a single language, with no need for contracts or an API. This pattern is known as hypermedia or HTML over the wire . What matters about how the HTML travels is that it determines the latency and the bidirectionality of the communication. There are three variants: Over HTTP , request by request, like htmx or Unicorn .…