How to route pages on the Electron?

Question

I have an application in Electron with several HTML files and I would like to create routes in Electron as well as in Express. For example, on the home page of the application the user should log in, as in the code below:

<form action="login.html" method="get">
    <input class="data_field" type="text" name="username" placeholder="Username"/>
    <input class="data_field" type="password" name="password" placeholder="Password"/>
    <input class="button" type="submit" value="Login"/>
</form>

In this code above, the application redirects directly to the other HTML page where validations will be made and others, but that’s not what I want.

I want to send the form through a route that is not this HTML file, and with pure JS I want to capture the request, validate the information and only after that, return a new HTML file as if it were a server. How can I do this kind of thing on the Electron?

// Um código de exemplo do que eu quero fazer no Electron
electron.post("/login", (request, response) => {
    const username = request.body.username;
    const password = request.body.password;
    
    if (database[username] && database[username].password === password) {
        response.sendFile("myHTMLFile.html");
    } else {
        response.sendFile("otherFile.html");
    }
});

<form action="/login" method="post">
    <input class="data_field" type="text" name="username" placeholder="Username"/>
    <input class="data_field" type="password" name="password" placeholder="Password"/>
    <input class="button" type="submit" value="Login"/>
</form>