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//Schema for storing accounts in database
var userSchema = new mongoose.Schema({
    name: String,
    email: String,
    password: String
});

var User = mongoose.model("User", userSchema);

app.get("/login", function(req, res){
    res.render("login");
});

app.get("/signup", function(req, res){

    var errors = "";

    res.render("signup", {
        errors: errors
    });
});

//Submission for signup page
app.post("/signup", function(req, res){
    
    var errors = [];

    if(req.body.password.length < 8){
        errors.push("Password must be at least 8 characters");
    }else if(req.body.password != req.body.password2){
        errors.push("Passwords must match");
    }

    if(errors.length > 0){
        res.render("signup", {
            errors: errors,
            name: req.body.name,
            email: req.body.email,
            password: req.body.password,
            password2: req.body.password2
        })
    }else{
        res.send("User created!");
    }

});

      <h4 style="color: red"><%= errors %></h4>