How do you make a post request via Fetch in Nativescript?

Question

I have a server.js file. With a post request (/login). It looks like this:

require('dotenv').config();
const express = require('express');
const mysql = require('mysql')
const app = express();
const PORT = process.env.PORT || 3000
app.listen(PORT, console.log(`Server started on port ${PORT}`))


app.post('/login', (req, res) => {
    console.log("login")
    console.log(req);
})

I also have a function in NativeScript that is supposed to make a post request (where the fetch is) when a button is pressed. It looks like this:

export function onLoginButtonTap() {
    console.log("login button tapped")
    const frame = Frame.getFrameById("mainFrame");

    // TODO: user authentication
    var userEmail = `${bindingContext.get('email')}`;
    var userPassword = `${bindingContext.get('password')}`;

    // make sure fields are filled out
    if (userPassword === "" || userEmail === "") {
        alert({
            title: "Login Error",
            message: "One or more fields is empty. Please fill in every field.",
            okButtonText: "OK",
        })
    } else {
        // TODO: post request (send user input to backend for verification)
        console.log("here1")
        const data = {userEmail, userPassword};
        const options = {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(data)
        }
        fetch("http://localhost:3000/login", options);
    
        // if user is in database change page to home
        frame.navigate("pages/home/home-page");
    }

    // navigates to home page without requiring login info (for testing)
    frame.navigate("pages/home/home-page");
}

The post request doesn't work. I would like the console.logs in the server file to print the request. I think the problem is how I wrote the post request? Currently nothing happens.

Answer 1

Fetch return a promise, you need to resolve it to actually make the POST request. Try the following block of code.

fetch('http://localhost:3000/login', options)
          .then((response) => response.json())
          .then((result) => {
            console.log('Success:', result);
          })
          .catch((error) => {
            console.error('Error:', error);
          });