How to Execute Server-Side Functions from an HTML Page with Express.js and Fetch

Описание: Learn how to trigger server-side functions on an Express.js server by clicking a button in an HTML page using the Fetch API.
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This video is based on the question https://stackoverflow.com/q/77023756/ asked by the user 'DanilTi' ( https://stackoverflow.com/u/20530475/ ) and on the answer https://stackoverflow.com/a/77023830/ provided by the user 'WKoA' ( https://stackoverflow.com/u/22483970/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Execute Server-Side Functions from an HTML Page with Express.js and Fetch

In the world of web development, interactivity is key. A common requirement is the ability to perform actions on the server side when a user interacts with the webpage—like clicking a button. This guide will show you how to achieve this using Express.js and the Fetch API.

The Problem: Triggering Server Functions from a Button Click

Suppose you want a function on your server to execute whenever a user clicks a button on your HTML page. This requirement is often met using a combination of HTML, JavaScript, and a backend framework like Express.js. Below, we'll walk through how to set this up effectively.

The Solution: Step-by-Step Implementation

To accomplish our goal, we need to follow these key steps:

1. Setting Up Your Server with Express.js

First, ensure that you have Express.js installed and set up properly. You can install it using npm:

[[See Video to Reveal this Text or Code Snippet]]

Now, let’s create a simple server.

Code Breakdown:

[[See Video to Reveal this Text or Code Snippet]]

2. Creating Your HTML Page

Now, let’s create an index.html file that will serve as the user interface. This file will contain a button that triggers the server action when clicked.

Sample HTML Code:

[[See Video to Reveal this Text or Code Snippet]]

3. Running Your Application

Start your server by running node server.js in your terminal.

Open your index.html file in a web browser.

Click the button to trigger the server function.

Final Thoughts

By linking your frontend's button click event to your server's functionality through the Fetch API, you can easily develop interactive web applications where users can trigger server-side actions seamlessly.

Make sure to adjust your server configurations and client API calls according to your deployed server’s settings for production applications.

Now you have a clear understanding of how to execute server-side functions from an HTML page using Express.js and Fetch API! Happy coding!