Steps to create Express application

Step 1: In the first step, we will create the new folder by using the below command in the VScode terminal.

mkdir folder-name
cd folder-name

Step 2: After creating the folder, initialize the NPM using the below command. Using this the package.json file will be created.

npm init -y

Step 3: Now, we will install the express dependency for our project using the below command.

npm i express

Step 4: Now create the below Project Structure of our project which includes the file as app.js and public directory in which images are stored.

Project Structure:

The updated dependencies in package.json file will look like:

"dependencies": {
    "express": "^4.18.2"
}

In Express.js applications, we can set the response headers on assets to improve performance and also control the cache behavior.

In this article, we will set the response header on Express.js assets by using 2 different approaches. We will see the practical implementation of this approach in terms of examples and output.

The following approaches will be used to set response header in Express