How to pass variables to the next middleware using next() in Express.js ?
The following example covers how to pass variables to the next middleware using next() in Express.js.
We cannot directly pass data to the next middleware, but we can send data through the request object.
[Middleware 1] [Middleware 2]
request.mydata = someData; ——-> let dataFromMiddleware1 = request.mydata;
Installation of Express module:
You can visit the link Install express module. You can install this package by using this command.
npm install express
After that, you can just create a folder and add a file for example index.js, To run this file you need to run the following command.
Steps to run the program:
Run the index.js file using the following command:
We will see the following output on the console:
Server is up and running on 5000 ...
Now open the browser and go to http://localhost:5000/, you will see the following output on screen:
Now again check the terminal output, it will look like the following:
Server is up and running on 5000 ... We are in Middleware 2. Data of Middleware 1