This code will convert an image to three different sizes in parallel. It’s much quicker than processing each size sequentially.

npm install sharp

Next, place a large image in your working directory and name it image.jpg

node resize-main.js image.jpg

You should see all three “Resizing” messages appear instantaneously. The main thread iterates over the requested sizes, creates a new thread for each one, and waits until they complete. This ensures the sizes are generated in parallel, without blocking the main thread.

The example relies on the popular ffmpeg encoder. The fluent-ffmpeg package is a Node.js wrapper around the existing ffmpeg libraries on your system. You’ll need to [install ffmpeg before you can run your code. Most Linux environments will already include it, but Windows and Mac users may need to get it manually.

Install instractions:

https://snyk.io/blog/node-js-multithreading-with-worker-threads/

Create a simple text file in your working directory, ready to encrypt, using the following command in your terminal:

echo foobar > demo.txt

Now execute your code to encrypt the file:

node encrypt-main.js demo.txt