In the LC example, we will use Hyperledger Composer to work on our business network code and smart contract logic. For this, you can choose your preferred IDE, but for our example we will use Visual Studio Code. From https://code.visualstudio.com, download and install Visual Studio Code.

Open Visual Studio Code and navigate to View | Extensions, and search for and install the Hyperledger Composer extension. It will help you to write a composer's model files and report errors for you easily, as demonstrated in the following screenshot:

If you don't want to use an IDE, you can continue using your favorite text editor.