# Developing MainNet library

Download and install dependencies.

git clone https://github.com/mainnet-cash/mainnet-js.git
cd mainnet-js
yarn install
yarn build # build the mainnet library
yarn api:serve:install # install the library on the express server

Run the server in single threaded mode:

yarn api:serve

or in cluster mode:

PORT=3000 WORKERS=5 yarn api:serve:cluster

On MacOS if you get gyp: No Xcode or CLT version detected! you might want to follow this article (opens new window).