Use npm to install the module:

npm install easyly

The package needs to be configured with your account's secret key, which is available in the Easyly Dashboard. Require it with the key's value:

const easyly = require('easyly')('sk_test_...');

easyly.leads.create({
    name: 'John Doe',
    email: 'john@example.com',
})
    .then(lead => console.log(lead.id))
    .catch(error => console.error(error));

If you would like to contribute to Easyly, please make sure to read our contributor guidelines.