Newman - Logging request and response body

writeToDisk.js

const newman = require('newman');

newman.run({
    collection: require('./postman_collection.json'),
    reporters: 'cli'
}).on('beforeRequest', function (error, args) {
    if (error) {
        console.error(error);
    } else {
        // Log the request body
        console.log(args.request.body.raw);
    }
}).on('request', function (error, args) {
    if (error) {
        console.error(error);
    }
    else {
        // Log the response body
        console.log(args.response.stream.toString());
    }
});