writetofile.js

const newman = require('newman'); // require newman in your project
const fs = require('fs');
let logs = [];
// call newman.run to pass `options` object and wait for callback
newman.run({
    collection: require('./mock2.postman_collection.json'),
    reporters: ['cli','json' , 'htmlextra'],
    environment: 'WebGUI_URL.postman_environment.json',
	reporter: {
        htmlextra: {
            export: './report.html',
            // template: './template.hbs'
            logs: true,
            // showOnlyFails: true,
            noSyntaxHighlighting: true,
            testPaging: true,
            // browserTitle: "My Newman report",
            title: "Sports Data Odds",
            // titleSize: 4,
            omitHeaders: true,
            // skipHeaders: "Authorization",
            // omitRequestBodies: true,
            // omitResponseBodies: true,
            // hideRequestBody: ["Login"],
            // hideResponseBody: ["Auth Request"],
            // showEnvironmentData: true,
            // skipEnvironmentVars: ["API_KEY"],
            // showGlobalData: true,
            // skipGlobalVars: ["API_TOKEN"],
            // skipSensitiveData: true,
            // showMarkdownLinks: true,
            // showFolderDescription: true,
            // timezone: "Australia/Sydney",
            // skipFolders: "folder name with space,folderWithoutSpace",
            // skipRequests: "request name with space,requestNameWithoutSpace"
        }
    }
	
}).on('start', function (err, args) { // on start of run, log to console
    console.log('start');
}).on('console', function (err, args) {
    if (err) { return; }
    logs.push(args.messages);
}).on('done', function (err, summary) {
    if (err || summary.error) {
        console.error('collection run encountered an error.');
    }
    else {
        console.log('collection run completed.');
    }
    fs.writeFileSync("results.txt", logs.join("\r\n"));
})
.on('request', (error, data) => {
    
    if (error) {
        console.log(error);
        return;
    }

    const requestName = data.item.name.replace(/[^a-z0-9]/gi, '-');
    const randomString = Math.random().toString(36).substring(7);
    const fileName = `response-${requestName}-new.txt`;
    const content = data.response.stream.toString();
    
    fs.writeFile(fileName, content, function (error) {
        if (error) { 
             console.error(error); 
        }
     });

     /// TODO: all global error handling
});