gistfile1.txt

var pdf = await Myfunction.getPDF(
					fs.readFileSync('/recipePDF.html', 'utf8').toString(),
					{
						data: info
					},
					fs.readFileSync('/helpers.js', 'utf8').toString(),
					'',
					''
				)
				res.contentType('application/pdf');
				res.header('Content-Disposition": "filename=reportBIG.pdf"');
				res.status(200);
				pdf.pipe(res);

jsreport.config.json

{
  "extensions": {
   
    "authentication": {
      "cookieSession": {
        "secret": "000000"
      },
    "admin": {
      "username": "admin",
      "password": "0000"
    },
    "enabled": true
    },
    "scripts": {
      "timeout": 9400000,
      "strategy": "http-server"
    },
    "express":{
      "inputRequestLimit":"5000mb",
      "renderTimeout":9400000
    },
    "phantom-pdf":{
      "timeout":9400000
    },
    "xlsx":{
      "escapeAmp":true,
      "numberOfParsedAddIterations":50,
      "addBufferSize":50000000
    },
    "sample-template": {
      "createSamples": true
    }
  },

  "httpPort": 5488,
  "store": {
    "provider": "memory"
  },
  "blobStorage": {
    "provider": "memory"
  },
  "logger": {
    "console": {
      "transport": "console",
      "level": "debug"
    },
    "file": {
      "transport": "file",
      "level": "info",
      "filename": "logs/reporter.log"
    },
    "error": {
      "transport": "file",
      "level": "error",
      "filename": "logs/error.log"
    }
  },
  "allowLocalFilesAccess": true,
  "templatingEngines": {
    "timeout":9400000,
    "strategy": "http-server"
  },
  "chrome": {
    "timeout": 9400000
  },
  "Phantom": {
    "timeout": 9400000
  },
  "reportTimeout":960000
}

MyFunction.js

var getPDF = async (template, data, helpers = '', header = '', footer = '') => {
    try {
        return client.render({
            template: {
                content: template,
                recipe: 'phantom-pdf',
                engine: 'handlebars',
                helpers: helpers,
                phantom: {
                    header: header,
                    footer: footer,
                    format: 'Letter',
                    orientation: 'portrait',
                    headerHeight: "2.5 cm",
                    footerHeight: "1 cm",
                    margin: {
                        "top": "1 cm",
                        "left": "0.5 cm",
                        "right": "0.5 cm",
                        "bottom": "1 cm"
                    },timeout: 9480000
                }
            },
            data: data,
            options: {
                reports: {
                    "save": true
                }
            },
        });
    } catch (error) {return error;}
};