var Quagga = require('../lib/quagga').default; var buffer = require('fs').readFileSync('../test/fixtures/code_128/image-001.jpg'); decode(buffer); function decode(buff){ Quagga.decodeSingle({ src: buff, numOfWorkers: 0, inputStream: { mime: "image/jpeg", size: 800, area: { top: "10%", right: "5%", left: "5%", bottom: "10%" } } }, function(result) { if (result.codeResult) { console.log("result", result.codeResult.code); } else { console.log("not detected"); } }); }