ByteScout Cloud API Server – Barcode Reader API – JavaScript – Read Barcode From Uploaded File (Node.js)

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ByteScout Cloud API Server – Barcode Reader API – JavaScript – Read Barcode From Uploaded File (Node.js)

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ByteScout-Cloud-API-Server-JavaScript-Read-Barcode-From-Uploaded-File-(Node-js).pdf

How to read barcode from uploaded file (node for barcode reader API in JavaScript and ByteScout Cloud API Server

Step-by-step tutorial:How to read barcode from uploaded file (node to have barcode reader API in JavaScript

The documentation is written to assist you to apply all the necessary features on your side. ByteScout Cloud API Server was designed to assist barcode reader API in JavaScript. ByteScout Cloud API Server is the ready to use Web API Server that can be deployed in less than 30 minutes into your own in-house server or into private cloud server. Can store data on in-house local server based storage or in Amazon AWS S3 bucket. Processing data solely on the server using buil-in ByteScout powered engine, no cloud services are used to process your data!.

This simple and easy to understand sample source code in JavaScript for ByteScout Cloud API Server contains different functions and options you should do calling the API to implement barcode reader API. Follow the tutorial and copy – paste code for JavaScript into your project’s code editor. Want to see how it works with your data then code testing will allow the function to be tested and work properly.

ByteScout Cloud API Server – free trial version is available on our website. Also, there are other code samples to help you with your JavaScript application included into trial version.

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app.js

      /*jshint esversion: 6 */

// Please NOTE: In this sample we're assuming Cloud Api Server is hosted at "https://localhost". 
// If it's not then please replace this with with your hosting url.

var https = require("https");
var path = require("path");
var fs = require("fs");

// `request` module is required for file upload.
// Use "npm install request" command to install.
var request = require("request");

// Source file name
const SourceFile = "./sample.pdf";
// Comma-separated list of barcode types to search. 
// barcode types
const BarcodeTypes = "Code128,Code39,Interleaved2of5,EAN13";
// Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'.
const Pages = "";

// 1. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE.
getPresignedUrl(SourceFile)
.then(([uploadUrl, uploadedFileUrl]) => {
    // 2. UPLOAD THE FILE TO CLOUD.
    uploadFile(SourceFile, uploadUrl)
    .then(() => {
        // 3. READ BARCODES FROM UPLOADED FILE
        readBarcodes(uploadedFileUrl, Pages, BarcodeTypes);
    })
    .catch(e => {
        console.log(e);
    });
})
.catch(e => {
    console.log(e);
});


function getPresignedUrl(localFile) {
    return new Promise(resolve => {
        // Prepare request to `Get Presigned URL` API endpoint
        let queryPath = `/file/upload/get-presigned-url?contenttype=application/octet-stream&name=${path.basename(SourceFile)}`;
        let reqOptions = {
            host: "localhost",
            path: encodeURI(queryPath)
        };
        // Send request
        https.get(reqOptions, (response) => {
            response.on("data", (d) => {
                let data = JSON.parse(d);
                if (data.error == false) {
                    // Return presigned url we received
                    resolve([data.presignedUrl, data.url]);
                }
                else {
                    // Service reported error
                    console.log("getPresignedUrl(): " + data.message);
                }
            });
        })
        .on("error", (e) => {
            // Request error
            console.log("getPresignedUrl(): " + e);
        });
    });
}

function uploadFile(localFile, uploadUrl) {
    return new Promise(resolve => {
        fs.readFile(SourceFile, (err, data) => {
            request({
                method: "PUT",
                url: uploadUrl,
                body: data,
                headers: {
                    "Content-Type": "application/octet-stream"
                }
            }, (err, res, body) => {
                if (!err) {
                    resolve();
                }
                else {
                    console.log("uploadFile() request error: " + e);
                }
            });
        });
    });
}

function readBarcodes(uploadedFileUrl, pages, barcodeTypes) {
    // Prepare request to `Barcode Reader` API endpoint
    let queryPath = `/barcode/read/from/url?types=${BarcodeTypes}&pages=${Pages}&url=${uploadedFileUrl}`;
    let reqOptions = {
        host: "localhost",
        path: encodeURI(queryPath),
        method: "GET"
    };
    // Send request
    https.get(reqOptions, (response) => {
        response.on("data", (d) => {
            response.setEncoding("utf8");
            // Parse JSON response
            let data = JSON.parse(d);
            if (data.error == false) {
                // Display found barcodes in console
                data.barcodes.forEach((element) => {
                    console.log("Found barcode:");
                    console.log("  Type: " + element["TypeName"]);
                    console.log("  Value: " + element["Value"]);
                    console.log("  Document Page Index: " + element["Page"]);
                    console.log("  Rectangle: " + element["Rect"]);
                    console.log("  Confidence: " + element["Confidence"]);
                    console.log();
                }, this);
            }
            else {
                // Service reported error
                console.log("readBarcodes(): " + data.message);
            }
        });
    })
    .on("error", (e) => {
        // Request error
        console.log("readBarcodes(): " + e);
    });
}

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package.json

      {
  "name": "test",
  "version": "1.0.0",
  "description": "PDF.co",
  "main": "app.js",
  "scripts": {
  },
  "keywords": [
    "pdf.co",
    "web",
    "api",
    "bytescout",
    "api"
  ],
  "author": "ByteScout & PDF.co",
  "license": "ISC",
  "dependencies": {
    "request": "^2.88.2"
  }
}