PDF.co Web API - Barcode Reader API - JavaScript - Read Barcode From Uploaded File (Node.js) - Async Api - ByteScout

PDF.co Web API – Barcode Reader API – JavaScript – Read Barcode From Uploaded File (Node.js) – Async Api

  • Home
  • /
  • Articles
  • /
  • PDF.co Web API – Barcode Reader API – JavaScript – Read Barcode From Uploaded File (Node.js) – Async Api

PDF.co Web API – Barcode Reader API – JavaScript – Read Barcode From Uploaded File (Node.js) – Async Api

ReadBarcodeFromUploadedFile.js

[javascript]
/*jshint esversion: 6 */

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”);

// The authentication key (API Key).
// Get your own by registering at https://app.pdf.co/documentation/api
const API_KEY = “***********************************”;

// Source file name
const SourceFile = “./sample.pdf”;
// Comma-separated list of barcode types to search.
// See valid barcode types in the documentation https://app.pdf.co/documentation/api/1.0/barcode/read_from_url.html
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(API_KEY, SourceFile)
.then(([uploadUrl, uploadedFileUrl]) => {
// 2. UPLOAD THE FILE TO CLOUD.
uploadFile(API_KEY, SourceFile, uploadUrl)
.then(() => {
// 3. READ BARCODES FROM UPLOADED FILE
readBarcodes(API_KEY, uploadedFileUrl, Pages, BarcodeTypes);
})
.catch(e => {
console.log(e);
});
})
.catch(e => {
console.log(e);
});

function getPresignedUrl(apiKey, localFile) {
return new Promise(resolve => {
// Prepare request to `Get Presigned URL` API endpoint
let queryPath = `/v1/file/upload/get-presigned-url?contenttype=application/octet-stream&name=${path.basename(SourceFile)}`;
let reqOptions = {
host: “api.pdf.co”,
path: encodeURI(queryPath),
headers: { “x-api-key”: API_KEY }
};
// 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(apiKey, 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(apiKey, uploadedFileUrl, pages, barcodeTypes) {
// Prepare request to `Barcode Reader` API endpoint
let queryPath = `/v1/barcode/read/from/url?types=${BarcodeTypes}&pages=${Pages}&url=${uploadedFileUrl}&async=True`;
let reqOptions = {
host: “api.pdf.co”,
path: encodeURI(queryPath),
method: “GET”,
headers: { “x-api-key”: API_KEY }
};
// 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) {
checkIfJobIsCompleted(data.jobId, data.url);
}
else {
// Service reported error
console.log(“readBarcodes(): ” + data.message);
}
});
})
.on(“error”, (e) => {
// Request error
console.log(“readBarcodes(): ” + e);
});
}

function checkIfJobIsCompleted(jobId, resultFileUrlJson) {
let queryPath = `/v1/job/check?jobid=${jobId}`;
let reqOptions = {
host: “api.pdf.co”,
path: encodeURI(queryPath),
method: “GET”,
headers: { “x-api-key”: API_KEY }
};

https.get(reqOptions, (response) => {
response.on(“data”, (d) => {
response.setEncoding(“utf8”);
// Parse JSON response
let data = JSON.parse(d);
if (data.Status == “InProgress”) {
// Check again after 2 seconds
setTimeout(function(){ checkIfJobIsCompleted(jobId, resultFileUrlJson);}, 2000);
}
else if (data.Status == “Finished”) {

request({ method: ‘GET’, uri: resultFileUrlJson, gzip: true },
function (error, response, body) {

//* workaround for issue with non supoprted firstchar code
var firstCharCode = body.charCodeAt(0);
if (firstCharCode == 65279) {
body = body.substring(1);
}

// Parse JSON response
let respJsonFileArray = JSON.parse(body);

respJsonFileArray.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 {
console.log(`Operation ended with status: “${data.Status}”.`);
}
})
});
}

[/javascript]


  Click here to get your Free Trial version of the SDK

Tutorials:

prev
next