PDF to JSON API in VB.NET and PDF.co Web API

How to code PDF to JSON API in VB.NET: How-To tutorial

On this page you will learn from code samples for programming in VB.NET. PDF.co Web API helps with PDF to JSON API in VB.NET. PDF.co Web API is the Web API with a set of tools for documents manipulation, data conversion, data extraction, splitting and merging of documents. Includes image recognition, built-in OCR, barcode generation and barcode decoders to decode bar codes from scans, pictures and pdf.

You will save a lot of time on writing and testing code as you may just take the code below and use it in your application. VB.NET sample code is all you need: copy and paste the code to your VB.NET application’s code editor, add a reference to PDF.co Web API (if you haven’t added yet) and you are ready to go! Enjoy writing a code with ready-to-use sample VB.NET codes to add PDF to JSON API functions using PDF.co Web API in VB.NET.

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Module1.vb
      
Imports System.IO Imports System.Net Imports Newtonsoft.Json.Linq Module Module1 ' The authentication key (API Key). ' Get your own by registering at https://app.pdf.co/documentation/api Const API_KEY As String = "***********************************" ' Direct URL of source PDF file. Const SourceFileUrl As String = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-to-json/sample.pdf" ' Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'. const Pages as String = "" ' PDF document password. Leave empty for unprotected documents. const Password As string = "" ' Destination JSON file name const DestinationFile as string = ".\result.json" ' Sample profile that sets advanced conversion options ' Advanced options are properties of JSONExtractor class from ByteScout JSON Extractor SDK used in the back-end: ' https//cdn.bytescout.com/help/BytescoutPDFExtractorSDK/html/84356d44-6249-3251-2da8-83c1f34a2f39.htm ReadOnly Profiles = File.ReadAllText("profile.json") Sub Main() ' Create standard .NET web client instance Dim webClient As WebClient = New WebClient() ' Set API Key webClient.Headers.Add("x-api-key", API_KEY) ' Prepare URL for `PDF To JSON` API call Dim query As String = Uri.EscapeUriString(String.Format( "https://api.pdf.co/v1/pdf/convert/to/json?name={0}&password={1}&pages={2}&url={3}&profiles={4}", Path.GetFileName(DestinationFile), Password, Pages, SourceFileUrl, Profiles)) Try ' Execute request Dim response As String = webClient.DownloadString(query) ' Parse JSON response Dim json As JObject = JObject.Parse(response) If json("error").ToObject(Of Boolean) = False Then ' Get URL of generated JSON file Dim resultFileUrl As String = json("url").ToString() ' Download JSON file webClient.DownloadFile(resultFileUrl, DestinationFile) Console.WriteLine("Generated JSON file saved as ""{0}"" file.", DestinationFile) Else Console.WriteLine(json("message").ToString()) End If Catch ex As WebException Console.WriteLine(ex.ToString()) End Try webClient.Dispose() Console.WriteLine() Console.WriteLine("Press any key...") Console.ReadKey() End Sub End Module

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packages.config
      
<?xml version="1.0" encoding="utf-8"?> <packages> <package id="Newtonsoft.Json" version="10.0.3" targetFramework="net40" /> </packages>

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