How to convert PDF to JSON from uploaded file for PDF to JSON API in VB.NET and PDF.co Web API

Tutorial: how to convert PDF to JSON from uploaded file for PDF to JSON API in VB.NET

The sample source codes on this page will demonstrate you how to make PDF to JSON API in VB.NET. PDF.co Web API was made to help with PDF to JSON API in VB.NET. PDF.co Web API is the Rest API that provides set of data extraction functions, tools for documents manipulation, splitting and merging of pdf files. Includes built-in OCR, images recognition, can generate and read barcodes from images, scans 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. For implimentation of this functionality, please copy and paste code below into your app using code editor. Then compile and run your app. Tutorials are available along with installed PDF.co Web API if you’d like to dive deeper into the topic and the details of the API.

Trial version of ByteScout is available for free download from our website. This and other source code samples for VB.NET and other programming languages are available.

Try PDF.co Web API today:  60 Day Free Trial (on-premise) or  Web API (on-demand version)

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 = "***********************************" ' Source PDF file const SourceFile as String = ".\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" 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) ' 1. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE. ' * If you already have a direct file URL, skip to the step 3. ' Prepare URL for `Get Presigned URL` API call Dim query As string = Uri.EscapeUriString(string.Format( "https://api.pdf.co/v1/file/upload/get-presigned-url?contenttype=application/octet-stream&name={0}", Path.GetFileName(SourceFile))) 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 to use for the file upload Dim uploadUrl As string = json("presignedUrl").ToString() ' Get URL of uploaded file to use with later API calls Dim uploadedFileUrl As string = json("url").ToString() ' 2. UPLOAD THE FILE TO CLOUD. webClient.Headers.Add("content-type", "application/octet-stream") webClient.UploadFile(uploadUrl, "PUT", SourceFile) ' You can use UploadData() instead if your file is byte array or Stream ' 3. CONVERT UPLOADED PDF FILE TO JSON ' Prepare URL for `PDF To JSON` API call query = Uri.EscapeUriString(String.Format( "https://api.pdf.co/v1/pdf/convert/to/json?name={0}&password={1}&pages={2}&url={3}", Path.GetFileName(DestinationFile), Password, Pages, uploadedFileUrl)) ' Execute request response = webClient.DownloadString(query) ' Parse JSON response json = 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 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

Try PDF.co Web API today:  60 Day Free Trial (on-premise) or  Web API (on-demand version)

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

Try PDF.co Web API today:  60 Day Free Trial (on-premise) or  Web API (on-demand version)

VIDEO

ON-PREMISE VERSION INFORMATION

Get 60 Day Free Trial or Visit PDF.co Web API Home Page

Explore PDF.co Web API Documentation

Get PDF.co Web API Free Training

WEB API

Get Your Free API Key

Explore Web API Documentation

Related Samples: