JSON HTTP POST Request In Visual Basic .NET

JsonPost.vb

'Install Newtonsoft.json
'-----------------------
'
'PM> Install-Package Newtonsoft.Json -Version 6.0.8

'Sample Usage
'------------

'Dim jsonPost As New JsonPost("http://192.168.254.104:8000")
'Dim dictData As New Dictionary(Of String, Object)
'dictData.Add("test_key", "test_value")
'jsonPost.postData(dictData)

Imports Newtonsoft.Json
Imports System.Net
Imports System.Text
Public Class JsonPost

    Private urlToPost As String = ""

    Public Sub New(ByVal urlToPost As String)
        Me.urlToPost = urlToPost
    End Sub

    Public Function postData(ByVal dictData As Dictionary(Of String, Object)) As Boolean
        Dim webClient As New WebClient()
        Dim resByte As Byte()
        Dim resString As String
        Dim reqString() As Byte

        Try
            webClient.Headers("content-type") = "application/json"
            reqString = Encoding.Default.GetBytes(JsonConvert.SerializeObject(dictData, Formatting.Indented))
            resByte = webClient.UploadData(Me.urlToPost, "post", reqString)
            resString = Encoding.Default.GetString(resByte)
            Console.WriteLine(resString)
            webClient.Dispose()
            Return True
        Catch ex As Exception
            Console.WriteLine(ex.Message)
        End Try
        Return False
    End Function

End Class

Thanks so much! Keep up the good work.

Awesome! Thanks

This example return the body of the response, what can i do if i also want the head of the response?

Thank you so much!!!!!!!! Finally, all samples i found were missing something for the API i am trying, this worked beautiful

I really appreciate this. Thanks

Thank you very much! i was updating my script from python to vb and this help me very well.

Good work dude. THanks a lot

Great work, thanks a lot. Solved a problem for me immediately where I spent hours trying to do a post request with json post data and additional headers.

i encountered a problem to using button to post the json to the website. this curl post can manage to post data to the website.

curl -X POST --header 'Content-Type: application/json'
--header 'Accept: application/json'
--header 'apiKey: YOUR API KEY HERE'
-d '{
"device_developer_id": "deviceDefault@FAVORIOT",
"data": { "temperature": "31","humidity": "70"}
}'
'https://apiv2.favoriot.com/v2/streams'

However in vb.net is :

'Install Newtonsoft.json
'-----------------------
'
'PM> Install-Package Newtonsoft.Json -Version 6.0.8

'Sample Usage
'------------

'Dim jsonPost As New JsonPost("http://192.168.254.104:8000")
'Dim dictData As New Dictionary(Of String, Object)
'dictData.Add("test_key", "test_value")
'jsonPost.postData(dictData)

' favoriot part
' ============
' link : https://apiv2.favoriot.com/v2/streams

Imports Newtonsoft.Json
Imports System.Net
Imports System.Text

Public Class Form1
Private urlToPost As String = ""
Private apikey_favoriot As String = "YOUR API KEY HERE"

Public Sub New(ByVal urlToPost As String)
    Me.urlToPost = urlToPost
End Sub

Public Function postData(ByVal dictData As Dictionary(Of String, Object)) As Boolean
    Dim webClient As New WebClient()
    Dim resByte As Byte()
    Dim resString As String
    Dim reqString() As Byte

    Try
        webClient.Headers("content-type") = "application/json"
        webClient.Headers.Add("apikey", apikey_favoriot)
        reqString = Encoding.Default.GetBytes(JsonConvert.SerializeObject(dictData, Formatting.Indented))
        resByte = webClient.UploadData(Me.urlToPost, "post", reqString)
        resString = Encoding.Default.GetString(resByte)
        Console.WriteLine(resString)
        webClient.Dispose()
        Return True
    Catch ex As Exception
        Console.WriteLine(ex.Message)
    End Try
    Return False
End Function

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim Form1 As New Form1("http://192.168.254.104:8000")
    Dim dictData As New Dictionary(Of String, Object)
    dictData.Add("device_developer_id", "deviceDefault@FAVORIOT")
    dictData.Add("data", "temperature : 31")
    Form1.postData(dictData)
End Sub

End Class