(VB.NET) Get Google Account Info from OAuth2 Access Token

See more Google APIs Examples

In the Google OAuth2 authorization flow, an application can know the email address of the Google account used to authorize access by requesting and processing user information from the Google UserInfo endpoint after obtaining an access token.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim http As New Chilkat.Http
Dim success As Boolean

' Implements the following CURL command:

' curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" https://www.googleapis.com/oauth2/v3/userinfo

' Use the following online tool to generate HTTP code from a CURL command
' Convert a cURL Command to HTTP Source Code

' Adds the "Authorization: Bearer YOUR_ACCESS_TOKEN" header.
http.AuthToken = "YOUR_ACCESS_TOKEN"

Dim sbResponseBody As New Chilkat.StringBuilder
success = http.QuickGetSb("https://www.googleapis.com/oauth2/v3/userinfo",sbResponseBody)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim jResp As New Chilkat.JsonObject
jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = False

Debug.WriteLine("Response Body:")
Debug.WriteLine(jResp.Emit())

Dim respStatusCode As Integer = http.LastStatus
Debug.WriteLine("Response Status Code = " & respStatusCode)
If (respStatusCode >= 400) Then
    Debug.WriteLine("Response Header:")
    Debug.WriteLine(http.LastHeader)
    Debug.WriteLine("Failed.")
    Exit Sub
End If


' Sample JSON response:
' (Sample code for parsing the JSON response is shown below)

' {
'   "sub": "112233445678901234567",
'   "name": "John Doe",
'   "given_name": "John",
'   "family_name": "Doe",
'   "profile": "https://plus.google.com/112233445678901234567",
'   "picture": "https://lh3.googleusercontent.com/a-/AOh14GiU-EXAMPLE",
'   "email": "johndoe@example.com",
'   "email_verified": true,
'   "locale": "en"
' }

' Sample code for parsing the JSON response...
' Use the following online tool to generate parsing code from sample JSON:
' Generate Parsing Code from JSON


Dim v_sub As String = jResp.StringOf("sub")
Dim name As String = jResp.StringOf("name")
Dim given_name As String = jResp.StringOf("given_name")
Dim family_name As String = jResp.StringOf("family_name")
Dim profile As String = jResp.StringOf("profile")
Dim picture As String = jResp.StringOf("picture")
Dim email As String = jResp.StringOf("email")
Dim email_verified As Boolean = jResp.BoolOf("email_verified")
Dim locale As String = jResp.StringOf("locale")