VK Auth Callback

Handle VK OAuth callback and token exchange

Overview

This node handles the OAuth callback process for VK (VKontakte), a popular Russian social media platform. It exchanges an authorization code obtained from VK's OAuth flow for an access token and related authentication data. This is useful in scenarios where you want to authenticate users via VK and then perform actions on their behalf using VK's API.

Typical use cases include:

  • Authenticating users in your application through VK.
  • Obtaining access tokens to interact with VK APIs for user data, posting, or other integrations.
  • Automating VK login flows within n8n workflows.

Properties

Name Meaning
Authorization Code The authorization code received from VK after the user authorizes the application.
Client ID The Client ID of your VK application, used to identify your app during the OAuth flow.
Client Secret The Client Secret of your VK application, used to securely authenticate your app.
Redirect URI The callback URL registered in VK that receives the authorization code after user login.

Output

The node outputs a JSON array containing one object with the following fields:

  • success: Boolean indicating whether the token exchange was successful.
  • client_id: The provided Client ID.
  • client_secret: The provided Client Secret (note: outputting secrets may have security implications).
  • All additional fields returned by VK's /access_token endpoint, typically including:
    • access_token: The token to authorize further API requests.
    • expires_in: Token expiration time in seconds.
    • user_id: The ID of the authenticated user.
    • Possibly other VK-specific OAuth response fields.

If the request fails, the output contains:

  • success: false
  • error: The error message or response data explaining the failure.

No binary data is produced by this node.

Dependencies

  • Requires internet access to call VK's OAuth token endpoint (https://oauth.vk.com/access_token).
  • No special n8n credentials are required beyond providing the VK Client ID, Client Secret, and Redirect URI as input properties.
  • Uses the Axios HTTP client library internally to make the API request.

Troubleshooting

  • Invalid Authorization Code: If the authorization code is expired or incorrect, VK will return an error. Ensure the code is fresh and correctly passed.
  • Incorrect Client ID/Secret: Authentication will fail if these values do not match those registered in VK. Double-check your VK app settings.
  • Redirect URI Mismatch: The redirect URI must exactly match the one registered in VK; otherwise, the token exchange will be rejected.
  • Network Issues: Connectivity problems can cause request failures. Verify network access to VK endpoints.
  • Security Note: The node outputs the client secret in the result, which might expose sensitive information. Handle outputs carefully to avoid leaking secrets.

Common error messages come directly from VK's OAuth service and usually indicate issues with parameters or credentials. Review the error details in the output to diagnose.

Links and References

Discussion