unsupported_response_type 🔐 Authentication

OAuth 2.0 Error: unsupported_response_type

The authorize request asked for a response_type the client or server doesn’t allow — e.g. token (implicit) when only code is enabled.

Seen on: REST API

Meaning

Implicit flow (response_type=token or id_token token) is disabled by default in many providers. Libraries configured for implicit or hybrid flows fail until switched to code + PKCE or the setting is enabled.

Common causes

  • Implicit/hybrid flow disabled for the app
  • Typo or unsupported combination in response_type
  • Old library defaults to implicit flow

⚡ Quick fix

  1. Switch to response_type=code with PKCE
  2. Enable implicit/hybrid only if truly required
  3. Update the auth library

Detailed fix by platform

JavaScript

  1. javascript
    const url = authorize + "?" + new URLSearchParams({
  response_type: "code", client_id: id, redirect_uri: cb,
  code_challenge: challenge, code_challenge_method: "S256", scope: "openid profile"
});

How to diagnose

  1. Request — response_type value
  2. App — Allowed flows

🔧 Still not fixed?

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