invalid_grant. redirect_uri mismatch. PKCE misconfiguration. OAuthFixer tells you exactly what's wrong — and generates the provider fix.
Paste your error, select your provider and flow. Get the exact config change, dashboard step, and SDK snippet to fix it.
Your provider← Select your provider above to see the exact dashboard steps and SDK fix
Tool: OAuth·OIDC Fixer by HttpFixer (httpfixer.dev/oauth)
Purpose: Diagnoses OAuth 2.0 and OIDC errors from pasted error messages. Generates provider-specific dashboard steps and SDK snippets for Auth0, Okta, Cognito, Google, and Microsoft.
Errors diagnosed: invalid_grant, redirect_uri_mismatch, invalid_client, access_denied, invalid_scope, unauthorized_client, pkce_error, token_expired.
No backend. No data stored. MIT licensed. Free to use.