How can I solve the issue of “error=redirect_uri_mismatch&error_description=redirect_uri must match configuration”?

 In the context of Salesforce, if you are getting the issue message of “ error=redirect_uri_mismatch&error_description=redirect_uri must match configuration” then you should follow the several steps which are given below for troubleshooting this particular issue:-

Checking OAuth Client Configuration

Try to verify that the redirect URI configured in the OAuth client matches the redirect URI that was used in the authentication request.

Encoding URI components

Try to ensure that the redirect URI is properly encoded considering characters such as spaces, URL, or not.

Whitelist Redirect URIs

Try to confirm that the OAuth Provider is allowing the particular redirect URI as some providers can enforce strict UPI matching, including the protocol and trailing slashes.

Dynamic Redirect URIs

If you are using dynamic Redirect URIs then try to ensure that the OAuth provider supports this particular feature. Keep in mind that the dynamically generated redirect URI should match the configured pattern.

Debugging tools

You can use the OAuth debugging tools or even logs which are provided by the OAuth provider for inspecting the actual request and response parameters.

In terms of coding the URL encoding and OAuth client Configuration possibly could look like this:-

// Example JavaScript code for URL encoding redirect URI

Const encodedRedirectUri = encodeURIComponent(‘https://yourapp.com/callback’);

// Example OAuth client configuration (e.g., in a configuration file)

Const oauthConfig = {

  clientId: ‘yourClientId’,

  clientSecret: ‘yourClientSecret’,

  redirectUri: ‘https://yourapp.com/callback’,

  // … other configuration options

};

Therefore, by carefully reviewing and aligning the redirect URI in the OAuth client configuration you as a developer can easily address the issue of “error=redirect_uri_mismatch&error_description=redirect_uri must match configuration”.