How to make successful connection OAUTH2.0 with grant type client credentials in postman
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‎03-03-2025 08:32 PM
I am trying to get access token in postman with OATUH2.0 with grant type client credentials, but it fails. I have given correct client id and password.
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‎03-03-2025 08:46 PM
check my blog
If my response helped please mark it correct and close the thread so that it benefits future readers.
Ankur
✨ Certified Technical Architect || ✨ 9x ServiceNow MVP || ✨ ServiceNow Community Leader
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‎03-03-2025 08:47 PM
Common Issues and Troubleshooting:
Invalid Token URL: Double-check that the token URL you’re using is correct. It should be provided by the API you are trying to access.
Incorrect Client ID or Secret: Ensure that both the Client ID and Client Secret are correct. Even small typos can cause authentication failure.
Scope Missing: Some APIs might require a scope, so if it's required, ensure you have added it correctly.
Authorization Server Configuration: Sometimes, the issue may lie with the authorization server itself. Ensure the OAuth 2.0 server is correctly configured to support client credentials.
Response Body/Error Message: Look at the response body for any error messages. For example, the response might contain:
- invalid_client (if client ID or secret is wrong),
- invalid_grant (if the grant type or credentials are incorrect),
- invalid_scope (if a required scope is missing).
Content-Type Header: In some cases, you may need to manually set the Content-Type header in the Headers tab to application/x-www-form-urlencoded.
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‎03-03-2025 11:12 PM
Hi @vijayakumar kon ,
I can recommend below articles, as this led me to set it up yesterday for the first time myself:
https://sapphirenow.dev/post/wdc-oauth-part-1/
https://sapphirenow.dev/post/oauth-part-2/
If my answer has helped with your question, please mark my answer as the accepted solution and give a thumbs up.
Best regards
Anders
Rising star 2024
MVP 2025
linkedIn: https://www.linkedin.com/in/andersskovbjerg/