# \[JwtParseError: Unexpected signature algorithm\]

**URL:** <https://devforum.okta.com/t/jwtparseerror-unexpected-signature-algorithm/4773>\
**Category:** Questions\
**Created:** [April 9, 2019, 6:32pm UTC](https://devforum.okta.com/t/jwtparseerror-unexpected-signature-algorithm/4773 "2019-04-09T18:32:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mayank0311](https://avatars.discourse-cdn.com/v4/letter/m/4da419/32.png) [@Mayank0311](https://devforum.okta.com/u/Mayank0311)\
**Post date:** [April 9, 2019, 6:32pm UTC](https://devforum.okta.com/t/jwtparseerror-unexpected-signature-algorithm/4773/1 "2019-04-09T18:32:58Z")

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Hi I have created an express application which would call my organization issuer to authenticate/SSO the user. But the API is not working at the moment and it gives me [JwtParseError: Unexpected signature algorithm] error. Can anyone help with the issue?

Thanks,  
Mayank

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**Author:** ![andrea](https://sea1.discourse-cdn.com/oktadev/user_avatar/devforum.okta.com/andrea/32/2172_2.png) [@andrea](https://devforum.okta.com/u/andrea)\
**Post date:** [January 17, 2024, 7:56pm UTC](https://devforum.okta.com/t/jwtparseerror-unexpected-signature-algorithm/4773/2 "2024-01-17T19:56:00Z")

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Closed on January 17, 2024, 7:56pm UTC