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How to implement Oauth2 authorization grant by 'Resource owner password credentials grant'?

Hello, I am on developing web applications by using noedJS/Express.

I have a problem with 'implementing resource owner password grant way' because I couldn't find any sample codes that I can refer to.

Is there any sample codes that I can refer to? I hope your helps.

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Hi @HealthcareLAB ... If you mean the Resource Owner Password Credentials Grant defined by https://datatracker.ietf.org/doc/html/rfc6749#section-4.3, this is not supported by Fitbit.   The recommended authorization flow for Fitbit is Authorization Code Grant Flow with PKCE.  We've documented how to implement it in your application at https://dev.fitbit.com/build/reference/web-api/developer-guide/authorization/.

Gordon Crenshaw
Senior Technical Solutions Consultant
Fitbit Partner Engineering & Web API Support | Google
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