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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Or use a lib that you link to. I like jsoncpp. It's not tHe FaStEsT lib, but the api is clear and easy to use, and the integration has never been an issue either.
try mine https://github.com/cppfw/jsondom
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