does Apache Nifi support to develop APIs to expose data to 3rd Party APPs?

[#1]

I need to expose data through APIs to 3rd party Apps. Those API endpoints are needed to developed By Nifi itself. 

is that possible in Nifi?

does Nifi act as an API manager?

[#2]

@Sivaluxan NiFi exposes APIs for a lot of endpoints.  So not really sure what you are trying to accomplish in your use case.  If you want to use a third party app to access info exposed by NiF that is possible.  Or are you trying to setup some custom endpoint to expose some custom data?

Here you can find NiFi Rest-Api documentation for the latest NiFi release:
https://nifi.apache.org/docs/nifi-docs/rest-api/index.html

You can also find the NIFi rest-api documentation for your installed release directly in the application via the global menu ( 3 horizontal lines upper right corner of UI) --> help.

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Thank you,

Matt