verify data in react native

I am writing an application with React Native (version 0.45.1) and I want to validate that the data sent to application is from a valid source (currently the data is static and stored in Amazon S3).

I want to :

  1. sign the data (JSON object) with an online tool (currently, no need to server side)
  2. verify in client side (react native application) that the data is valid, there is no need to encrypt the data.

That sort of question is out of scope of this community has it has nothing to do with the Auth0 service or even with authentication/authorization in general. The recommendation would be for you to post it in a more general forum like StackOverflow.