We are developing an API project that takes JWS objects as parameters. Of course we control server / client keys, so the keys are known. However, it is laborious to construct those JWS strings by hand for every variation of JSON payload.

Could anyone please suggest some online web-based JWS builder / generator / constructor tool for building JSON Web Signature JWS strings out of given JSON Payload object and Keys? Thank You!

Input:

• RSA Private Key or ECDSA Private Key
• JSON Payload string

Output:

• JWS string in a "Compact" serialized format

Kind of similar to this one, but I need to be able to provide my own JSON PAYLOAD strings, and not be limited to just JWT claim attributes like in that tool. Thanks!