The Fabric Gateway client API is the supported API for building client applications to interact with Hyperledger Fabric version 2.4 and later. Implementations with identical capability are available in Go, Node.js (TypeScript and JavaScript), and Java.
Documentation
Usage and migration information, along with detailed API documentation is available at:
https://hyperledger.github.io/fabric-gateway/
Source code and issue tracking
Source code is maintained in the hyperledger/fabric GitHub project. The project's CONTRIBUTING guide describes where to ask questions, and how to raise issues and suggest enhancements.