It is a very simple protocol, defining only a few data types and commands. It allows for notifications (data sent to the server that does not require a response) and for multiple calls to be sent to the server which may be answered out of order.
JSON-RPC is a tool in the API Tools category of a tech stack.
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What are some alternatives to JSON-RPC?
gRPC is a modern open source high performance RPC framework that can run in any environment. It can efficiently connect services in and across data centers with pluggable support for load balancing, tracing, health checking...
It is a high-performance, light weight, java based RPC framework. Dubbo offers three key functionalities, which include interface based remote call, fault tolerance & load balancing, and automatic service registration & discovery.
An architectural style for developing web services. A distributed system framework that uses Web protocols and technologies.
A modular JSON-RPC library that allows pluggable transport layers, JSON libraries, and effect/async monads. It is used to communicate with embedded devices where the device is acting in the server role.
Python, MQTT, Kallithea, JSON-RPC for Java, Hyperf are some of the popular tools that integrate with JSON-RPC. Here's a list of all 5 tools that integrate with JSON-RPC.