wtf is jsonrpc?

jsonrpc is a small Go package that lets you turn ordinary Go functions into web services that other programs can call over the internet. Instead of building a full web API with routes and handlers, you register your function once and this package handles the communication layer automatically. The package uses JSON-RPC, a simple protocol where a caller sends a JSON request containing a method name, some parameters, and a request ID. The server runs the matching function and sends back a JSON response with the result. In the example provided, a Multiply function that takes two numbers gets registered, and anyone can call it by sending an HTTP request with the method name Arith.Multiply and the numbers to use. The response comes back as plain JSON with the answer. This would be useful for a Go developer who wants to expose some logic as a callable service without setting up a full REST API. For example, if you have a function that calculates shipping costs or processes a data file, you could make it available to other applications with just a few lines of code. The caller doesn't need to be written in Go, anything that can send an HTTP request with JSON will work. What's notable is how minimal the approach is. The entire package is essentially a bridge between Go's built-in RPC system and standard HTTP, using JSON as the format. There's no framework, no configuration files, and no overhead beyond what Go already provides. The README doesn't go into detail beyond the example, so it's best suited for straightforward use cases rather than complex production services that might need authentication, logging, or error handling built in.