json-rpc2-fastify

Simple json-rpc server over fastify and client over fetch for Node.js 18+

Protocol specification - https://www.jsonrpc.org/specification

Please see package usage examples in demo subdir.

Server

First import JsonRpcServer class and call the constructor with options JS object.

The options are:
* port - the TCP-port number on which the HTTP-server will run, default is 4040 (if you do not set it when initializing the server).
* entryPoint - the path where the server will listen for JSON-RPC requests via HTTP.
* logger - request logging option that is passed to fastify server.
* methods - an object whose properties define functions that can be called remotely via JSON-RPC protocol.

Code sample:

const JsonRpcServer = require('json-rpc2-fastify').JsonRpcServer;

const server = new JsonRpcServer({
logger: true,
port: 4040,
entryPoint: 'jrpc',
methods: {
ping: async function (params) {
const name = params?.name || 'Stranger';
return {
message: Pong dear ${name},
}
},
concat: async function (params) {
const terms = params?.terms || [];
const result = terms.join(' ');

return result;
}
}
});

server.start();

The ping function just return an object with message to greet ${params.name}