NestJS JSON RPC package - nestjs-json-rpc npm package

Implemented JSON RPC specification

Contents

• Install
• Import module
• How to use simple handler
  • Create handler
  • Add to providers
  • Test with curl
• How to use multiple handlers in one class
  • Create handlers
  • Add to providers
  • Test with curl
• Decorators description
• Samples
• Changelog

Install

npm i --save @jashkasoft/nestjs-json-rpc

Import module

Import module RpcModule from @jashkasoft/nestjs-json-rpc, example

        JsonRpcModule.forRoot({
            path: '/rpc', // path to RPC
        })

How to use simple handler

Create simple RPC handler

Create handler

create RPC handler

import { RpcId, RpcPayload, RpcVersion, RpcMethod, IRpcHandler, RpcHandler } from '@jashkasoft/nestjs-json-rpc';

@RpcHandler({
    method: 'test',
})
export class TestHandler implements IRpcHandler<Payload> {
    public async invoke(
        @RpcPayload() payload: Payload,
        @RpcVersion() version: string,
        @RpcId() id: number | string,
        @RpcMethod() method: string
    ) {
        return payload;
    }
}

Add to providers

Add TestHandler to providers array

Test with cURL

Every request to RPC is POST method and response status = 200

Test with curl

curl -X POST "http://localhost:3000/rpc" -H "accept: application/json" -H "Content-Type: application/json" -d '{"jsonrpc": "2.0", "method": "test", "id": 2}'

How to use multiple handlers in one class

Create multiple RPC handler in one class

Create handlers

Create RPC class handler

import { RpcId, RpcPayload, RpcVersion, RpcMethod, RpcMethodHandler, RpcHandler } from '@jashkasoft/nestjs-json-rpc';

@RpcHandler({
    method: 'contact',
})
export class ContactHandler {
    @RpcMethodHandler('add')
    public async add(
        @RpcPayload() payload: Payload,
        @RpcVersion() version: string,
        @RpcId() id: number | string,
        @RpcMethod() method: string
    ) {
        return payload;
    }
    
    @RpcMethodHandler('delete')
    public async delete(
        @RpcPayload() payload: Payload,
        @RpcVersion() version: string,
        @RpcId() id: number | string,
        @RpcMethod() method: string
    ) {
        return payload;
    }
}

Add to providers

Add ContactHandler to providers array

Test with cURL

Every request to RPC is POST method and response status = 200

Test with curl contact.add

curl -X POST "http://localhost:3000/rpc" -H "accept: application/json" -H "Content-Type: application/json" -d '{"jsonrpc": "2.0", "method": "contact.add", "id": 2}'

Test with curl contact.delete

curl -X POST "http://localhost:3000/rpc" -H "accept: application/json" -H "Content-Type: application/json" -d '{"jsonrpc": "2.0", "method": "contact.delete", "id": 2}'

Decorators description

field	decorator	description	required	other
params	@RpcPayload()	get payload ( params )	false	use pipes...
jsonrpc	@RpcVersion()	get rpc version	true	use pipes...
method	@RpcMethod()	get rpc version	true	use pipes...
id	@RpcId()	get client operation id	false	if not send - response not send, RPC notification. use pipes...

Samples

See examples in samples folder

Changelog:

7.6.0

• NestJS 7.3.* ( breaking change )
• typescript 3.9.7 ( breaking change )
• use DiscoveryModule

7.5.0

• add multiple RPC handlers for class
• NestJS 7.2.*

7.4.0

• fix types for JsonRpcModule async options
• export JSON_RPC_OPTIONS.
  You can inject rpc config:
  @Inject(JSON_RPC_OPTIONS) private config: JsonRpcConfig

7.3.2

• decrease bundle size

7.3.0

• allow response object
• add custom headers

7.2.0

• add injection scopes ( REQUEST / TRANSIENT ) to JSON RPC handlers
• add logging register handlers
• add injection scopes sample

7.1.1

• add express engine example

7.1.0

• add support fastify adapter

7.0.0

• support nestjs 7.0.0
• fix types
• add to decorators ExecutionContext ( breaking change )