import { JsonRpcController, JsonRpcMethod, IJsonRpcId, IJsonRpcParams } from 'nestjs-json-rpc' @JsonRpcController('/jsonrpc/endpoint') export class SomeJsonRpcController { @JsonRpcMethod('some-method') doSomething(@JsonRpcId() id: IJsonRpcId, @JsonRpcParams() params: IJsonRpcParams) { const {foo} = params if (foo === 'bar') { return new JsonRpcError(-100, '"foo" param should not be equal "bar"') } return 'ok' } } // App.ts @Module({ imports: [...], controllers: [SomeJsonRpcController], providers: [...], }) export class AppModule {}

import { JsonRpcMiddleware, JsonRpcMethod, IJsonRpcId, IJsonRpcParams } from 'expressjs-json-rpc' @JsonRpcMiddleware() export class SomeJsonRpcMware { @JsonRpcMethod('some-method') doSomething(@JsonRpcId() id: IJsonRpcId, @JsonRpcParams() params: IJsonRpcParams) { const {foo} = params if (foo === 'bar') { return new JsonRpcError(-100, '"foo" param should not be equal "bar"') } return 'ok' } } const jsonRpcMware = new SomeJsonRpcMware().middleware app.use('/rpc', jsonRpcMware)