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@grpc/grpc-js

gRPC Library for Node - pure JS implementation


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Weekly downloads
12M
increased by8.36%
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3
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What is @grpc/grpc-js?

The @grpc/grpc-js package is a pure JavaScript implementation of gRPC, which stands for gRPC Remote Procedure Calls. It allows you to define service methods and their input/output types using Protocol Buffers, and it handles the networking layer transparently. This package is used to build client and server applications that communicate over the gRPC protocol, which is particularly suited for microservices and other distributed systems where performance and scalability are important.

What are @grpc/grpc-js's main functionalities?

Defining a gRPC Service

This code demonstrates how to define a gRPC service using a .proto file. The service definition includes the RPC methods that can be called remotely.

const grpc = require('@grpc/grpc-js');
const protoLoader = require('@grpc/proto-loader');

const packageDefinition = protoLoader.loadSync('your_proto_file.proto', {});
const protoDescriptor = grpc.loadPackageDefinition(packageDefinition);
const yourService = protoDescriptor.your_package.YourService;

Creating a gRPC Server

This code sample shows how to create a gRPC server, add a service to it, and start listening for client requests on a specified port.

const grpc = require('@grpc/grpc-js');

const server = new grpc.Server();
server.addService(yourService.service, {
  yourMethod: (call, callback) => {
    // Implement your method logic here
    callback(null, response);
  }
});
server.bindAsync('0.0.0.0:50051', grpc.ServerCredentials.createInsecure(), () => {
  server.start();
});

Creating a gRPC Client

This code snippet illustrates how to create a gRPC client that can call methods on a gRPC server. The client uses the service definition from a .proto file to make properly structured calls.

const grpc = require('@grpc/grpc-js');
const protoLoader = require('@grpc/proto-loader');

const packageDefinition = protoLoader.loadSync('your_proto_file.proto', {});
const protoDescriptor = grpc.loadPackageDefinition(packageDefinition);
const client = new protoDescriptor.your_package.YourService('localhost:50051', grpc.credentials.createInsecure());

client.yourMethod({ yourRequestField: 'yourValue' }, (error, response) => {
  // Handle the response or error
});

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Package last updated on 09 Oct 2024

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