Google Cloud Pub/Sub: Node.js Client

Cloud Pub/Sub is a fully-managed real-time messaging service that allows you to send and receive messages between independent applications.

This document contains links to an API reference, samples, and other resources useful to developing Node.js applications. For additional help developing Pub/Sub applications, in Node.js and other languages, see our Pub/Sub quickstart, publisher, and subscriber guides.

Read more about the client libraries for Cloud APIs, including the older Google APIs Client Libraries, in Client Libraries Explained.

Table of contents:

Quickstart
Samples
Versioning
Contributing
License

Quickstart

Before you begin

Select or create a Cloud Platform project.
Enable billing for your project.
Enable the Google Cloud Pub/Sub API.
Set up authentication with a service account so you can access the API from your local workstation.

Installing the client library

npm install @google-cloud/pubsub

Using the client library

// Imports the Google Cloud client library
const {PubSub} = require('@google-cloud/pubsub');

async function quickstart(
  projectId = 'your-project-id', // Your Google Cloud Platform project ID
  topicName = 'my-topic' // Name for the new topic to create
) {
  // Instantiates a client
  const pubsub = new PubSub({projectId});

  // Creates the new topic
  const [topic] = await pubsub.createTopic(topicName);
  console.log(`Topic ${topic.name} created.`);
}

Running gRPC C++ bindings

For some workflows and environments it might make sense to use the C++ gRPC implementation, instead of the default one (see: #770):

To configure @google-cloud/pubsub to use an alternative grpc transport:

npm install grpc, adding grpc as a dependency.

instantiate @google-cloud/pubsub with grpc:

const {PubSub} = require('@google-cloud/pubsub');
const grpc = require('grpc');
const pubsub = new PubSub({grpc});

Samples

Samples are in the samples/ directory. The samples' README.md has instructions for running the samples.

Sample	Source Code	Try it
Create Push Subscription	source code
Create Subscription	source code
Create Topic	source code
Delete Subscription	source code
Delete Topic	source code
Get Subscription	source code
Get Subscription Policy	source code
Get Topic Policy	source code
List All Topics	source code
List Subscriptions	source code
List Subscriptions On a Topic	source code
Listen For Errors	source code
Listen For Messages	source code
Listen For Ordered Messages	source code
Modify Push Configuration	source code
Publish Batched Messages	source code
Publish Message	source code
Publish Message With Custom Attributes	source code
Publish Ordered Message	source code
Publish With Retry Settings	source code
Quickstart	source code
Set Subscription IAM Policy	source code
Set Topic IAM Policy	source code
Subscribe With Flow Control Settings	source code
Synchronous Pull	source code
Synchronous Pull With Lease Management	source code
Test Subscription Permissions	source code
Test Topic Permissions	source code

The Google Cloud Pub/Sub Node.js Client API Reference documentation also contains samples.

Versioning

This library follows Semantic Versioning.

This library is considered to be General Availability (GA). This means it is stable; the code surface will not change in backwards-incompatible ways unless absolutely necessary (e.g. because of critical security issues) or with an extensive deprecation period. Issues and requests against GA libraries are addressed with the highest priority.

More Information: Google Cloud Platform Launch Stages

Contributing

Contributions welcome! See the Contributing Guide.

License

Apache Version 2.0

See LICENSE

torgeiou/nodejs-pubsub