@zaplify/gcp-pubsub
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Cloud Pub/Sub Client Library for Node.js
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<img src="https://avatars2.githubusercontent.com/u/2810941?v=3&s=96" alt="Google Cloud Platform logo" title="Google Cloud Platform" align="right" height="96" width="96"/>
# [Google Cloud Pub/Sub: Node.js Client](https://github.com/googleapis/nodejs-pubsub)
[](https://cloud.google.com/terms/launch-stages)
[](https://www.npmjs.org/package/@google-cloud/pubsub)
[Cloud Pub/Sub](https://cloud.google.com/pubsub/docs) 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](https://cloud.google.com/nodejs/docs/reference/pubsub/latest/overview), 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](https://cloud.google.com/pubsub/docs/quickstart-client-libraries),
[publisher](https://cloud.google.com/pubsub/docs/publisher), and [subscriber](https://cloud.google.com/pubsub/docs/subscriber)
guides.
A comprehensive list of changes in each version may be found in
[the CHANGELOG](https://github.com/googleapis/nodejs-pubsub/blob/main/CHANGELOG.md).
* [Google Cloud Pub/Sub Node.js Client API Reference][client-docs]
* [Google Cloud Pub/Sub Documentation][product-docs]
* [github.com/googleapis/nodejs-pubsub](https://github.com/googleapis/nodejs-pubsub)
Read more about the client libraries for Cloud APIs, including the older
Google APIs Client Libraries, in [Client Libraries Explained][explained].
[explained]: https://cloud.google.com/apis/docs/client-libraries-explained
**Table of contents:**
* [Quickstart](#quickstart)
* [Before you begin](#before-you-begin)
* [Installing the client library](#installing-the-client-library)
* [Using the client library](#using-the-client-library)
* [Samples](#samples)
* [Versioning](#versioning)
* [Contributing](#contributing)
* [License](#license)
## Quickstart
### Before you begin
1. [Select or create a Cloud Platform project][projects].
1. [Enable billing for your project][billing].
1. [Enable the Google Cloud Pub/Sub API][enable_api].
1. [Set up authentication with a service account][auth] so you can access the
API from your local workstation.
### Installing the client library
```bash
npm install @google-cloud/pubsub
```
### Using the client library
```javascript
// 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
topicNameOrId = 'my-topic', // Name for the new topic to create
subscriptionName = 'my-sub' // Name for the new subscription to create
) {
// Instantiates a client
const pubsub = new PubSub({projectId});
// Creates a new topic
const [topic] = await pubsub.createTopic(topicNameOrId);
console.log(`Topic ${topic.name} created.`);
// Creates a subscription on that new topic
const [subscription] = await topic.createSubscription(subscriptionName);
// Receive callbacks for new messages on the subscription
subscription.on('message', message => {
console.log('Received message:', message.data.toString());
process.exit(0);
});
// Receive callbacks for errors on the subscription
subscription.on('error', error => {
console.error('Received error:', error);
process.exit(1);
});
// Send a message to the topic
topic.publishMessage({data: Buffer.from('Test message!')});
}
```
## 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](https://github.com/googleapis/nodejs-pubsub/issues/770)):
To configure `@google-cloud/pubsub` to use an alternative `grpc` transport:
1. `npm install grpc`, adding `grpc` as a dependency.
1. instantiate `@google-cloud/pubsub` with `grpc`:
```js
const {PubSub} = require('@google-cloud/pubsub');
const grpc = require('grpc');
const pubsub = new PubSub({grpc});
```
## Samples
Samples are in the [`samples/`](https://github.com/googleapis/nodejs-pubsub/tree/main/samples) directory. Each sample's `README.md` has instructions for running its sample.
| Sample | Source Code | Try it |
| --------------------------- | --------------------------------- | ------ |
| Create an Avro based Schema | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createAvroSchema.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createAvroSchema.js,samples/README.md) |
| Create BigQuery Subscription | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createBigQuerySubscription.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createBigQuerySubscription.js,samples/README.md) |
| Create a Proto based Schema | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createProtoSchema.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createProtoSchema.js,samples/README.md) |
| Create Push Subscription | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createPushSubscription.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createPushSubscription.js,samples/README.md) |
| Create Subscription | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createSubscription.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createSubscription.js,samples/README.md) |
| Create Subscription With Dead Letter Policy | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createSubscriptionWithDeadLetterPolicy.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createSubscriptionWithDeadLetterPolicy.js,samples/README.md) |
| Create an exactly-once delivery subscription | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createSubscriptionWithExactlyOnceDelivery.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createSubscriptionWithExactlyOnceDelivery.js,samples/README.md) |
| Create Subscription With Filtering | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createSubscriptionWithFiltering.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createSubscriptionWithFiltering.js,samples/README.md) |
| Create Subscription with ordering enabled | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createSubscriptionWithOrdering.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createSubscriptionWithOrdering.js,samples/README.md) |
| Create Subscription With Retry Policy | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createSubscriptionWithRetryPolicy.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createSubscriptionWithRetryPolicy.js,samples/README.md) |
| Create Topic | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createTopic.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createTopic.js,samples/README.md) |
| Create Topic With Schema | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/createTopicWithSchema.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/createTopicWithSchema.js,samples/README.md) |
| Delete a previously created schema | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/deleteSchema.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/deleteSchema.js,samples/README.md) |
| Delete Subscription | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/deleteSubscription.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/deleteSubscription.js,samples/README.md) |
| Delete Topic | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/deleteTopic.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/deleteTopic.js,samples/README.md) |
| Detach Subscription | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/detachSubscription.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/detachSubscription.js,samples/README.md) |
| Get a previously created schema | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/getSchema.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/getSchema.js,samples/README.md) |
| Get Subscription | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/getSubscription.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/getSubscription.js,samples/README.md) |
| Get Subscription Policy | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/getSubscriptionPolicy.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/getSubscriptionPolicy.js,samples/README.md) |
| Get Topic Policy | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/getTopicPolicy.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/getTopicPolicy.js,samples/README.md) |
| List All Topics | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listAllTopics.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listAllTopics.js,samples/README.md) |
| List schemas on a project | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listSchemas.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listSchemas.js,samples/README.md) |
| List Subscriptions | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listSubscriptions.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listSubscriptions.js,samples/README.md) |
| List Subscriptions On a Topic | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listTopicSubscriptions.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listTopicSubscriptions.js,samples/README.md) |
| Listen For Avro Records | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listenForAvroRecords.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listenForAvroRecords.js,samples/README.md) |
| Listen For Errors | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listenForErrors.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listenForErrors.js,samples/README.md) |
| Listen For Messages | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listenForMessages.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listenForMessages.js,samples/README.md) |
| Listen with exactly-once delivery | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listenForMessagesWithExactlyOnceDelivery.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listenForMessagesWithExactlyOnceDelivery.js,samples/README.md) |
| Listen For Protobuf Messages | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listenForProtobufMessages.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listenForProtobufMessages.js,samples/README.md) |
| Listen For Messages With Custom Attributes | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/listenWithCustomAttributes.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/listenWithCustomAttributes.js,samples/README.md) |
| Modify Push Configuration | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/modifyPushConfig.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/modifyPushConfig.js,samples/README.md) |
| OpenTelemetry Tracing | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/openTelemetryTracing.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/openTelemetryTracing.js,samples/README.md) |
| Publish Avro Records to a Topic | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/publishAvroRecords.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishAvroRecords.js,samples/README.md) |
| Publish Batched Messages | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/publishBatchedMessages.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishBatchedMessages.js,samples/README.md) |
| Publish Message | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/publishMessage.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishMessage.js,samples/README.md) |
| Publish Message With Custom Attributes | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/publishMessageWithCustomAttributes.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishMessageWithCustomAttributes.js,samples/README.md) |
| Publish Ordered Message | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/publishOrderedMessage.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishOrderedMessage.js,samples/README.md) |
| Publish Protobuf Messages to a Topic | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/publishProtobufMessages.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishProtobufMessages.js,samples/README.md) |
| Publish with flow control | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/publishWithFlowControl.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishWithFlowControl.js,samples/README.md) |
| Publish With Retry Settings | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/publishWithRetrySettings.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/publishWithRetrySettings.js,samples/README.md) |
| Quickstart | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/quickstart.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/quickstart.js,samples/README.md) |
| Remove Dead Letter Policy | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/removeDeadLetterPolicy.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/removeDeadLetterPolicy.js,samples/README.md) |
| Resume Publish | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/resumePublish.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/resumePublish.js,samples/README.md) |
| Set Subscription IAM Policy | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/setSubscriptionPolicy.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/setSubscriptionPolicy.js,samples/README.md) |
| Set Topic IAM Policy | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/setTopicPolicy.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/setTopicPolicy.js,samples/README.md) |
| Subscribe With Flow Control Settings | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/subscribeWithFlowControlSettings.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/subscribeWithFlowControlSettings.js,samples/README.md) |
| Synchronous Pull | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/synchronousPull.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/synchronousPull.js,samples/README.md) |
| Synchronous Pull with delivery attempt. | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/synchronousPullWithDeliveryAttempts.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/synchronousPullWithDeliveryAttempts.js,samples/README.md) |
| Synchronous Pull With Lease Management | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/synchronousPullWithLeaseManagement.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/synchronousPullWithLeaseManagement.js,samples/README.md) |
| Test Subscription Permissions | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/testSubscriptionPermissions.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/testSubscriptionPermissions.js,samples/README.md) |
| Test Topic Permissions | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/testTopicPermissions.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/testTopicPermissions.js,samples/README.md) |
| Update Dead Letter Policy | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/updateDeadLetterPolicy.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/updateDeadLetterPolicy.js,samples/README.md) |
| Validate a schema definition | [source code](https://github.com/googleapis/nodejs-pubsub/blob/main/samples/validateSchema.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-pubsub&page=editor&open_in_editor=samples/validateSchema.js,samples/README.md) |
The [Google Cloud Pub/Sub Node.js Client API Reference][client-docs] documentation
also contains samples.
## Supported Node.js Versions
Our client libraries follow the [Node.js release schedule](https://github.com/nodejs/release#release-schedule).
Libraries are compatible with all current _active_ and _maintenance_ versions of
Node.js.
If you are using an end-of-life version of Node.js, we recommend that you update
as soon as possible to an actively supported LTS version.
Google's client libraries support legacy versions of Node.js runtimes on a
best-efforts basis with the following warnings:
* Legacy versions are not tested in continuous integration.
* Some security patches and features cannot be backported.
* Dependencies cannot be kept up-to-date.
Client libraries targeting some end-of-life versions of Node.js are available, and
can be installed through npm [dist-tags](https://docs.npmjs.com/cli/dist-tag).
The dist-tags follow the naming convention `legacy-(version)`.
For example, `npm install @google-cloud/pubsub@legacy-8` installs client libraries
for versions compatible with Node.js 8.
## Versioning
This library follows [Semantic Versioning](http://semver.org/).
This library is considered to be **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 **stable** libraries
are addressed with the highest priority.
More Information: [Google Cloud Platform Launch Stages][launch_stages]
[launch_stages]: https://cloud.google.com/terms/launch-stages
## Contributing
Contributions welcome! See the [Contributing Guide](https://github.com/googleapis/nodejs-pubsub/blob/main/CONTRIBUTING.md).
Please note that this `README.md`, the `samples/README.md`,
and a variety of configuration files in this repository (including `.nycrc` and `tsconfig.json`)
are generated from a central template. To edit one of these files, make an edit
to its templates in
[directory](https://github.com/googleapis/synthtool).
## License
Apache Version 2.0
See [LICENSE](https://github.com/googleapis/nodejs-pubsub/blob/main/LICENSE)
[client-docs]: https://cloud.google.com/nodejs/docs/reference/pubsub/latest
[product-docs]: https://cloud.google.com/pubsub/docs/
[shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
[projects]: https://console.cloud.google.com/project
[billing]: https://support.google.com/cloud/answer/6293499#enable-billing
[enable_api]: https://console.cloud.google.com/flows/enableapi?apiid=pubsub.googleapis.com
[auth]: https://cloud.google.com/docs/authentication/getting-started