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[//]: # "This README.md file is auto-generated, all changes to this file will be lost."
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[//]: # "To regenerate it, use `python -m synthtool`."
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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"/>
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# [GCP Metadata: Node.js Client](https://github.com/googleapis/gcp-metadata)
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[](https://cloud.google.com/terms/launch-stages)
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[](https://www.npmjs.org/package/gcp-metadata)
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Get the metadata from a Google Cloud Platform environment
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A comprehensive list of changes in each version may be found in
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[the CHANGELOG](https://github.com/googleapis/gcp-metadata/blob/main/CHANGELOG.md).
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* [GCP Metadata Node.js Client API Reference][client-docs]
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* [GCP Metadata Documentation][product-docs]
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* [github.com/googleapis/gcp-metadata](https://github.com/googleapis/gcp-metadata)
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Read more about the client libraries for Cloud APIs, including the older
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Google APIs Client Libraries, in [Client Libraries Explained][explained].
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[explained]: https://cloud.google.com/apis/docs/client-libraries-explained
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**Table of contents:**
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* [Quickstart](#quickstart)
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* [Installing the client library](#installing-the-client-library)
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* [Using the client library](#using-the-client-library)
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* [Samples](#samples)
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* [Versioning](#versioning)
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* [Contributing](#contributing)
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* [License](#license)
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## Quickstart
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### Installing the client library
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```bash
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npm install gcp-metadata
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```
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### Using the client library
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```javascript
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const gcpMetadata = require('gcp-metadata');
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async function quickstart() {
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// check to see if this code can access a metadata server
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const isAvailable = await gcpMetadata.isAvailable();
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console.log(`Is available: ${isAvailable}`);
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// Instance and Project level metadata will only be available if
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// running inside of a Google Cloud compute environment such as
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// Cloud Functions, App Engine, Kubernetes Engine, or Compute Engine.
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// To learn more about the differences between instance and project
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// level metadata, see:
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// https://cloud.google.com/compute/docs/storing-retrieving-metadata#project-instance-metadata
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if (isAvailable) {
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// grab all top level metadata from the service
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const instanceMetadata = await gcpMetadata.instance();
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console.log('Instance metadata:');
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console.log(instanceMetadata);
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// get all project level metadata
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const projectMetadata = await gcpMetadata.project();
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console.log('Project metadata:');
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console.log(projectMetadata);
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}
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}
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quickstart();
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```
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#### Check to see if the metadata server is available
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```js
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const isAvailable = await gcpMetadata.isAvailable();
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```
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#### Access all metadata
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```js
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const data = await gcpMetadata.instance();
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console.log(data); // ... All metadata properties
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```
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#### Access specific properties
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```js
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const data = await gcpMetadata.instance('hostname');
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console.log(data); // ...Instance hostname
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const projectId = await gcpMetadata.project('project-id');
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console.log(projectId); // ...Project ID of the running instance
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```
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#### Access nested properties with the relative path
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```js
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const data = await gcpMetadata.instance('service-accounts/default/email');
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console.log(data); // ...Email address of the Compute identity service account
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```
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#### Access specific properties with query parameters
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```js
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const data = await gcpMetadata.instance({
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property: 'tags',
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params: { alt: 'text' }
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});
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console.log(data) // ...Tags as newline-delimited list
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```
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#### Access with custom headers
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```js
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await gcpMetadata.instance({
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headers: { 'no-trace': '1' }
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}); // ...Request is untraced
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```
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### Take care with large number valued properties
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In some cases number valued properties returned by the Metadata Service may be
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too large to be representable as JavaScript numbers. In such cases we return
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those values as `BigNumber` objects (from the [bignumber.js](https://github.com/MikeMcl/bignumber.js) library). Numbers
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that fit within the JavaScript number range will be returned as normal number
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values.
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```js
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const id = await gcpMetadata.instance('id');
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console.log(id) // ... BigNumber { s: 1, e: 18, c: [ 45200, 31799277581759 ] }
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console.log(id.toString()) // ... 4520031799277581759
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```
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### Environment variables
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* `GCE_METADATA_HOST`: provide an alternate host or IP to perform lookup against (useful, for example, you're connecting through a custom proxy server).
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For example:
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```
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export GCE_METADATA_HOST='169.254.169.254'
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```
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* `DETECT_GCP_RETRIES`: number representing number of retries that should be attempted on metadata lookup.
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* `DEBUG_AUTH`: emit debugging logs
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* `METADATA_SERVER_DETECTION`: configure desired metadata server availability check behavior.
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* `assume-present`: don't try to ping the metadata server, but assume it's present
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* `none`: don't try to ping the metadata server, but don't try to use it either
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* `bios-only`: treat the result of a BIOS probe as canonical (don't fall back to pinging)
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* `ping-only`: skip the BIOS probe, and go straight to pinging
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## Samples
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Samples are in the [`samples/`](https://github.com/googleapis/gcp-metadata/tree/main/samples) directory. Each sample's `README.md` has instructions for running its sample.
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| Sample | Source Code | Try it |
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| --------------------------- | --------------------------------- | ------ |
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| Quickstart | [source code](https://github.com/googleapis/gcp-metadata/blob/main/samples/quickstart.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/gcp-metadata&page=editor&open_in_editor=samples/quickstart.js,samples/README.md) |
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The [GCP Metadata Node.js Client API Reference][client-docs] documentation
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also contains samples.
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## Supported Node.js Versions
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Our client libraries follow the [Node.js release schedule](https://github.com/nodejs/release#release-schedule).
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Libraries are compatible with all current _active_ and _maintenance_ versions of
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Node.js.
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If you are using an end-of-life version of Node.js, we recommend that you update
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as soon as possible to an actively supported LTS version.
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Google's client libraries support legacy versions of Node.js runtimes on a
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best-efforts basis with the following warnings:
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* Legacy versions are not tested in continuous integration.
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* Some security patches and features cannot be backported.
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* Dependencies cannot be kept up-to-date.
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Client libraries targeting some end-of-life versions of Node.js are available, and
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can be installed through npm [dist-tags](https://docs.npmjs.com/cli/dist-tag).
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The dist-tags follow the naming convention `legacy-(version)`.
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For example, `npm install gcp-metadata@legacy-8` installs client libraries
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for versions compatible with Node.js 8.
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## Versioning
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This library follows [Semantic Versioning](http://semver.org/).
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This library is considered to be **stable**. The code surface will not change in backwards-incompatible ways
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unless absolutely necessary (e.g. because of critical security issues) or with
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an extensive deprecation period. Issues and requests against **stable** libraries
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are addressed with the highest priority.
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More Information: [Google Cloud Platform Launch Stages][launch_stages]
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[launch_stages]: https://cloud.google.com/terms/launch-stages
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## Contributing
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Contributions welcome! See the [Contributing Guide](https://github.com/googleapis/gcp-metadata/blob/main/CONTRIBUTING.md).
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Please note that this `README.md`, the `samples/README.md`,
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and a variety of configuration files in this repository (including `.nycrc` and `tsconfig.json`)
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are generated from a central template. To edit one of these files, make an edit
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to its templates in
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[directory](https://github.com/googleapis/synthtool).
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## License
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Apache Version 2.0
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See [LICENSE](https://github.com/googleapis/gcp-metadata/blob/main/LICENSE)
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[client-docs]: https://cloud.google.com/nodejs/docs/reference/gcp-metadata/latest
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[product-docs]: https://cloud.google.com/compute/docs/storing-retrieving-metadata
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[shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
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[projects]: https://console.cloud.google.com/project
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[billing]: https://support.google.com/cloud/answer/6293499#enable-billing
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[auth]: https://cloud.google.com/docs/authentication/external/set-up-adc-local
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