Security Token Service (STS) enables you to request temporary, limited-privilege\ncredentials for users. This guide provides descriptions of the STS API. For\nmore information about using this service, see Temporary Security Credentials.
\n\n## Installing\nTo install this package, simply type add or install @aws-sdk/client-sts\nusing your favorite package manager:\n- `npm install @aws-sdk/client-sts`\n- `yarn add @aws-sdk/client-sts`\n- `pnpm add @aws-sdk/client-sts`\n\n## Getting Started\n\n### Import\n\nThe AWS SDK is modulized by clients and commands.\nTo send a request, you only need to import the `STSClient` and\nthe commands you need, for example `GetCallerIdentityCommand`:\n\n```js\n// ES5 example\nconst { STSClient, GetCallerIdentityCommand } = require(\"@aws-sdk/client-sts\");\n```\n\n```ts\n// ES6+ example\nimport { STSClient, GetCallerIdentityCommand } from \"@aws-sdk/client-sts\";\n```\n\n### Usage\n\nTo send a request, you:\n\n- Initiate client with configuration (e.g. credentials, region).\n- Initiate command with input parameters.\n- Call `send` operation on client with command object as input.\n- If you are using a custom http handler, you may call `destroy()` to close open connections.\n\n```js\n// a client can be shared by different commands.\nconst client = new STSClient({ region: \"REGION\" });\n\nconst params = { /** input parameters */ };\nconst command = new GetCallerIdentityCommand(params);\n```\n\n#### Async/await\n\nWe recommend using [await](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await)\noperator to wait for the promise returned by send operation as follows:\n\n```js\n// async/await.\ntry {\n const data = await client.send(command);\n // process data.\n} catch (error) {\n // error handling.\n} finally {\n // finally.\n}\n```\n\nAsync-await is clean, concise, intuitive, easy to debug and has better error handling\nas compared to using Promise chains or callbacks.\n\n#### Promises\n\nYou can also use [Promise chaining](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises#chaining)\nto execute send operation.\n\n```js\nclient.send(command).then(\n (data) => {\n // process data.\n },\n (error) => {\n // error handling.\n }\n);\n```\n\nPromises can also be called using `.catch()` and `.finally()` as follows:\n\n```js\nclient\n .send(command)\n .then((data) => {\n // process data.\n })\n .catch((error) => {\n // error handling.\n })\n .finally(() => {\n // finally.\n });\n```\n\n#### Callbacks\n\nWe do not recommend using callbacks because of [callback hell](http://callbackhell.com/),\nbut they are supported by the send operation.\n\n```js\n// callbacks.\nclient.send(command, (err, data) => {\n // process err and data.\n});\n```\n\n#### v2 compatible style\n\nThe client can also send requests using v2 compatible style.\nHowever, it results in a bigger bundle size and may be dropped in next major version. More details in the blog post\non [modular packages in AWS SDK for JavaScript](https://aws.amazon.com/blogs/developer/modular-packages-in-aws-sdk-for-javascript/)\n\n```ts\nimport * as AWS from \"@aws-sdk/client-sts\";\nconst client = new AWS.STS({ region: \"REGION\" });\n\n// async/await.\ntry {\n const data = await client.getCallerIdentity(params);\n // process data.\n} catch (error) {\n // error handling.\n}\n\n// Promises.\nclient\n .getCallerIdentity(params)\n .then((data) => {\n // process data.\n })\n .catch((error) => {\n // error handling.\n });\n\n// callbacks.\nclient.getCallerIdentity(params, (err, data) => {\n // process err and data.\n});\n```\n\n### Troubleshooting\n\nWhen the service returns an exception, the error will include the exception information,\nas well as response metadata (e.g. request id).\n\n```js\ntry {\n const data = await client.send(command);\n // process data.\n} catch (error) {\n const { requestId, cfId, extendedRequestId } = error.$metadata;\n console.log({ requestId, cfId, extendedRequestId });\n /**\n * The keys within exceptions are also parsed.\n * You can access them by specifying exception names:\n * if (error.name === 'SomeServiceException') {\n * const value = error.specialKeyInException;\n * }\n */\n}\n```\n\n## Getting Help\n\nPlease use these community resources for getting help.\nWe use the GitHub issues for tracking bugs and feature requests, but have limited bandwidth to address them.\n\n- Visit [Developer Guide](https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/welcome.html)\n or [API Reference](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/index.html).\n- Check out the blog posts tagged with [`aws-sdk-js`](https://aws.amazon.com/blogs/developer/tag/aws-sdk-js/)\n on AWS Developer Blog.\n- Ask a question on [StackOverflow](https://stackoverflow.com/questions/tagged/aws-sdk-js) and tag it with `aws-sdk-js`.\n- Join the AWS JavaScript community on [gitter](https://gitter.im/aws/aws-sdk-js-v3).\n- If it turns out that you may have found a bug, please [open an issue](https://github.com/aws/aws-sdk-js-v3/issues/new/choose).\n\nTo test your universal JavaScript code in Node.js, browser and react-native environments,\nvisit our [code samples repo](https://github.com/aws-samples/aws-sdk-js-tests).\n\n## Contributing\n\nThis client code is generated automatically. Any modifications will be overwritten the next time the `@aws-sdk/client-sts` package is updated.\nTo contribute to client you can check our [generate clients scripts](https://github.com/aws/aws-sdk-js-v3/tree/main/scripts/generate-clients).\n\n## License\n\nThis SDK is distributed under the\n[Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0),\nsee LICENSE for more information.\n\n## Client Commands (Operations List)\n\n