[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[],[],null,["# Class HmacKey (7.16.0)\n\nVersion latestkeyboard_arrow_down\n\n- [7.16.0 (latest)](/nodejs/docs/reference/storage/latest/storage/hmackey)\n- [7.13.0](/nodejs/docs/reference/storage/7.13.0/storage/hmackey)\n- [7.3.2](/nodejs/docs/reference/storage/7.3.2/storage/hmackey)\n- [7.2.0](/nodejs/docs/reference/storage/7.2.0/storage/hmackey)\n- [7.1.0](/nodejs/docs/reference/storage/7.1.0/storage/hmackey)\n- [7.0.1](/nodejs/docs/reference/storage/7.0.1/storage/hmackey)\n- [6.12.0](/nodejs/docs/reference/storage/6.12.0/storage/hmackey)\n- [6.11.0](/nodejs/docs/reference/storage/6.11.0/storage/hmackey)\n- [6.7.0](/nodejs/docs/reference/storage/6.7.0/storage/hmackey)\n- [6.6.0](/nodejs/docs/reference/storage/6.6.0/storage/hmackey)\n- [6.5.4](/nodejs/docs/reference/storage/6.5.4/storage/hmackey)\n- [6.4.2](/nodejs/docs/reference/storage/6.4.2/storage/hmackey)\n- [6.3.0](/nodejs/docs/reference/storage/6.3.0/storage/hmackey)\n- [6.2.3](/nodejs/docs/reference/storage/6.2.3/storage/hmackey)\n- [5.19.1](/nodejs/docs/reference/storage/5.19.1/storage/hmackey)\n- [5.18.3](/nodejs/docs/reference/storage/5.18.3/storage/hmackey)\n- [5.17.0](/nodejs/docs/reference/storage/5.17.0/storage/hmackey)\n- [5.16.1](/nodejs/docs/reference/storage/5.16.1/storage/hmackey)\n- [5.15.6](/nodejs/docs/reference/storage/5.15.6/storage/hmackey)\n- [5.14.8](/nodejs/docs/reference/storage/5.14.8/storage/hmackey)\n- [5.13.2](/nodejs/docs/reference/storage/5.13.2/storage/hmackey)\n- [5.12.0](/nodejs/docs/reference/storage/5.12.0/storage/hmackey)\n- [5.11.1](/nodejs/docs/reference/storage/5.11.1/storage/hmackey)\n- [5.10.0](/nodejs/docs/reference/storage/5.10.0/storage/hmackey)\n- [5.9.0](/nodejs/docs/reference/storage/5.9.0/storage/hmackey)\n- [5.8.5](/nodejs/docs/reference/storage/5.8.5/storage/hmackey) \nAn HmacKey object contains metadata of an HMAC key created from a service account through the client using .\n\nSee [HMAC keys documentation](https://cloud.google.com/storage/docs/authentication/hmackeys) \n\nInheritance\n-----------\n\nServiceObject\\\u003c[HmacKey](/nodejs/docs/reference/storage/latest/storage/hmackey), [HmacKeyMetadata](/nodejs/docs/reference/storage/latest/storage/hmackeymetadata)\\\u003e \\\u003e HmacKey\n\nPackage\n-------\n\n[@google-cloud/storage](../overview.html)\n\nConstructors\n------------\n\n### (constructor)(storage, accessId, options)\n\n constructor(storage: Storage, accessId: string, options?: HmacKeyOptions);\n\nConstructs an HmacKey object.\n\nNote: this only create a local reference to an HMAC key, to create an HMAC key, use .\n\n**Example** \n\n\n const {Storage} = require('https://cloud.google.com/nodejs/docs/reference/storage/latest/overview.html');\n const storage = new Storage();\n const hmacKey = storage.https://cloud.google.com/nodejs/docs/reference/storage/latest/storage/storage_2.html('access-id');\n\nProperties\n----------\n\n### storage\n\n storage: Storage;\n\nA reference to the associated with this [HmacKey](/nodejs/docs/reference/storage/latest/storage/hmackey) instance. HmacKey#storage {Storage}\n\nMethods\n-------\n\n### setMetadata(metadata, options)\n\n setMetadata(metadata: HmacKeyMetadata, options?: SetMetadataOptions): Promise\u003cSetMetadataResponse\u003cHmacKeyMetadata\u003e\u003e;\n\nSet the metadata for this object.\n\n### setMetadata(metadata, callback)\n\n setMetadata(metadata: HmacKeyMetadata, callback: MetadataCallback\u003cHmacKeyMetadata\u003e): void;\n\n### setMetadata(metadata, options, callback)\n\n setMetadata(metadata: HmacKeyMetadata, options: SetMetadataOptions, callback: MetadataCallback\u003cHmacKeyMetadata\u003e): void;"]]