> ## Documentation Index > Fetch the complete documentation index at: https://docs.baselayer.com/llms.txt > Use this file to discover all available pages before exploring further. # Mint a browser key > Mints a browser public key for your application, the `browserKey` baselayer.js sends. The key is in this response only: Baselayer cannot show it again, so store it now. An application has at most 2 live keys, so a rotation can overlap; at the limit, revoke a key first. Baselayer accepts a new key usually within about 20 seconds, and within about 5 minutes once publishing is healthy. ## OpenAPI ````yaml /api-reference/openapi.json post /acceptance/browser_keys openapi: 3.1.0 info: title: baselayer-api-service version: 0.1.0 servers: - url: https://api.baselayer.com/ security: [] paths: /acceptance/browser_keys: post: tags: - Acceptance summary: Mint a browser key description: >- Mints a browser public key for your application, the `browserKey` baselayer.js sends. The key is in this response only: Baselayer cannot show it again, so store it now. An application has at most 2 live keys, so a rotation can overlap; at the limit, revoke a key first. Baselayer accepts a new key usually within about 20 seconds, and within about 5 minutes once publishing is healthy. operationId: acceptance_browser_keys_create requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/v1.AcceptanceBrowserKeyRequest' application/vnd.baselayer.v1+json: schema: $ref: '#/components/schemas/v1.AcceptanceBrowserKeyRequest' responses: '201': description: The key, with `browser_key`. content: application/json: schema: $ref: '#/components/schemas/v1.AcceptanceBrowserKeyMinted' application/vnd.baselayer.v1+json: schema: $ref: '#/components/schemas/v1.AcceptanceBrowserKeyMinted' headers: Location: description: The new key. schema: type: string '409': description: The application already has the maximum number of live keys. content: application/json: schema: $ref: '#/components/schemas/Error' title: BrowserKeyLimitReached description: >- The application already has the maximum number of live browser keys; revoke one first. See metadata for the limit. examples: - type: browser_key_limit_reached code: 7250 message: >- The application already has the maximum number of live browser keys; revoke one first. See metadata for the limit. metadata: {} '422': description: The request is invalid. content: application/json: schema: $ref: '#/components/schemas/Error' title: ValidationFailed description: The request is invalid. examples: - type: validation_failed code: 7112 message: The request is invalid. metadata: {} security: - APIKeyHeader: [] components: schemas: v1.AcceptanceBrowserKeyRequest: additionalProperties: false description: A browser key to mint. properties: label: description: What the key is for, such as the site it ships on. maxLength: 100 minLength: 1 title: Label type: string required: - label title: AcceptanceBrowserKeyRequest (v1) type: object v1.AcceptanceBrowserKeyMinted: description: 'A key just minted: the only response that carries the key itself.' properties: browser_key_id: description: The key's id. format: uuid title: Browser Key Id type: string label: description: What the key is for. title: Label type: string environment: $ref: '#/components/schemas/v1.ApplicationType' description: The application's environment. created_at: description: When the key was minted. format: date-time title: Created At type: string created_by: $ref: '#/components/schemas/v1.ActedBy' description: Who minted it. revoked_at: anyOf: - format: date-time type: string - type: 'null' default: null description: When it was revoked; null while it is live. title: Revoked At browser_key: description: >- The key, for baselayer.js's `browserKey`. Shown only in this response; Baselayer stores its sha256, so it cannot be shown again. title: Browser Key type: string required: - browser_key_id - label - environment - created_at - created_by - browser_key title: AcceptanceBrowserKeyMinted (v1) type: object Error: properties: type: type: string title: Type description: >- Stable snake_case name of the error. Branch on this, never on `message`. code: type: integer title: Code description: Integer catalog code of the error. message: type: string title: Message description: For a human reading a log; not stable and not localized. metadata: additionalProperties: true type: object title: Metadata description: Context documented per `type`. request_id: anyOf: - type: string - type: 'null' title: Request Id description: The `X-Request-ID` of the failed request. type: object required: - type - code - message title: Error description: The one body of every error a KYA route answers. v1.ApplicationType: enum: - sandbox - production title: ApplicationType type: string v1.ActedBy: description: |- Who acted on a record, as they were named when they acted: the one actor shape every route answers. properties: kind: $ref: '#/components/schemas/v1.ActedByKind' description: '`USER` for a console user, `API_KEY` for a key.' label: description: >- The user's first and last name or the API key's name, as they were when they acted; never rewritten by a later rename or deletion. title: Label type: string required: - kind - label title: ActedBy (v1) type: object v1.ActedByKind: description: 'Who acted on a record: a console user or an API key.' enum: - USER - API_KEY title: ActedByKind type: string securitySchemes: APIKeyHeader: type: apiKey in: header name: X-API-Key ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.