> ## Documentation Index > Fetch the complete documentation index at: https://www.vitalog.dev/llms.txt > Use this file to discover all available pages before exploring further. # Get browser session > Validate a browser session and read its expiry, server timezone and today's local date. Requires a vls_ Bearer token. ## OpenAPI ````yaml /openapi.json get /auth/session openapi: 3.1.1 info: title: Vitalog version: 1.0.1 description: >- Single-user structured observations with equivalent REST and MCP domain services. Environment AUTH_KEY or revocable personal Bearer keys with required name, permissions and explicit expiry (including Never); Primary key management requires AUTH_KEY; the UI uses separate, root-verified 30-minute management sessions. MCP clients use OAuth authorization code with S256 PKCE, issued after root sign-in. Clients are resolved through HTTPS metadata, pre-registration or dynamic registration. OAuth tokens grant MCP access only. servers: - url: https://vitalog-api.example.com description: Production REST and MCP API - url: http://localhost:3000 description: Loopback development; production requires TLS ingress security: [] paths: /auth/session: get: tags: - Browser sessions summary: Get browser session description: >- Validate a browser session and read its expiry, server timezone and today's local date. Requires a vls_ Bearer token. operationId: get_browser_session responses: '200': description: >- Validate a browser session and read its expiry, server timezone and today's local date. Requires a vls_ Bearer token. content: application/json: schema: $schema: https://json-schema.org/draft/2020-12/schema type: object properties: expires_at: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z))$ timezone: type: string today: type: string format: date pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))$ account: type: object properties: name: type: string minLength: 1 maxLength: 120 email: type: string format: email pattern: >- ^(?:[A-Za-z0-9_'+\-]+\.)*[A-Za-z0-9_'+\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\-]*\.)+[A-Za-z]{2,}$ preferences: type: object properties: dateFormat: $ref: '#/components/schemas/Schema_6728b482d4a4___schema0' timeFormat: $ref: '#/components/schemas/Schema_6728b482d4a4___schema1' timeZone: $ref: '#/components/schemas/Schema_6728b482d4a4___schema2' required: - dateFormat - timeFormat - timeZone additionalProperties: false description: >- Display preferences default to day-short-month-year, 24-hour and UTC. Saved choices and recorded dates remain unchanged. required: - name - email - preferences additionalProperties: false required: - expires_at - timezone - today - account additionalProperties: false '401': description: Authentication or request validation failed content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: Authentication or request validation failed content: application/json: schema: $ref: '#/components/schemas/Error' '413': description: Authentication or request validation failed content: application/json: schema: $ref: '#/components/schemas/Error' '422': description: Authentication or request validation failed content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Authentication or request validation failed content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Authentication or request validation failed content: application/json: schema: $ref: '#/components/schemas/Error' '503': description: Authentication or request validation failed content: application/json: schema: $ref: '#/components/schemas/Error' security: - browserSession: [] components: schemas: Schema_6728b482d4a4___schema0: type: string enum: - day-short-month-year - short-month-day-year - year-month-day - day-month-year - month-day-year Schema_6728b482d4a4___schema1: type: string enum: - 24-hour - 12-hour - 24-hour-seconds - 12-hour-seconds Schema_6728b482d4a4___schema2: type: string minLength: 1 maxLength: 100 Error: type: object additionalProperties: false required: - code - message - catalog_version - issues properties: code: type: string enum: - VALIDATION_ERROR - NOT_FOUND - VERSION_CONFLICT - IDEMPOTENCY_CONFLICT - DAILY_TOTAL_EXISTS - CATALOG_VERSION_MISMATCH - LIMIT_EXCEEDED - UNAUTHORIZED - FORBIDDEN - RATE_LIMITED - UNAVAILABLE - TIMEOUT - INTERNAL_ERROR message: type: string catalog_version: type: string issues: type: array items: type: object properties: path: type: string reason: type: string message: type: string suggested_keys: type: array items: type: string discovery: type: object existing_id: type: string current_version: type: integer current_catalog_version: type: string securitySchemes: browserSession: type: http scheme: bearer description: >- Opaque vls_ browser token, valid for 30 days unless revoked. Read-only REST access. The UI stores it in a host-only HttpOnly SameSite=Lax cookie; it never reaches browser JavaScript. Key administration and MCP reject this token. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.