openapi: 3.1.0
info:
  title: Fauna Core HTTP API
  description: >-
    The Fauna Core HTTP API provides direct access to the Fauna serverless
    document database through HTTPS endpoints. It allows developers to execute
    Fauna Query Language (FQL) queries, manage databases, perform CRUD
    operations on documents, manage schema as FSL files, and consume change
    data capture events via event feeds. The API uses token-based
    authentication and supports features such as transactions, indexes, and
    set operations. It serves as the foundation upon which Fauna's client
    drivers and SDKs are built.
  version: '1'
  contact:
    name: Fauna Support
    url: https://support.fauna.com
  termsOfService: https://fauna.com/terms
externalDocs:
  description: Fauna Core HTTP API Documentation
  url: https://docs.fauna.com/fauna/current/reference/http/reference/core-api/
servers:
  - url: https://db.fauna.com
    description: Fauna Global Production Server
tags:
  - name: EventFeeds
    description: >-
      Poll-based change data capture using event feeds. Retrieve batches of
      change events at your own pace for scheduled synchronization and batch
      processing workflows.
  - name: Query
    description: >-
      Execute Fauna Query Language (FQL) queries against a Fauna database.
  - name: Schema
    description: >-
      Fetch, update, validate, and manage a database's schema as FSL files.
      Supports staged schema changes with status checking, committing, and
      abandoning.
security:
  - bearerAuth: []
paths:
  /query/1:
    post:
      operationId: executeQuery
      summary: Execute an FQL query
      description: >-
        Executes a Fauna Query Language (FQL) v10 query against the
        authenticated database. Each query is an independently authenticated
        request. The request body contains the FQL query string and optional
        arguments. The response includes the query result data, transaction
        timestamp, and operational statistics.
      tags:
        - Query
      parameters:
        - $ref: '#/components/parameters/XFormat'
        - $ref: '#/components/parameters/XTypecheck'
        - $ref: '#/components/parameters/XLinearized'
        - $ref: '#/components/parameters/XQueryTimeout'
        - $ref: '#/components/parameters/XLastTxnTs'
        - $ref: '#/components/parameters/XQueryTags'
        - $ref: '#/components/parameters/XTraceparent'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/QueryRequest'
      responses:
        '200':
          description: Query executed successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QueryResponse'
        '400':
          description: Bad request due to malformed query or invalid parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized due to invalid or missing authentication secret
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden due to insufficient privileges
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: Conflict due to contention on the requested resource
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Rate limit exceeded
          headers:
            X-Rate-Limited-Ops:
              description: Operations that were rate limited
              schema:
                type: string
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '440':
          description: Query timeout exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /feed/1:
    post:
      operationId: pollEventFeed
      summary: Poll an event feed
      description: >-
        Retrieves a page of change data capture events from an event source
        using a polling-based approach. Event feeds allow developers to
        retrieve batches of change events at their own pace rather than
        maintaining a persistent connection. Specify a start timestamp for
        the initial request and use cursors for subsequent pagination.
      tags:
        - EventFeeds
      parameters:
        - $ref: '#/components/parameters/XFormat'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/EventFeedRequest'
      responses:
        '200':
          description: Event feed page retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EventFeedResponse'
        '400':
          description: Bad request due to invalid token or parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized due to invalid or missing authentication secret
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /schema/1/files:
    get:
      operationId: getSchemaFiles
      summary: Get schema files
      description: >-
        Retrieves the FSL schema files for the authenticated database. Returns
        the active schema files or staged schema files if a staged schema
        change is in progress. Requires an authentication secret with the
        built-in admin, server, or server-readonly role.
      tags:
        - Schema
      parameters:
        - name: staged
          in: query
          description: >-
            If true, return staged schema files instead of active schema files.
          schema:
            type: boolean
            default: false
        - name: version
          in: query
          description: >-
            Schema version timestamp to retrieve a specific version of the
            schema files.
          schema:
            type: integer
            format: int64
      responses:
        '200':
          description: Schema files retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SchemaFilesResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden due to insufficient role
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /schema/1/update:
    post:
      operationId: updateSchemaFiles
      summary: Update schema files
      description: >-
        Updates the FSL schema files for the authenticated database. You can
        push schema changes as staged changes or apply them immediately. Each
        form-data field corresponds to a file name and contains the FSL file
        content. A database can have up to 1024 FSL files. Requires an
        authentication secret with the built-in admin role.
      tags:
        - Schema
      parameters:
        - name: staged
          in: query
          description: >-
            If true, stage the schema changes instead of applying immediately.
          schema:
            type: boolean
            default: false
        - name: version
          in: query
          description: >-
            Expected schema version. The request fails if the version does
            not match the current schema version.
          schema:
            type: integer
            format: int64
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              additionalProperties:
                type: string
                description: >-
                  FSL file content. The field name is the file name including
                  any relative path.
      responses:
        '200':
          description: Schema updated successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SchemaUpdateResponse'
        '400':
          description: Schema validation failed
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden due to insufficient role
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: Schema version conflict
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /schema/1/validate:
    post:
      operationId: validateSchemaFiles
      summary: Validate schema files
      description: >-
        Validates the provided FSL schema files against the current schema
        without applying any changes. Returns a diff between the proposed
        and current schema. Useful for previewing changes before pushing.
      tags:
        - Schema
      parameters:
        - name: staged
          in: query
          description: >-
            If true, validate against staged schema instead of active schema.
          schema:
            type: boolean
            default: false
        - name: version
          in: query
          description: >-
            Expected schema version for validation.
          schema:
            type: integer
            format: int64
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              additionalProperties:
                type: string
                description: >-
                  FSL file content to validate.
      responses:
        '200':
          description: Validation result with diff
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SchemaValidationResponse'
        '400':
          description: Validation failed
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /schema/1/status:
    get:
      operationId: getStagedSchemaStatus
      summary: Get staged schema status
      description: >-
        Gets the index build status for the database's current staged schema.
        You can only commit staged schema with a status of ready. If format
        is specified, the request also returns a diff between the staged and
        active schema. Requires an authentication secret with the built-in
        admin, server, or server-readonly role.
      tags:
        - Schema
      parameters:
        - name: version
          in: query
          description: >-
            Expected schema version.
          schema:
            type: integer
            format: int64
      responses:
        '200':
          description: Staged schema status retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SchemaStatusResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /schema/1/staged/commit:
    post:
      operationId: commitStagedSchema
      summary: Commit staged schema
      description: >-
        Applies the currently staged schema change to the database. You can
        only commit a staged schema that has a status of ready. This is the
        API equivalent of the fauna schema commit CLI command.
      tags:
        - Schema
      parameters:
        - name: version
          in: query
          description: >-
            Expected schema version.
          schema:
            type: integer
            format: int64
      responses:
        '200':
          description: Staged schema committed successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SchemaCommitResponse'
        '400':
          description: Cannot commit schema that is not ready
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /schema/1/staged/abandon:
    post:
      operationId: abandonStagedSchema
      summary: Abandon staged schema
      description: >-
        Discards the currently staged schema change. You can abandon a staged
        schema change at any time including changes with a ready status. This
        is the API equivalent of the fauna schema abandon CLI command.
      tags:
        - Schema
      parameters:
        - name: version
          in: query
          description: >-
            Expected schema version.
          schema:
            type: integer
            format: int64
      responses:
        '200':
          description: Staged schema abandoned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SchemaAbandonResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        Fauna authentication secret passed as a bearer token. Secrets can be
        keys, tokens, or JWTs from third-party identity providers.
  parameters:
    XFormat:
      name: X-Format
      in: header
      description: >-
        Specifies the data format used to encode FQL values in query results
        and arguments. Supported values are tagged and simple.
      schema:
        type: string
        enum:
          - tagged
          - simple
    XTypecheck:
      name: X-Typecheck
      in: header
      description: >-
        If true, enables type checking for the query. Fauna validates the
        query against the database schema before executing.
      schema:
        type: boolean
    XLinearized:
      name: X-Linearized
      in: header
      description: >-
        If true, enforces strict serializability by ensuring reads reflect
        all prior committed transactions.
      schema:
        type: boolean
    XQueryTimeout:
      name: X-Query-Timeout-Ms
      in: header
      description: >-
        Query timeout in milliseconds. If the query exceeds this time, Fauna
        returns a 440 timeout error.
      schema:
        type: integer
        minimum: 1
    XLastTxnTs:
      name: X-Last-Txn-Ts
      in: header
      description: >-
        Last known transaction timestamp in microseconds since the Unix
        epoch. Used for snapshot isolation to ensure reads are at least as
        recent as this timestamp.
      schema:
        type: integer
        format: int64
    XQueryTags:
      name: X-Query-Tags
      in: header
      description: >-
        Arbitrary tags to associate with the query for logging and monitoring.
        Format is key=value pairs separated by commas.
      schema:
        type: string
    XTraceparent:
      name: traceparent
      in: header
      description: >-
        W3C Trace Context traceparent header for distributed tracing.
      schema:
        type: string
  schemas:
    QueryRequest:
      type: object
      required:
        - query
      properties:
        query:
          type: string
          description: >-
            The FQL v10 query string to execute.
        arguments:
          type: object
          additionalProperties: true
          description: >-
            Optional named arguments to pass to the query. Arguments are
            available as variables in the FQL query.
    QueryResponse:
      type: object
      properties:
        data:
          description: >-
            The query result data. The structure depends on the query
            executed and the X-Format header.
        static_type:
          type: string
          description: >-
            The static type of the query result as determined by Fauna's
            type system.
        txn_ts:
          type: integer
          format: int64
          description: >-
            Transaction timestamp in microseconds since the Unix epoch.
        stats:
          $ref: '#/components/schemas/QueryStats'
        schema_version:
          type: integer
          format: int64
          description: >-
            The schema version at the time the query was executed.
        summary:
          type: string
          description: >-
            Optional summary information about the query execution.
        query_tags:
          type: string
          description: >-
            Tags associated with the query for logging and monitoring.
    QueryStats:
      type: object
      description: >-
        Operational statistics for the query execution.
      properties:
        compute_ops:
          type: integer
          description: >-
            Number of Transactional Compute Operations consumed.
        read_ops:
          type: integer
          description: >-
            Number of Transactional Read Operations consumed.
        write_ops:
          type: integer
          description: >-
            Number of Transactional Write Operations consumed.
        query_time_ms:
          type: integer
          description: >-
            Query execution time in milliseconds.
        contention_retries:
          type: integer
          description: >-
            Number of times the transaction was retried due to contention.
        storage_bytes_read:
          type: integer
          description: >-
            Number of bytes read from storage.
        storage_bytes_write:
          type: integer
          description: >-
            Number of bytes written to storage.
        rate_limits_hit:
          type: array
          items:
            type: string
          description: >-
            List of rate limits that were hit during query execution.
    EventFeedRequest:
      type: object
      required:
        - token
      properties:
        token:
          type: string
          description: >-
            The event source token obtained from an FQL query that returns
            an event source.
        cursor:
          type: string
          description: >-
            Cursor from a previous event feed response for pagination.
            Mutually exclusive with start_ts.
        start_ts:
          type: integer
          format: int64
          description: >-
            Start timestamp in microseconds since the Unix epoch. Fauna
            returns events that occurred after this timestamp. Mutually
            exclusive with cursor.
        page_size:
          type: integer
          minimum: 1
          maximum: 16000
          default: 16
          description: >-
            Maximum number of events to return per page. Must be between
            1 and 16000 inclusive.
    EventFeedResponse:
      type: object
      properties:
        events:
          type: array
          items:
            $ref: '#/components/schemas/Event'
          description: >-
            Array of change events for the current page.
        cursor:
          type: string
          description: >-
            Cursor to use for fetching the next page of events.
        has_next:
          type: boolean
          description: >-
            Indicates whether more pages of events are available.
        stats:
          $ref: '#/components/schemas/EventStats'
    Event:
      type: object
      properties:
        type:
          type: string
          enum:
            - add
            - remove
            - update
            - status
          description: >-
            The type of change event.
        txn_ts:
          type: integer
          format: int64
          description: >-
            Transaction timestamp of the event in microseconds since the
            Unix epoch.
        cursor:
          type: string
          description: >-
            Cursor for this specific event.
        data:
          type: object
          additionalProperties: true
          description: >-
            The document data associated with the event.
    EventStats:
      type: object
      description: >-
        Aggregated statistics for all events in the page.
      properties:
        read_ops:
          type: integer
          description: >-
            Number of Transactional Read Operations consumed.
        storage_bytes_read:
          type: integer
          description: >-
            Number of bytes read from storage.
        compute_ops:
          type: integer
          description: >-
            Number of Transactional Compute Operations consumed.
        processing_time_ms:
          type: integer
          description: >-
            Processing time in milliseconds.
        rate_limits_hit:
          type: array
          items:
            type: string
          description: >-
            List of rate limits that were hit.
    SchemaFilesResponse:
      type: object
      properties:
        version:
          type: integer
          format: int64
          description: >-
            Schema version timestamp.
        files:
          type: array
          items:
            $ref: '#/components/schemas/SchemaFile'
          description: >-
            Array of FSL schema files.
    SchemaFile:
      type: object
      properties:
        filename:
          type: string
          description: >-
            Name of the FSL file including any relative path.
        content:
          type: string
          description: >-
            Contents of the FSL schema file.
    SchemaUpdateResponse:
      type: object
      properties:
        version:
          type: integer
          format: int64
          description: >-
            New schema version timestamp after the update.
        diff:
          type: string
          description: >-
            Diff between the previous and updated schema.
    SchemaValidationResponse:
      type: object
      properties:
        version:
          type: integer
          format: int64
          description: >-
            Current schema version.
        diff:
          type: string
          description: >-
            Diff between the proposed and current schema.
        valid:
          type: boolean
          description: >-
            Whether the proposed schema is valid.
    SchemaStatusResponse:
      type: object
      properties:
        version:
          type: integer
          format: int64
          description: >-
            Schema version timestamp.
        status:
          type: string
          enum:
            - none
            - pending
            - ready
            - failed
          description: >-
            Index build status for the staged schema. Only schemas with
            a ready status can be committed.
        diff:
          type: string
          description: >-
            Diff between the staged and active schema if format was specified.
    SchemaCommitResponse:
      type: object
      properties:
        version:
          type: integer
          format: int64
          description: >-
            New active schema version after committing.
    SchemaAbandonResponse:
      type: object
      properties:
        version:
          type: integer
          format: int64
          description: >-
            Active schema version after abandoning the staged change.
    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              description: >-
                Machine-readable error code. Error codes are part of the API
                contract and are safe to write programmatic logic against.
            message:
              type: string
              description: >-
                Human-readable error message describing the failure.
            constraint_failures:
              type: array
              items:
                type: object
                properties:
                  paths:
                    type: array
                    items:
                      type: array
                      items:
                        type: string
                  message:
                    type: string
              description: >-
                Details about check or unique constraint failures.
          required:
            - code
            - message
        summary:
          type: string
          description: >-
            Detailed error information including the location of the error
            in the query.
        txn_ts:
          type: integer
          format: int64
          description: >-
            Transaction timestamp of the failed request.
        stats:
          $ref: '#/components/schemas/QueryStats'
        schema_version:
          type: integer
          format: int64
          description: >-
            Schema version at the time of the failed request.