Kurrent

Kurrent Streams API

Append to, read from and manage event streams

GitHub OpenAPI

Operations 11

GET /streams/{stream} Read events from a stream #
POST /streams/{stream} Append one or more events to a stream #
DELETE /streams/{stream} Delete a stream #
POST /streams/{stream}/incoming/{guid} Append a single event using a client-supplied event id (idempotent append URL) #
GET /streams/{stream}/metadata Read the metadata of a stream #
POST /streams/{stream}/metadata Update the metadata of a stream #
GET /streams/{stream}/{event} Read a single event from a stream #
GET /streams/{stream}/{event}/{count} Read a page of events from a stream starting at an event number #
GET /streams/{stream}/{event}/backward/{count} Page backward through a stream from an event number #
GET /streams/{stream}/{event}/forward/{count} Page forward through a stream from an event number #
GET /streams/$all Read events from the $all stream #

Documentation

📖
Documentation
https://docs.kurrent.io/server/v26.1/http-api/introduction.html
📖
APIReference
https://docs.kurrent.io/server/v26.1/http-api/api.html
📖
Authentication
https://docs.kurrent.io/server/v26.1/http-api/security.html

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/kurrent/refs/heads/main/openapi/kurrent-streams-api-openapi.yml

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OpenAPI Specification

kurrent-streams-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: KurrentDB HTTP Streams API
  version: v26.1
  summary: AtomPub-over-HTTP interface to KurrentDB streams, subscriptions, projections, users and node administration.
  description: KurrentDB (formerly EventStoreDB) exposes a native AtomPub-over-HTTP interface alongside its primary gRPC protocol.
  contact:
    name: Kurrent
    url: https://www.kurrent.io/
  license:
    name: Kurrent License
    url: https://www.kurrent.io/terms-of-use
  x-apievangelist-provenance:
    generated: '2026-07-19'
    method: generated
    source: https://docs.kurrent.io/server/v26.1/http-api/api.html
    note: Faithful transcription of the provider's published HTTP API reference table. Operation summaries mirror the reference; request/response schemas are intentionally left open where the provider does not publish them.
servers:
- url: https://{host}:{port}
  description: Your KurrentDB node or Kurrent Cloud cluster
  variables:
    host:
      default: localhost
      description: Hostname of the KurrentDB node (the same host you use for the admin UI)
    port:
      default: '2113'
      description: KurrentDB HTTP port
security:
- basicAuth: []
tags:
- name: Streams
  description: Append to, read from and manage event streams
paths:
  /streams/{stream}:
    parameters:
    - $ref: '#/components/parameters/Stream'
    get:
      tags:
      - Streams
      operationId: readStream
      summary: Read events from a stream
      parameters:
      - $ref: '#/components/parameters/RequireLeader'
      responses:
        '200':
          $ref: '#/components/responses/StreamFeed'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      tags:
      - Streams
      operationId: appendToStream
      summary: Append one or more events to a stream
      parameters:
      - $ref: '#/components/parameters/ExpectedVersion'
      - $ref: '#/components/parameters/EventType'
      - $ref: '#/components/parameters/EventId'
      - $ref: '#/components/parameters/RequireLeader'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/EventBatch'
          application/vnd.kurrent.events+json:
            schema:
              $ref: '#/components/schemas/EventBatch'
      responses:
        '201':
          $ref: '#/components/responses/Created'
        '307':
          description: Temporary Redirect — the request must be forwarded to the leader node
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
    delete:
      tags:
      - Streams
      operationId: deleteStream
      summary: Delete a stream
      parameters:
      - $ref: '#/components/parameters/ExpectedVersion'
      - $ref: '#/components/parameters/RequireLeader'
      responses:
        '204':
          description: No Content — the stream was deleted
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /streams/{stream}/incoming/{guid}:
    parameters:
    - $ref: '#/components/parameters/Stream'
    - name: guid
      in: path
      required: true
      description: Client-generated event id, used as the idempotency key for this append
      schema:
        type: string
        format: uuid
    post:
      tags:
      - Streams
      operationId: appendEventToStreamIdempotent
      summary: Append a single event using a client-supplied event id (idempotent append URL)
      parameters:
      - $ref: '#/components/parameters/ExpectedVersion'
      - $ref: '#/components/parameters/EventType'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              description: The event body
      responses:
        '201':
          $ref: '#/components/responses/Created'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /streams/{stream}/metadata:
    parameters:
    - $ref: '#/components/parameters/Stream'
    get:
      tags:
      - Streams
      operationId: readStreamMetadata
      summary: Read the metadata of a stream
      responses:
        '200':
          $ref: '#/components/responses/JsonOk'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      tags:
      - Streams
      operationId: updateStreamMetadata
      summary: Update the metadata of a stream
      parameters:
      - $ref: '#/components/parameters/ExpectedVersion'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/StreamMetadata'
      responses:
        '201':
          $ref: '#/components/responses/Created'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /streams/{stream}/{event}:
    parameters:
    - $ref: '#/components/parameters/Stream'
    - $ref: '#/components/parameters/EventNumber'
    get:
      tags:
      - Streams
      operationId: readEvent
      summary: Read a single event from a stream
      responses:
        '200':
          $ref: '#/components/responses/JsonOk'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /streams/{stream}/{event}/{count}:
    parameters:
    - $ref: '#/components/parameters/Stream'
    - $ref: '#/components/parameters/EventNumber'
    - $ref: '#/components/parameters/Count'
    get:
      tags:
      - Streams
      operationId: readEvents
      summary: Read a page of events from a stream starting at an event number
      responses:
        '200':
          $ref: '#/components/responses/StreamFeed'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /streams/{stream}/{event}/backward/{count}:
    parameters:
    - $ref: '#/components/parameters/Stream'
    - $ref: '#/components/parameters/EventNumber'
    - $ref: '#/components/parameters/Count'
    get:
      tags:
      - Streams
      operationId: readEventsBackward
      summary: Page backward through a stream from an event number
      responses:
        '200':
          $ref: '#/components/responses/StreamFeed'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /streams/{stream}/{event}/forward/{count}:
    parameters:
    - $ref: '#/components/parameters/Stream'
    - $ref: '#/components/parameters/EventNumber'
    - $ref: '#/components/parameters/Count'
    get:
      tags:
      - Streams
      operationId: readEventsForward
      summary: Page forward through a stream from an event number
      responses:
        '200':
          $ref: '#/components/responses/StreamFeed'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /streams/$all:
    get:
      tags:
      - Streams
      operationId: readAllStream
      summary: Read events from the $all stream
      parameters:
      - $ref: '#/components/parameters/RequireLeader'
      responses:
        '200':
          $ref: '#/components/responses/StreamFeed'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    BadRequest:
      description: Bad Request — the request was malformed or violated an expected version
      content:
        text/plain:
          schema:
            type: string
    NotFound:
      description: Not Found — the stream, event, projection, subscription or user does not exist
      content:
        text/plain:
          schema:
            type: string
    Created:
      description: Created
      headers:
        Location:
          description: URI of the created resource
          schema:
            type: string
    Unauthorized:
      description: Unauthorized — credentials were missing, invalid, or lacked ACL permission
      content:
        text/plain:
          schema:
            type: string
    StreamFeed:
      description: OK — an AtomPub feed of events
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/AtomFeed'
        application/atom+xml:
          schema:
            type: string
        application/xml:
          schema:
            type: string
    JsonOk:
      description: OK
      content:
        application/json:
          schema:
            type: object
  parameters:
    EventNumber:
      name: event
      in: path
      required: true
      description: Event number within the stream, or "head" for the latest event
      schema:
        type: string
    EventType:
      name: Kurrent-EventType
      in: header
      description: The event type of the posted body
      schema:
        type: string
    RequireLeader:
      name: Kurrent-RequireLeader
      in: header
      description: Require that the request is served by the leader node rather than a follower
      schema:
        type: boolean
    Stream:
      name: stream
      in: path
      required: true
      description: Name of the event stream
      schema:
        type: string
    ExpectedVersion:
      name: Kurrent-ExpectedVersion
      in: header
      description: The version the stream is expected to be at, used for optimistic concurrency control
      schema:
        type: integer
    Count:
      name: count
      in: path
      required: true
      description: Number of events to return
      schema:
        type: integer
    EventId:
      name: Kurrent-EventId
      in: header
      description: The unique identifier of the posted event. Supplying it makes the append idempotent — a repeated append with the same id is not written twice.
      schema:
        type: string
        format: uuid
  schemas:
    AtomLink:
      type: object
      description: A navigation link in an AtomPub feed (first, last, previous, next, metadata)
      properties:
        uri:
          type: string
        relation:
          type: string
    AtomEntry:
      type: object
      description: A single event entry in an AtomPub feed
      properties:
        eventId:
          type: string
          format: uuid
        eventType:
          type: string
        eventNumber:
          type: integer
        streamId:
          type: string
        isJson:
          type: boolean
        isMetaData:
          type: boolean
        isLinkMetaData:
          type: boolean
        positionEventNumber:
          type: integer
        positionStreamId:
          type: string
        title:
          type: string
        id:
          type: string
        updated:
          type: string
          format: date-time
        data:
          description: The event payload
        metaData:
          description: The event metadata
        links:
          type: array
          items:
            $ref: '#/components/schemas/AtomLink'
    Event:
      type: object
      description: A single event written to a KurrentDB stream
      properties:
        eventId:
          type: string
          format: uuid
          description: Client-generated unique identifier for the event; makes the append idempotent
        eventType:
          type: string
          description: The type name of the event
        data:
          description: The event payload
        metadata:
          description: Optional event metadata
      required:
      - eventId
      - eventType
      - data
    EventBatch:
      type: array
      description: One or more events to append to a stream
      items:
        $ref: '#/components/schemas/Event'
    AtomFeed:
      type: object
      description: An AtomPub feed of events from a stream
      properties:
        title:
          type: string
        id:
          type: string
        updated:
          type: string
          format: date-time
        streamId:
          type: string
        author:
          type: object
          properties:
            name:
              type: string
        headOfStream:
          type: boolean
        links:
          type: array
          items:
            $ref: '#/components/schemas/AtomLink'
        entries:
          type: array
          items:
            $ref: '#/components/schemas/AtomEntry'
    StreamAcl:
      type: object
      description: Access control list applied to a stream
      properties:
        $r:
          description: Users or groups allowed to read
        $w:
          description: Users or groups allowed to write
        $d:
          description: Users or groups allowed to delete
        $mr:
          description: Users or groups allowed to read metadata
        $mw:
          description: Users or groups allowed to write metadata
    StreamMetadata:
      type: object
      description: Metadata controlling the retention and access of a stream
      properties:
        $maxCount:
          type: integer
          description: Maximum number of events retained in the stream
        $maxAge:
          type: integer
          description: Maximum age in seconds of events retained in the stream
        $cacheControl:
          type: integer
          description: Cache control in seconds for the stream head
        $tb:
          type: integer
          description: Truncate-before event number
        $acl:
          $ref: '#/components/schemas/StreamAcl'
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: KurrentDB supports HTTP Basic authentication for the HTTP API, with access control lists (ACLs) applied per stream. See https://docs.kurrent.io/server/v26.1/http-api/security.html
externalDocs:
  description: KurrentDB HTTP API documentation
  url: https://docs.kurrent.io/server/v26.1/http-api/introduction.html