openapi: 3.0.3
info:
  title: QStash Dead Letter Queue Queues API
  description: QStash is a serverless message queue and task scheduling REST API from Upstash that delivers HTTP messages to endpoints reliably without requiring any long-lived connections or infrastructure management. Built entirely on stateless HTTP requests, it is designed for serverless and edge runtimes where traditional message brokers are impractical. QStash supports automatic retries, CRON-based scheduling up to one year in advance, URL group broadcasting for fan-out delivery, FIFO queuing, dead-letter queues, and message deduplication.
  version: '2.0'
  contact:
    name: Upstash Support
    url: https://upstash.com/docs/qstash/overall/getstarted
  license:
    name: Upstash Terms of Service
    url: https://upstash.com/trust/terms.pdf
servers:
- url: https://qstash.upstash.io/v2
  description: QStash production API
security:
- BearerAuth: []
tags:
- name: Queues
  description: Manage FIFO queues
paths:
  /enqueue/{queueName}/{destination}:
    post:
      operationId: enqueueMessage
      summary: Enqueue a message to a FIFO queue
      description: Add a message to the specified FIFO queue for ordered delivery to the destination URL.
      tags:
      - Queues
      parameters:
      - name: queueName
        in: path
        required: true
        description: Name of the target queue
        schema:
          type: string
      - name: destination
        in: path
        required: true
        description: Destination URL for message delivery
        schema:
          type: string
      - name: Upstash-Delay
        in: header
        description: Delay message delivery by this duration
        schema:
          type: string
      - name: Upstash-Retries
        in: header
        description: Number of retry attempts
        schema:
          type: integer
      - name: Upstash-Deduplication-Id
        in: header
        description: Manual deduplication ID
        schema:
          type: string
      requestBody:
        description: Message payload
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
      responses:
        '201':
          description: Message enqueued successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PublishResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
  /queues/:
    post:
      operationId: upsertQueue
      summary: Create or update a queue
      description: Create a new queue or update an existing queue's configuration such as parallelism. Queues provide FIFO ordered message delivery.
      tags:
      - Queues
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/QueueUpsert'
            example:
              queueName: my-queue
              parallelism: 2
      responses:
        '200':
          description: Queue created or updated
        '401':
          $ref: '#/components/responses/Unauthorized'
  /queues/{queueName}:
    get:
      operationId: getQueue
      summary: Get queue details
      description: Retrieve configuration and status of a named queue.
      tags:
      - Queues
      parameters:
      - name: queueName
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Queue details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Queue'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      operationId: deleteQueue
      summary: Delete a queue
      description: Delete a queue and all its pending messages.
      tags:
      - Queues
      parameters:
      - name: queueName
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Queue deleted
        '404':
          $ref: '#/components/responses/NotFound'
  /queues/{queueName}/pause:
    post:
      operationId: pauseQueue
      summary: Pause a queue
      description: Pause delivery for a named queue.
      tags:
      - Queues
      parameters:
      - name: queueName
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Queue paused
  /queues/{queueName}/resume:
    post:
      operationId: resumeQueue
      summary: Resume a paused queue
      description: Resume delivery for a paused queue.
      tags:
      - Queues
      parameters:
      - name: queueName
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Queue resumed
components:
  responses:
    RateLimited:
      description: Rate limit exceeded
      headers:
        Burst-RateLimit-Limit:
          description: Maximum requests allowed in the current 1-second window
          schema:
            type: integer
        Burst-RateLimit-Remaining:
          description: Requests remaining in the current window
          schema:
            type: integer
        Burst-RateLimit-Reset:
          description: Unix timestamp when the rate limit window resets
          schema:
            type: integer
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Unauthorized:
      description: Missing or invalid authentication token
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    NotFound:
      description: Resource not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  schemas:
    QueueUpsert:
      type: object
      required:
      - queueName
      properties:
        queueName:
          type: string
          description: Name of the queue (alphanumeric, hyphen, underscore)
        parallelism:
          type: integer
          minimum: 1
          description: Maximum number of messages to deliver in parallel (default 1)
    ErrorResponse:
      type: object
      properties:
        error:
          type: string
          description: Human-readable error message
    PublishResponse:
      type: object
      properties:
        messageId:
          type: string
          description: Unique identifier for the published message
          example: msg_2XavMmRcJHJf7HkNtNqjfVf8uQe
        url:
          type: string
          description: Destination URL the message will be delivered to
          example: https://example.com/webhook
    Queue:
      type: object
      properties:
        name:
          type: string
          description: Queue name
        parallelism:
          type: integer
          description: Configured parallelism level
        paused:
          type: boolean
          description: Whether the queue is currently paused
        pendingMessages:
          type: integer
          description: Number of messages currently pending delivery
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: Bearer token obtained from the Upstash console at https://console.upstash.com/qstash. Alternatively, pass as query parameter `qstash_token`.
externalDocs:
  description: QStash Documentation
  url: https://upstash.com/docs/qstash/overall/getstarted