> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fly.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Create App

> Create an app with the specified details in the request body.




## OpenAPI

````yaml /machines-api/openapi.json post /v1/apps
openapi: 3.0.1
info:
  title: Machines API
  description: >-
    This site hosts documentation generated from the Fly.io Machines API OpenAPI
    specification. Visit our complete [Machines API
    docs](https://fly.io/docs/machines/api/) for how to get started, more
    information about each endpoint, parameter descriptions, and examples.
  contact: {}
  license:
    name: Apache 2.0
    url: http://www.apache.org/licenses/LICENSE-2.0.html
  version: '1.0'
servers:
  - url: https://api.machines.dev
security: []
tags:
  - name: Apps
    description: >-
      This site hosts documentation generated from the Fly.io Machines API
      OpenAPI specification. Visit our complete [Machines API
      docs](https://fly.io/docs/machines/api/apps-resource/) for details about
      using the Apps resource.
  - name: Machines
    description: >-
      This site hosts documentation generated from the Fly.io Machines API
      OpenAPI specification. Visit our complete [Machines API
      docs](https://fly.io/docs/machines/api/machines-resource/) for details
      about using the Machines resource.
  - name: TLS Certificates
    description: >
      This site hosts documentation generated from the Fly.io Machines API
      OpenAPI specification. Visit our complete [Machines API
      docs](https://fly.io/docs/machines/api/certificates-resource/) for details
      about using the TLS Certificates resource.
  - name: Volumes
    description: >-
      This site hosts documentation generated from the Fly.io Machines API
      OpenAPI specification. Visit our complete [Machines API
      docs](https://fly.io/docs/machines/api/volumes-resource/) for details
      about using the Volumes resource.
  - name: Postgres Clusters
    description: >-
      Create and manage Postgres clusters, including databases, users,
      extensions, backups, and app attachments.
externalDocs:
  url: https://fly.io/docs/machines/working-with-machines/
paths:
  /v1/apps:
    post:
      tags:
        - Apps
      summary: Create App
      description: |
        Create an app with the specified details in the request body.
      operationId: Apps_create
      requestBody:
        description: App body
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateAppRequest'
        required: true
      responses:
        '201':
          description: Created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreateAppResponse'
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: >-
            Rejected by validation. status is name_taken when the app name is
            already in use.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    CreateAppRequest:
      type: object
      properties:
        enable_subdomains:
          type: boolean
        idempotency_key:
          type: string
          description: >-
            When set, makes a retry of this exact request safe: a

            second create with the same key and the same name (or no name)
            returns

            the app the first request created, instead of erroring on a false
            name

            conflict or creating a duplicate. A second create with the same key

            but a *different* name is rejected outright; it won't silently

            hand back the first app.
        name:
          type: string
        network:
          type: string
        org_slug:
          type: string
    CreateAppResponse:
      type: object
      properties:
        created_at:
          type: integer
        id:
          type: string
    ErrorResponse:
      type: object
      properties:
        details:
          type: object
          description: Deprecated
        error:
          type: string
        status:
          $ref: '#/components/schemas/main.statusCode'
    main.statusCode:
      type: string
      enum:
        - unknown
        - insufficient_capacity
        - volume_placement_capacity
        - name_taken
      x-enum-varnames:
        - unknown
        - capacityErr
        - volumePlacementCapacityErr
        - nameTakenErr

````