Langflow
Langflow Base API

The Base API from Langflow — 6 operation(s) for base.
Documentation GitHub OpenAPI
OpenAPI Specification

openapi: 3.1.0
info:
  title: Langflow Base API
  version: 1.9.0
tags:
- name: Base
paths:
  /api/v1/all:
    get:
      description: Retrieve all component types with compression for better performance.<br><br>Returns a compressed response containing all available component types.
      operationId: get_all_api_v1_all_get
      responses:
        '200':
          content:
            application/json:
              schema: {}
          description: Successful Response
      security:
      - OAuth2PasswordBearerCookie: []
      - API key query: []
      - API key header: []
      summary: Get All
      tags:
      - Base
  /api/v1/config:
    get:
      description: 'Retrieve application configuration settings.<br><br>Returns different configuration based on authentication status:<br>- Authenticated users: Full ConfigResponse with all settings<br>- Unauthenticated users: PublicConfigResponse with limited, safe-to-expose settings<br><br>Args:<br>    user: The authenticated user, or None if unauthenticated.<br><br>Returns:<br>    ConfigResponse | PublicConfigResponse: Configuration settings appropriate for the user''s auth status.<br><br>Raises:<br>    HTTPException: If an error occurs while retrieving the configuration.'
      operationId: get_config_api_v1_config_get
      responses:
        '200':
          content:
            application/json:
              schema:
                anyOf:
                - $ref: '#/components/schemas/ConfigResponse'
                - $ref: '#/components/schemas/PublicConfigResponse'
                title: Response Get Config Api V1 Config Get
          description: Successful Response
      security:
      - OAuth2PasswordBearerCookie: []
      - API key query: []
      - API key header: []
      summary: Get Config
      tags:
      - Base
  /api/v1/run/advanced/{flow_id_or_name}:
    post:
      description: 'Executes a specified flow by ID with optional input values, output selection, tweaks, and streaming capability.<br><br>This endpoint supports running flows with caching to enhance performance and efficiency.<br><br>### Parameters:<br>- `flow` (Flow): The flow object to be executed, resolved via dependency injection.<br>- `inputs` (List[InputValueRequest], optional): A list of inputs specifying the input values and components<br>  for the flow. Each input can target specific components and provide custom values.<br>- `outputs` (List[str], optional): A list of output names to retrieve from the executed flow.<br>  If not provided, all outputs are returned.<br>- `tweaks` (Optional[Tweaks], optional): A dictionary of tweaks to customize the flow execution.<br>  The tweaks can be used to modify the flow''s parameters and components.<br>  Tweaks can be overridden by the input values.<br>- `stream` (bool, optional): Specifies whether the results should be streamed. Defaults to False.<br>- `session_id` (Union[None, str], optional): An optional session ID to utilize existing session data for the flow<br>  execution.<br>- `api_key_user` (User): The user associated with the current API key. Automatically resolved from the API key.<br><br>### Returns:<br>A `RunResponse` object containing the selected outputs (or all if not specified) of the executed flow<br>and the session ID.<br>The structure of the response accommodates multiple inputs, providing a nested list of outputs for each input.<br><br>### Raises:<br>HTTPException: Indicates issues with finding the specified flow, invalid input formats, or internal errors during<br>flow execution.<br><br>### Example usage:<br>```json<br>POST /run/flow_id<br>x-api-key: YOUR_API_KEY<br>Payload:<br>{<br>    "inputs": [<br>        {"components": ["component1"], "input_value": "value1"},<br>        {"components": ["component3"], "input_value": "value2"}<br>    ],<br>    "outputs": ["Component Name", "component_id"],<br>    "tweaks": {"parameter_name": "value", "Component Name": {"parameter_name": "value"}, "component_id": {"parameter_name": "value"}}<br>    "stream": false<br>}<br>```<br><br>This endpoint facilitates complex flow executions with customized inputs, outputs, and configurations,<br>catering to diverse application requirements.'
      operationId: experimental_run_flow_api_v1_run_advanced__flow_id_or_name__post
      parameters:
      - in: path
        name: flow_id_or_name
        required: true
        schema:
          title: Flow Id Or Name
          type: string
      - in: query
        name: user_id
        required: false
        schema:
          anyOf:
          - type: string
          - format: uuid
            type: string
          - type: 'null'
          title: User Id
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Body_experimental_run_flow_api_v1_run_advanced__flow_id_or_name__post'
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RunResponse'
          description: Successful Response
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
          description: Validation Error
      security:
      - API key query: []
      - API key header: []
      summary: Experimental Run Flow
      tags:
      - Base
  /api/v1/run/{flow_id_or_name}:
    post:
      description: 'Executes a specified flow by ID with support for streaming and telemetry (API key auth).<br><br>This endpoint executes a flow identified by ID or name, with options for streaming the response<br>and tracking execution metrics. It handles both streaming and non-streaming execution modes.<br>This endpoint uses API key authentication (Bearer token).<br><br>Args:<br>    background_tasks (BackgroundTasks): FastAPI background task manager<br>    flow (FlowRead | None): The flow to execute, loaded via dependency<br>    input_request (SimplifiedAPIRequest | None): Input parameters for the flow<br>    stream (bool): Whether to stream the response<br>    api_key_user (UserRead): Authenticated user from API key<br>    context (dict | None): Optional context to pass to the flow<br>    http_request (Request): The incoming HTTP request for extracting global variables<br><br>Returns:<br>    Union[StreamingResponse, RunResponse]: Either a streaming response for real-time results<br>    or a RunResponse with the complete execution results<br><br>Raises:<br>    HTTPException: For flow not found (404) or invalid input (400)<br>    APIException: For internal execution errors (500)<br><br>Notes:<br>    - Supports both streaming and non-streaming execution modes<br>    - Tracks execution time and success/failure via telemetry<br>    - Handles graceful client disconnection in streaming mode<br>    - Provides detailed error handling with appropriate HTTP status codes<br>    - Extracts global variables from HTTP headers with prefix X-LANGFLOW-GLOBAL-VAR-*<br>    - Merges extracted variables with the context parameter as "request_variables"<br>    - In streaming mode, uses EventManager to handle events:<br>        - "add_message": New messages during execution<br>        - "token": Individual tokens during streaming<br>        - "end": Final execution result<br>    - Authentication: Requires API key (Bearer token)'
      operationId: simplified_run_flow_api_v1_run__flow_id_or_name__post
      parameters:
      - in: path
        name: flow_id_or_name
        required: true
        schema:
          title: Flow Id Or Name
          type: string
      - in: query
        name: stream
        required: false
        schema:
          default: false
          title: Stream
          type: boolean
      - in: query
        name: user_id
        required: false
        schema:
          anyOf:
          - type: string
          - format: uuid
            type: string
          - type: 'null'
          title: User Id
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Body_simplified_run_flow_api_v1_run__flow_id_or_name__post'
      responses:
        '200':
          content:
            application/json:
              schema: {}
          description: Successful Response
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
          description: Validation Error
      security:
      - API key query: []
      - API key header: []
      summary: Simplified Run Flow
      tags:
      - Base
  /api/v1/version:
    get:
      operationId: get_version_api_v1_version_get
      responses:
        '200':
          content:
            application/json:
              schema: {}
          description: Successful Response
      summary: Get Version
      tags:
      - Base
  /api/v1/webhook/{flow_id_or_name}:
    post:
      description: 'Run a flow using a webhook request.<br><br>Args:<br>    flow_id_or_name: The flow ID or endpoint name (used by dependency).<br>    flow: The flow to be executed.<br>    request: The incoming HTTP request.<br><br>Returns:<br>    A dictionary containing the status of the task.<br><br>Raises:<br>    HTTPException: If the flow is not found or if there is an error processing the request.'
      operationId: webhook_run_flow_api_v1_webhook__flow_id_or_name__post
      parameters:
      - in: path
        name: flow_id_or_name
        required: true
        schema:
          title: Flow Id Or Name
          type: string
      - in: query
        name: user_id
        required: false
        schema:
          anyOf:
          - type: string
          - format: uuid
            type: string
          - type: 'null'
          title: User Id
      responses:
        '202':
          content:
            application/json:
              schema:
                additionalProperties: true
                title: Response Webhook Run Flow Api V1 Webhook  Flow Id Or Name  Post
                type: object
          description: Successful Response
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
          description: Validation Error
      summary: Webhook Run Flow
      tags:
      - Base
components:
  schemas:
    RunOutputs:
      properties:
        inputs:
          additionalProperties: true
          title: Inputs
          type: object
        outputs:
          items:
            anyOf:
            - $ref: '#/components/schemas/ResultData'
            - type: 'null'
          title: Outputs
          type: array
      title: RunOutputs
      type: object
    RunResponse:
      description: Run response schema.
      properties:
        outputs:
          anyOf:
          - items:
              $ref: '#/components/schemas/RunOutputs'
            type: array
          - type: 'null'
          default: []
          title: Outputs
        session_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Session Id
      title: RunResponse
      type: object
    Usage:
      description: Token usage information from LLM responses.
      properties:
        input_tokens:
          anyOf:
          - type: integer
          - type: 'null'
          title: Input Tokens
        output_tokens:
          anyOf:
          - type: integer
          - type: 'null'
          title: Output Tokens
        total_tokens:
          anyOf:
          - type: integer
          - type: 'null'
          title: Total Tokens
      title: Usage
      type: object
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          title: Detail
          type: array
      title: HTTPValidationError
      type: object
    PublicConfigResponse:
      description: 'Configuration response for public/unauthenticated endpoints like the public playground.


        Contains only the configuration values needed for public features, without sensitive data.

        The ''type'' field is a discriminator to distinguish from full ConfigResponse.'
      properties:
        allow_custom_components:
          title: Allow Custom Components
          type: boolean
        event_delivery:
          enum:
          - polling
          - streaming
          - direct
          title: Event Delivery
          type: string
        feature_flags:
          $ref: '#/components/schemas/FeatureFlags'
        frontend_timeout:
          title: Frontend Timeout
          type: integer
        max_file_size_upload:
          title: Max File Size Upload
          type: integer
        mcp_base_url:
          title: Mcp Base Url
          type: string
        type:
          const: public
          default: public
          title: Type
          type: string
        voice_mode_available:
          title: Voice Mode Available
          type: boolean
      required:
      - feature_flags
      - max_file_size_upload
      - event_delivery
      - voice_mode_available
      - frontend_timeout
      - mcp_base_url
      - allow_custom_components
      title: PublicConfigResponse
      type: object
    FeatureFlags:
      additionalProperties: false
      properties:
        mvp_components:
          default: false
          title: Mvp Components
          type: boolean
        wxo_deployments:
          default: false
          title: Wxo Deployments
          type: boolean
      title: FeatureFlags
      type: object
    ChatOutputResponse:
      description: Chat output response schema.
      properties:
        component_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Component Id
        files:
          default: []
          items:
            $ref: '#/components/schemas/lfx__utils__schemas__File'
          title: Files
          type: array
        message:
          anyOf:
          - type: string
          - items:
              anyOf:
              - type: string
              - additionalProperties: true
                type: object
            type: array
          title: Message
        sender:
          anyOf:
          - type: string
          - type: 'null'
          default: Machine
          title: Sender
        sender_name:
          anyOf:
          - type: string
          - type: 'null'
          default: AI
          title: Sender Name
        session_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Session Id
        stream_url:
          anyOf:
          - type: string
          - type: 'null'
          title: Stream Url
        type:
          title: Type
          type: string
      required:
      - message
      - type
      title: ChatOutputResponse
      type: object
    Tweaks:
      additionalProperties:
        anyOf:
        - type: string
        - additionalProperties: true
          type: object
      description: A dictionary of tweaks to adjust the flow's execution. Allows customizing flow behavior dynamically. All tweaks are overridden by the input values.
      examples:
      - Component Name:
          parameter_name: value
        component_id:
          parameter_name: value
        parameter_name: value
      title: Tweaks
      type: object
    ConfigResponse:
      description: 'Full configuration response for authenticated users.


        The ''type'' field is a discriminator to distinguish from PublicConfigResponse.'
      properties:
        allow_custom_components:
          title: Allow Custom Components
          type: boolean
        auto_saving:
          title: Auto Saving
          type: boolean
        auto_saving_interval:
          title: Auto Saving Interval
          type: integer
        default_folder_name:
          title: Default Folder Name
          type: string
        event_delivery:
          enum:
          - polling
          - streaming
          - direct
          title: Event Delivery
          type: string
        feature_flags:
          $ref: '#/components/schemas/FeatureFlags'
        frontend_timeout:
          title: Frontend Timeout
          type: integer
        health_check_max_retries:
          title: Health Check Max Retries
          type: integer
        hide_getting_started_progress:
          title: Hide Getting Started Progress
          type: boolean
        max_file_size_upload:
          title: Max File Size Upload
          type: integer
        mcp_base_url:
          title: Mcp Base Url
          type: string
        public_flow_cleanup_interval:
          title: Public Flow Cleanup Interval
          type: integer
        public_flow_expiration:
          title: Public Flow Expiration
          type: integer
        serialization_max_items_length:
          title: Serialization Max Items Length
          type: integer
        serialization_max_text_length:
          title: Serialization Max Text Length
          type: integer
        type:
          const: full
          default: full
          title: Type
          type: string
        voice_mode_available:
          title: Voice Mode Available
          type: boolean
        webhook_auth_enable:
          title: Webhook Auth Enable
          type: boolean
        webhook_polling_interval:
          title: Webhook Polling Interval
          type: integer
      required:
      - feature_flags
      - max_file_size_upload
      - event_delivery
      - voice_mode_available
      - frontend_timeout
      - mcp_base_url
      - serialization_max_items_length
      - serialization_max_text_length
      - auto_saving
      - auto_saving_interval
      - health_check_max_retries
      - webhook_polling_interval
      - public_flow_cleanup_interval
      - public_flow_expiration
      - webhook_auth_enable
      - default_folder_name
      - hide_getting_started_progress
      - allow_custom_components
      title: ConfigResponse
      type: object
    ValidationError:
      properties:
        ctx:
          title: Context
          type: object
        input:
          title: Input
        loc:
          items:
            anyOf:
            - type: string
            - type: integer
          title: Location
          type: array
        msg:
          title: Message
          type: string
        type:
          title: Error Type
          type: string
      required:
      - loc
      - msg
      - type
      title: ValidationError
      type: object
    SimplifiedAPIRequest:
      properties:
        input_type:
          anyOf:
          - enum:
            - chat
            - text
            - any
            type: string
          - type: 'null'
          default: chat
          description: The input type
          title: Input Type
        input_value:
          anyOf:
          - type: string
          - type: 'null'
          description: The input value
          title: Input Value
        output_component:
          anyOf:
          - type: string
          - type: 'null'
          default: ''
          description: If there are multiple output components, you can specify the component to get the output from.
          title: Output Component
        output_type:
          anyOf:
          - enum:
            - chat
            - text
            - any
            - debug
            type: string
          - type: 'null'
          default: chat
          description: The output type
          title: Output Type
        session_id:
          anyOf:
          - type: string
          - type: 'null'
          description: The session id
          title: Session Id
        tweaks:
          anyOf:
          - $ref: '#/components/schemas/Tweaks'
          - type: 'null'
          description: The tweaks
      title: SimplifiedAPIRequest
      type: object
    lfx__utils__schemas__File:
      description: File schema.
      properties:
        name:
          title: Name
          type: string
        path:
          title: Path
          type: string
        type:
          title: Type
          type: string
      required:
      - path
      - name
      - type
      title: File
      type: object
    InputValueRequest:
      additionalProperties: false
      examples:
      - components:
        - components_id
        - Component Name
        input_value: input_value
        session: session_id
      - components:
        - Component Name
        input_value: input_value
      - input_value: input_value
      - components:
        - Component Name
        input_value: input_value
        session: session_id
      - input_value: input_value
        session: session_id
      - input_value: input_value
        type: chat
      - input_value: '{"key": "value"}'
        type: json
      properties:
        client_request_time:
          anyOf:
          - type: integer
          - type: 'null'
          description: Client-side timestamp in milliseconds when the request was initiated. Used to calculate accurate end-to-end duration.
          title: Client Request Time
        components:
          anyOf:
          - items:
              type: string
            type: array
          - type: 'null'
          default: []
          title: Components
        input_value:
          anyOf:
          - type: string
          - type: 'null'
          title: Input Value
        session:
          anyOf:
          - type: string
          - type: 'null'
          title: Session
        type:
          anyOf:
          - enum:
            - chat
            - text
            - any
            type: string
          - type: 'null'
          default: any
          description: Defines on which components the input value should be applied. 'any' applies to all input components.
          title: Type
      title: InputValueRequest
      type: object
    Body_simplified_run_flow_api_v1_run__flow_id_or_name__post:
      properties:
        context:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          title: Context
        input_request:
          anyOf:
          - $ref: '#/components/schemas/SimplifiedAPIRequest'
          - type: 'null'
      title: Body_simplified_run_flow_api_v1_run__flow_id_or_name__post
      type: object
    Body_experimental_run_flow_api_v1_run_advanced__flow_id_or_name__post:
      properties:
        inputs:
          anyOf:
          - items:
              $ref: '#/components/schemas/InputValueRequest'
            type: array
          - type: 'null'
          title: Inputs
        outputs:
          anyOf:
          - items:
              type: string
            type: array
          - type: 'null'
          title: Outputs
        session_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Session Id
        stream:
          default: false
          title: Stream
          type: boolean
        tweaks:
          anyOf:
          - $ref: '#/components/schemas/Tweaks'
          - type: 'null'
      title: Body_experimental_run_flow_api_v1_run_advanced__flow_id_or_name__post
      type: object
    ResultData:
      properties:
        artifacts:
          anyOf:
          - {}
          - type: 'null'
          title: Artifacts
        component_display_name:
          anyOf:
          - type: string
          - type: 'null'
          title: Component Display Name
        component_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Component Id
        duration:
          anyOf:
          - type: string
          - type: 'null'
          title: Duration
        logs:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          title: Logs
        messages:
          anyOf:
          - items:
              $ref: '#/components/schemas/ChatOutputResponse'
            type: array
          - type: 'null'
          title: Messages
        outputs:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          title: Outputs
        results:
          anyOf:
          - {}
          - type: 'null'
          title: Results
        timedelta:
          anyOf:
          - type: number
          - type: 'null'
          title: Timedelta
        token_usage:
          anyOf:
          - $ref: '#/components/schemas/Usage'
          - type: 'null'
        used_frozen_result:
          anyOf:
          - type: boolean
          - type: 'null'
          default: false
          title: Used Frozen Result
      title: ResultData
      type: object
  securitySchemes:
    API key header:
      in: header
      name: x-api-key
      type: apiKey
    API key query:
      in: query
      name: x-api-key
      type: apiKey
    OAuth2PasswordBearerCookie:
      flows:
        password:
          scopes: {}
          tokenUrl: api/v1/login
      type: oauth2
Langflow Base API

Documentation

Specifications

Schemas & Data

Other Resources

OpenAPI Specification
