Langflow

Langflow Workflow API

The Workflow API from Langflow — 2 operation(s) for workflow.

GitHub OpenAPI

Documentation

📖
Documentation
https://docs.langflow.org/api-reference-api-examples
📖
Authentication
https://docs.langflow.org/api-keys-and-authentication
📖
Documentation
https://docs.langflow.org/concepts-flows
📖
Documentation
https://docs.langflow.org/mcp-server
📖
Documentation
https://docs.langflow.org/api-keys-and-authentication

Specifications

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

Schemas & Data

📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/langflow/refs/heads/main/json-schema/langflow-flow-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/langflow/refs/heads/main/json-schema/langflow-project-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/langflow/refs/heads/main/json-schema/langflow-message-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/langflow/refs/heads/main/json-schema/langflow-user-schema.json
📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/langflow/refs/heads/main/json-schema/langflow-mcp-server-schema.json

Other Resources

🔗
JSONLD
https://raw.githubusercontent.com/api-evangelist/langflow/refs/heads/main/json-ld/langflow-context.jsonld
🔗
Vocabulary
https://raw.githubusercontent.com/api-evangelist/langflow/refs/heads/main/vocabulary/langflow-vocabulary.yml
🔗
SpectralRuleset
https://raw.githubusercontent.com/api-evangelist/langflow/refs/heads/main/rules/langflow-rules.yml

OpenAPI Specification

langflow-workflow-api-openapi.yml Raw ↑ 
openapi: 3.1.0
info:
  title: Langflow Base Workflow API
  version: 1.9.0
tags:
- name: Workflow
paths:
  /api/v2/workflows:
    get:
      description: Get status of workflow job by job ID
      operationId: get_workflow_status_api_v2_workflows_get
      parameters:
      - description: Job ID to query
        in: query
        name: job_id
        required: false
        schema:
          anyOf:
          - type: string
          - format: uuid
            type: string
          - type: 'null'
          description: Job ID to query
          title: Job Id
      responses:
        '200':
          content:
            application/json:
              schema:
                description: Synchronous workflow execution response.
                properties:
                  created_timestamp:
                    title: Created Timestamp
                    type: string
                  errors:
                    default: []
                    items:
                      $ref: '#/components/schemas/ErrorDetail'
                    title: Errors
                    type: array
                  flow_id:
                    title: Flow Id
                    type: string
                  inputs:
                    additionalProperties: true
                    default: {}
                    title: Inputs
                    type: object
                  job_id:
                    anyOf:
                    - type: string
                    - format: uuid
                      type: string
                    - type: 'null'
                    title: Job Id
                  object:
                    const: response
                    default: response
                    title: Object
                    type: string
                  outputs:
                    additionalProperties:
                      $ref: '#/components/schemas/ComponentOutput'
                    default: {}
                    title: Outputs
                    type: object
                  status:
                    $ref: '#/components/schemas/JobStatus'
                required:
                - flow_id
                - status
                title: WorkflowExecutionResponse
                type: object
            text/event-stream:
              description: Server-sent events for streaming status
              schema:
                description: Streaming event response.
                properties:
                  raw_event:
                    additionalProperties: true
                    title: Raw Event
                    type: object
                  run_id:
                    title: Run Id
                    type: string
                  timestamp:
                    title: Timestamp
                    type: integer
                  type:
                    title: Type
                    type: string
                required:
                - type
                - run_id
                - timestamp
                - raw_event
                title: WorkflowStreamEvent
                type: object
          description: Workflow status response
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
          description: Validation Error
      security:
      - API key query: []
      - API key header: []
      summary: Get Workflow Status
      tags:
      - Workflow
    post:
      description: Execute a workflow with support for sync, stream, and background modes
      operationId: execute_workflow_api_v2_workflows_post
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/WorkflowExecutionRequest'
        required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                discriminator:
                  mapping:
                    job: '#/components/schemas/WorkflowJobResponse'
                    response: '#/components/schemas/WorkflowExecutionResponse'
                  propertyName: object
                oneOf:
                - description: Synchronous workflow execution response.
                  properties:
                    created_timestamp:
                      title: Created Timestamp
                      type: string
                    errors:
                      default: []
                      items:
                        $ref: '#/components/schemas/ErrorDetail'
                      title: Errors
                      type: array
                    flow_id:
                      title: Flow Id
                      type: string
                    inputs:
                      additionalProperties: true
                      default: {}
                      title: Inputs
                      type: object
                    job_id:
                      anyOf:
                      - type: string
                      - format: uuid
                        type: string
                      - type: 'null'
                      title: Job Id
                    object:
                      const: response
                      default: response
                      title: Object
                      type: string
                    outputs:
                      additionalProperties:
                        $ref: '#/components/schemas/ComponentOutput'
                      default: {}
                      title: Outputs
                      type: object
                    status:
                      $ref: '#/components/schemas/JobStatus'
                  required:
                  - flow_id
                  - status
                  title: WorkflowExecutionResponse
                  type: object
                - description: Background job response.
                  properties:
                    created_timestamp:
                      title: Created Timestamp
                      type: string
                    errors:
                      default: []
                      items:
                        $ref: '#/components/schemas/ErrorDetail'
                      title: Errors
                      type: array
                    flow_id:
                      title: Flow Id
                      type: string
                    job_id:
                      anyOf:
                      - type: string
                      - format: uuid
                        type: string
                      title: Job Id
                    links:
                      additionalProperties:
                        type: string
                      title: Links
                      type: object
                    object:
                      const: job
                      default: job
                      title: Object
                      type: string
                    status:
                      $ref: '#/components/schemas/JobStatus'
                  required:
                  - job_id
                  - flow_id
                  - status
                  title: WorkflowJobResponse
                  type: object
            text/event-stream:
              description: Server-sent events for streaming execution
              schema:
                description: Streaming event response.
                properties:
                  raw_event:
                    additionalProperties: true
                    title: Raw Event
                    type: object
                  run_id:
                    title: Run Id
                    type: string
                  timestamp:
                    title: Timestamp
                    type: integer
                  type:
                    title: Type
                    type: string
                required:
                - type
                - run_id
                - timestamp
                - raw_event
                title: WorkflowStreamEvent
                type: object
          description: Workflow execution response
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
          description: Validation Error
      security:
      - API key query: []
      - API key header: []
      summary: Execute Workflow
      tags:
      - Workflow
  /api/v2/workflows/stop:
    post:
      description: Stop a running workflow execution
      operationId: stop_workflow_api_v2_workflows_stop_post
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/WorkflowStopRequest'
        required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/WorkflowStopResponse'
          description: Successful Response
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
          description: Validation Error
      security:
      - API key query: []
      - API key header: []
      summary: Stop Workflow
      tags:
      - Workflow
components:
  schemas:
    ComponentOutput:
      description: Component output schema.
      properties:
        content:
          anyOf:
          - {}
          - type: 'null'
          title: Content
        metadata:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          title: Metadata
        status:
          $ref: '#/$defs/JobStatus'
        type:
          description: Type of the component output (e.g., 'message', 'data', 'tool', 'text')
          title: Type
          type: string
      required:
      - type
      - status
      title: ComponentOutput
      type: object
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          title: Detail
          type: array
      title: HTTPValidationError
      type: object
    ErrorDetail:
      description: Error detail schema.
      properties:
        code:
          anyOf:
          - type: string
          - type: 'null'
          title: Code
        details:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          title: Details
        error:
          title: Error
          type: string
      required:
      - error
      title: ErrorDetail
      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
    WorkflowExecutionRequest:
      additionalProperties: false
      description: Request schema for workflow execution.
      examples:
      - background: false
        flow_id: flow_67ccd2be17f0819081ff3bb2cf6508e60bb6a6b452d3795b
        inputs:
          ChatInput-abc.input_value: Hello, how can you help me today?
          ChatInput-abc.session_id: session-123
          LLM-xyz.max_tokens: 100
          LLM-xyz.temperature: 0.7
          OpenSearch-def.opensearch_url: https://opensearch:9200
        stream: false
      - background: true
        flow_id: flow_67ccd2be17f0819081ff3bb2cf6508e60bb6a6b452d3795b
        inputs:
          ChatInput-abc.input_value: Process this in the background
        stream: false
      - background: false
        flow_id: flow_67ccd2be17f0819081ff3bb2cf6508e60bb6a6b452d3795b
        inputs:
          ChatInput-abc.input_value: Stream this conversation
        stream: true
      properties:
        background:
          default: false
          title: Background
          type: boolean
        flow_id:
          title: Flow Id
          type: string
        inputs:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          description: 'Component-specific inputs in flat format: ''component_id.param_name'': value'
          title: Inputs
        stream:
          default: false
          title: Stream
          type: boolean
      required:
      - flow_id
      title: WorkflowExecutionRequest
      type: object
    WorkflowStopRequest:
      description: Request schema for stopping workflow.
      properties:
        job_id:
          anyOf:
          - type: string
          - format: uuid
            type: string
          title: Job Id
      required:
      - job_id
      title: WorkflowStopRequest
      type: object
    JobStatus:
      description: Job execution status.
      enum:
      - queued
      - in_progress
      - completed
      - failed
      - cancelled
      - timed_out
      title: JobStatus
      type: string
    WorkflowStopResponse:
      description: Response schema for stopping workflow.
      properties:
        job_id:
          anyOf:
          - type: string
          - format: uuid
            type: string
          title: Job Id
        message:
          anyOf:
          - type: string
          - type: 'null'
          title: Message
      required:
      - job_id
      title: WorkflowStopResponse
      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