API Reference

Conductor exposes a full REST API for managing workflow definitions, executions, tasks, and events.

Base URL

All API endpoints are relative to your Conductor server's base URL:

http://localhost:8080/api/

For example, to list all workflow definitions:

curl http://localhost:8080/api/metadata/workflow

If your Conductor server runs on a different host or port, replace localhost:8080 accordingly.

Authentication

Conductor OSS does not require authentication by default. All API endpoints are open. If you need to secure your Conductor instance, you can add authentication via a reverse proxy (e.g., Nginx, Envoy) or by implementing a custom security filter in Spring Boot.

Content Type

All request and response bodies use JSON. Set the following headers on requests with a body:

Content-Type: application/json

A few endpoints return plain text (e.g., workflow ID on start). These are noted in their documentation.

Common Response Codes

Status Code	Description
200 OK	Request succeeded. Response body contains the result.
204 No Content	Request succeeded but there is no response body (e.g., poll with no tasks available).
400 Bad Request	Invalid request — check your request body or parameters.
404 Not Found	The requested resource (workflow, task, definition) does not exist.
409 Conflict	Conflict with current state (e.g., trying to resume a workflow that is not paused).
500 Internal Server Error	Server-side error. Check Conductor server logs.

Error Response Format

When an error occurs, the response body contains:

{
  "status": 400,
  "message": "Workflow definition is not valid",
  "instance": "conductor-server",
  "retryable": false
}

Quick Start

Register a workflow definition, start it, and check its status — all in three commands:

# 1. Register a workflow definition
curl -X POST 'http://localhost:8080/api/metadata/workflow' \
  -H 'Content-Type: application/json' \
  -d '{
    "name": "hello_workflow",
    "version": 1,
    "tasks": [
      {
        "name": "hello_task",
        "taskReferenceName": "hello_ref",
        "type": "HTTP",
        "inputParameters": {
          "uri": "https://jsonplaceholder.typicode.com/posts/1",
          "method": "GET"
        }
      }
    ],
    "schemaVersion": 2
  }'

# 2. Start a workflow execution
WORKFLOW_ID=$(curl -s -X POST 'http://localhost:8080/api/workflow/hello_workflow' \
  -H 'Content-Type: application/json' \
  -d '{}')
echo "Started workflow: $WORKFLOW_ID"

# 3. Check workflow status
curl "http://localhost:8080/api/workflow/$WORKFLOW_ID"

API Sections

Section	Base Path	Description
Metadata	/api/metadata	Register, update, validate, and delete workflow and task definitions
Start Workflow	/api/workflow	Start workflows asynchronously, synchronously, or with dynamic definitions
Workflow	/api/workflow	Manage executions: get status, pause, resume, retry, restart, terminate, search
Task	/api/tasks	Poll for tasks, update results, manage queues, view logs, search
Bulk Operations	/api/workflow/bulk	Pause, resume, restart, retry, terminate, or remove workflows in batch
Event Handlers	/api/event	Create and manage event-driven workflow triggers
Task Domains	—	Route tasks to specific worker pools at runtime

Swagger UI

The Swagger UI at http://localhost:8080/swagger-ui/index.html provides an interactive API explorer where you can try endpoints directly from your browser.

SDKs

For programmatic access, use one of the official Conductor SDKs which wrap these REST APIs with language-native interfaces for Java, Python, Go, JavaScript, C#, Ruby, and Rust.