API Quick Start

API Quick Start

Overview

Local Deep Research provides both HTTP REST API and programmatic Python API access. Since version 1.0, authentication is required for all API endpoints, and the system uses per-user encrypted databases.

Simplest Usage - Python Client

The easiest way to use the API is with the built-in client that handles all authentication complexity:

from local_deep_research.api import LDRClient, quick_query

# One-liner for quick research
summary = quick_query("username", "password", "What is DNA?")
print(summary)

# Or use the client for multiple operations
client = LDRClient()
client.login("username", "password")
result = client.quick_research("What is machine learning?")
print(result["summary"])

No need to worry about CSRF tokens, HTML parsing, or session management!

Authentication

Web UI Authentication

The API requires authentication through the web interface first:

1. Start the server:

   python -m local_deep_research.web.app
   

2. Open http://localhost:5000 in your browser

3. Register a new account or login

4. Your session cookie will be used for API authentication

HTTP API Authentication

For HTTP API requests, you need to:

1. First authenticate through the login endpoint
2. Include the session cookie in subsequent requests
3. Include CSRF token for state-changing operations

Example authentication flow:

import requests
from bs4 import BeautifulSoup

# Create a session to persist cookies
session = requests.Session()

# 1. Get login page and extract CSRF token for login
login_page = session.get("http://localhost:5000/auth/login")
soup = BeautifulSoup(login_page.text, 'html.parser')
csrf_input = soup.find('input', {'name': 'csrf_token'})
login_csrf = csrf_input.get('value') if csrf_input else None

# 2. Login with form data (not JSON) including CSRF
login_response = session.post(
    "http://localhost:5000/auth/login",
    data={
        "username": "your_username",
        "password": "your_password",
        "csrf_token": login_csrf
    }
)

if login_response.status_code in [200, 302]:
    print("Login successful")
    # Session cookie is automatically stored
else:
    print(f"Login failed: {login_response.text}")

# 3. Get CSRF token for API requests
csrf_response = session.get("http://localhost:5000/auth/csrf-token")
csrf_token = csrf_response.json()["csrf_token"]

# 4. Make API requests with CSRF header
headers = {"X-CSRF-Token": csrf_token}
api_response = session.post(
    "http://localhost:5000/api/start_research",
    json={
        "query": "What is quantum computing?",
        "model": "gpt-3.5-turbo",
        "search_engines": ["searxng"],
    },
    headers=headers
)

Programmatic API Access

The programmatic API now requires a settings snapshot for proper context:

from local_deep_research.api import quick_summary
from local_deep_research.settings import CachedSettingsManager
from local_deep_research.database.session_context import get_user_db_session

# Get user session and settings
with get_user_db_session(username="your_username", password="your_password") as session:
    settings_manager = CachedSettingsManager(session, "your_username")
    settings_snapshot = settings_manager.get_all_settings()

    # Use the API with settings snapshot
    result = quick_summary(
        query="What is machine learning?",
        settings_snapshot=settings_snapshot,
        iterations=2,
        questions_per_iteration=3
    )

    print(result["summary"])

API Endpoints

Research Endpoints

Research endpoints are under /api/:

• POST /api/start_research - Start new research
• GET /api/research/{id}/status - Check research status
• GET /api/report/{id} - Get research results
• POST /api/terminate/{id} - Stop running research

Settings Endpoints

Settings endpoints are under /settings/api/:

• GET /settings/api - Get all settings
• GET /settings/api/{key} - Get specific setting
• PUT /settings/api/{key} - Update setting
• GET /settings/api/available-models - Get available LLM providers
• GET /settings/api/available-search-engines - Get search engines

History Endpoints

• GET /history/api - Get research history
• GET /history/api/{id} - Get specific research details

Important Changes from v1.x

1. Authentication Required: All API endpoints now require authentication
2. Settings Snapshot: Programmatic API calls need settings_snapshot parameter
3. Per-User Databases: Each user has their own encrypted database
4. CSRF Protection: State-changing requests require CSRF token
5. New Endpoint Structure: Research APIs are under /api/ (e.g., /api/start_research)

Example: Complete Research Flow

import requests
import time

# Setup session and login
session = requests.Session()
session.post(
    "http://localhost:5000/auth/login",
    json={"username": "user", "password": "pass"}
)

# Get CSRF token
csrf = session.get("http://localhost:5000/auth/csrf-token").json()["csrf_token"]
headers = {"X-CSRF-Token": csrf}

# Start research
research = session.post(
    "http://localhost:5000/api/start_research",
    json={
        "query": "Latest advances in quantum computing",
        "model": "gpt-3.5-turbo",
        "search_engines": ["arxiv", "wikipedia"],
        "iterations": 3
    },
    headers=headers
).json()

research_id = research["research_id"]

# Poll for results
while True:
    status = session.get(
        f"http://localhost:5000/api/research/{research_id}/status"
    ).json()

    if status["status"] in ["completed", "failed"]:
        break

    print(f"Progress: {status.get('progress', 'unknown')}")
    time.sleep(5)

# Get final results
results = session.get(
    f"http://localhost:5000/api/report/{research_id}"
).json()

print(f"Summary: {results['summary']}")
print(f"Sources: {len(results['sources'])}")

Rate Limiting

The API includes adaptive rate limiting:

• Default: 60 requests per minute per user
• Automatic retry with exponential backoff
• Rate limits are per-user, not per-IP

Error Handling

Common error responses:

• 401: Not authenticated - login required
• 403: CSRF token missing or invalid
• 404: Resource not found
• 429: Rate limit exceeded
• 500: Server error

Always check response status and handle errors appropriately.

Next Steps

• See examples/api_usage for complete examples
• Check docs/CUSTOM_LLM_INTEGRATION.md for custom LLM setup
• Read docs/LANGCHAIN_RETRIEVER_INTEGRATION.md for custom retrievers