running-and-testing-locally

name	running-and-testing-locally
description	Use when running the Nango application locally for development and browser testing - covers Docker services, dev commands, service URLs, and troubleshooting startup issues

Running and Testing Nango Locally

Overview

Nango runs as a set of microservices (server, webapp, jobs, persist, orchestrator, metering, connect-ui) backed by Docker containers (PostgreSQL, Redis, Elasticsearch, ActiveMQ). Two terminal sessions are needed: one for TypeScript watch-build, one for running services.

Quick Reference

Command	Purpose	When to use
npm run dev:docker	Start Docker deps (DB, Redis, ES, ActiveMQ)	First step, once per session
npm run dev:watch (alias dw)	TypeScript watch-build	Terminal 1 — always running
npm run dev:watch:apps (alias dwa)	Run all services	Terminal 2 — full stack
npm run dev:watch:web	Run server + webapp + connect-ui only	Terminal 2 — frontend work
npm run dev:watch:headless (alias dwh)	Run backend services only (no UI)	Terminal 2 — backend work

Service URLs

Service	URL	Port
Webapp (dashboard)	http://localhost:3000	3000
API Server	http://localhost:3003	3003
Connect UI	http://localhost:3009	3009
PostgreSQL	localhost:5432	5432 (user: nango, pass: nango)
Redis	localhost:6379	6379
Elasticsearch	http://localhost:9500	9500
ActiveMQ Console	http://localhost:8161	8161

Step-by-Step Startup

# 1. Install dependencies (always after branch switch or pull)
npm install

# 2. Set up environment — check if .env exists first
#    If .env already exists, skip this step to avoid overwriting user customizations.
#    Only create it if missing.
if [ ! -f .env ]; then
  cp .env.example .env
  # Required: encryption key for persist service and Connect UI
  echo "NANGO_ENCRYPTION_KEY=$(openssl rand -base64 32)" >> .env
  # Required: enable auth (login/signup UI)
  echo "FLAG_AUTH_ENABLED=true" >> .env
  # Optional: enable RBAC
  echo "FLAG_AUTH_ROLES_ENABLED=true" >> .env
fi

# 3. Start Docker containers
npm run dev:docker

# 4. Terminal 1 — watch-build TypeScript
npm run dev:watch

# 5. Terminal 2 — run all services
npm run dev:watch:apps

If .env already exists but is missing required settings, ensure the following are set:

• NANGO_ENCRYPTION_KEY — required for persist service and Connect UI (openssl rand -base64 32 to generate)
• FLAG_AUTH_ENABLED=true — required for login/signup UI to appear
• FLAG_AUTH_ROLES_ENABLED=true — optional, enables RBAC

Wait for the TypeScript build to complete in Terminal 1 before starting services in Terminal 2. The server runs database migrations automatically on startup (NANGO_MIGRATE_AT_START defaults to true).

Selective Service Commands

Run individual services when you only need to restart one:

npm run server:dev:watch       # API server only (port 3003)
npm run webapp:dev:watch       # Webapp only (port 3000)
npm run connect-ui:dev:watch   # Connect UI only (port 3009)
npm run jobs:dev:watch         # Jobs worker (port 3005)
npm run persist:dev:watch      # Persist service (port 3007)
npm run orchestrator:dev:watch # Orchestrator (port 3008)
npm run metering:dev:watch     # Metering service (cron-based, no HTTP port)

Environment Configuration

The .env file at repo root configures local dev (copy from .env.example if it doesn't exist). Key settings:

SERVER_PORT=3003
NANGO_SERVER_URL=http://localhost:3003
NANGO_PUBLIC_SERVER_URL=http://localhost:3000
NANGO_PUBLIC_CONNECT_URL=http://localhost:3009
FLAG_AUTH_ENABLED=true              # Enables login/signup UI (default: false)
FLAG_AUTH_ROLES_ENABLED=true        # Enables RBAC (default: false)
FLAG_SERVE_CONNECT_UI=true          # Serve Connect UI (default: true)
NANGO_LOGS_ENABLED="false"         # Set "true" to enable ES logging
ORCHESTRATOR_SERVICE_URL="http://localhost:3008"
# NANGO_PUBSUB_TRANSPORT=activemq  # Uncomment to enable PubSub via ActiveMQ

NANGO_ENCRYPTION_KEY is required for the persist service and Connect UI to start (generate with openssl rand -base64 32 and add to .env).

Browser Testing Workflow

Capturing Server Logs for Verification URLs

When testing signup/email flows, the verification URL is logged to the server output. concurrently (used by dev:watch:apps) buffers child process output, so redirecting to a file doesn't reliably capture [srv] lines from a non-interactive shell. Two approaches:

Option A — Run the server separately with a Python PTY wrapper (autonomous): Run the server process directly with a pseudo-TTY to avoid buffering, while running other services normally. The --watch flag is required so the server auto-restarts when files change (without it, code changes require a manual restart):

# Server with PTY log capture
python3 -c "
import pty, os
pid, fd = pty.fork()
if pid == 0:
    os.chdir('packages/server')
    os.environ['DOTENV_CONFIG_PATH'] = './../../.env'
    os.execvp('npx', ['npx', 'tsx', '--watch', '-r', 'dotenv/config', 'lib/server.ts'])
else:
    with open('/tmp/nango-srv.log', 'wb') as f:
        while True:
            try:
                data = os.read(fd, 4096)
                if not data: break
                f.write(data); f.flush()
            except OSError: break
" &

# Other services (logs not needed)
npm run webapp:dev:watch > /dev/null 2>&1 &
npm run jobs:dev:watch > /dev/null 2>&1 &
npm run persist:dev:watch > /dev/null 2>&1 &
npm run orchestrator:dev:watch > /dev/null 2>&1 &
npm run metering:dev:watch > /dev/null 2>&1 &
npm run connect-ui:dev:watch > /dev/null 2>&1 &

Then grep: grep 'signup/verification' /tmp/nango-srv.log

Option B — Ask the user (simpler): The user starts npm run dev:watch:apps in their own terminal. After signup, ask the user to find the verification URL in their terminal output by searching for signup/verification.

Standard Test Credentials

Always use the same credentials for local dev:

• Name: Test User
• Email: [e-mail]
• Password: TestPassword123!

Authentication Flow

Check the DB first to decide whether to sign in or sign up:

docker exec nango-db psql -U nango -d nango -c "SELECT id, email, email_verified FROM _nango_users WHERE email='[e-mail]';"

• User exists + email_verified is true → sign in at http://localhost:3000/signin
• User exists + email_verified is false → need to verify email first (see Sign Up step 4+)
• No rows → proceed to Sign Up below

Sign Up (only if sign in fails)

1. Navigate to http://localhost:3000/signup
2. Fill in the signup form with the standard test credentials (Name, Email, Password). Password must contain: 8+ chars, uppercase, number, special character.
3. After submitting, the page shows a "Please verify your email" banner
4. In local dev, no email is actually sent. The server logs show the email content instead with (EmailClient) prefix:

   info (EmailClient) Email client not configured
   info (EmailClient) The following email would have been sent:
   info (EmailClient) [e-mail] 'Verify your email address'
   <a href="http://localhost:3000/signup/verification/<uuid>">...</a>
   

5. Find the verification URL in the captured logs:

   grep 'signup/verification' /tmp/nango-srv.log
   

6. Open the verification URL (format: http://localhost:3000/signup/verification/<uuid>) in the browser
7. After verification, the app redirects to an onboarding survey ("How did you hear about Nango?") — click any option or "Skip for now" to proceed
8. You land on the Getting Started page / dashboard with sidebar navigation (Integrations, Connections, Logs, Metrics, Environment settings)

General Notes

• With FLAG_AUTH_ENABLED=true, you'll see the login/signup page
• On a fresh/empty database, you must sign up first to create the initial account
• For SSO/OAuth testing, ensure WORKOS_API_KEY and WORKOS_CLIENT_ID are configured in .env

Testing Connect UI

1. Ensure NANGO_ENCRYPTION_KEY is set in .env
2. Open http://localhost:3009 directly, or trigger it from the dashboard
3. Connect UI is served by its own Vite dev server with hot reload

Docker Container Management

# Start containers (detached)
npm run dev:docker

# Check container status
docker compose --file dev/docker-compose.dev.yaml ps

# View logs for a specific container
docker compose --file dev/docker-compose.dev.yaml logs -f nango-db

# Stop all containers
docker compose --file dev/docker-compose.dev.yaml down

# Remove named volumes (Elasticsearch, etc.) — does NOT reset the DB (bind mount)
docker compose --file dev/docker-compose.dev.yaml down -v
npm run dev:docker
# To reset the database, see "Fresh Database Reset" below

Fresh Database Reset

⚠ Always ask the user for confirmation before resetting the database. This is a destructive operation that deletes all data (users, connections, integrations, etc.).

Important: The PostgreSQL container uses a bind mount (dev/nango-data), not a named Docker volume. docker compose down -v does NOT reset the database — it only removes named volumes like Elasticsearch data.

To start fresh:

1. Stop all running services (kill dev:watch:apps or individual service processes)
2. Drop all schemas in the database:

   docker exec nango-db psql -U nango -d nango -c "
     DROP SCHEMA public CASCADE;
     CREATE SCHEMA public;
     DROP SCHEMA IF EXISTS nango CASCADE;
     DROP SCHEMA IF EXISTS nango_records CASCADE;
     DROP SCHEMA IF EXISTS nango_runners CASCADE;
   "
   

3. Restart services — the server runs migrations automatically on startup, recreating all tables
4. You will need to sign up again (no users exist after reset)

Product Flows

Step-by-step instructions for testing specific product features in the browser. Teammates: please add new flows here as you discover/test them — follow the template below.

No flows documented yet — add the first one!

Common Issues

Issue	Symptom	Fix
Docker not running	Cannot connect to the Docker daemon	Start Docker Desktop
Port already in use	EADDRINUSE on startup	Kill the process on that port: lsof -ti:PORT | xargs kill
DB connection refused	Server crashes on startup	Check npm run dev:docker — wait for postgres to be ready
Stale TypeScript build	Runtime errors, missing modules	Stop dev:watch, run npm run ts-clean && npm run ts-build, restart
Webapp not loading	Blank page or 404	Ensure dev:watch has finished initial build before starting dev:watch:apps
Missing node_modules	Cannot find module errors	Run npm install — required after branch switch
Persist crashes on startup	NANGO_ENCRYPTION_KEY invalid_type error	Set NANGO_ENCRYPTION_KEY in .env (openssl rand -base64 32)
Connect UI not working	500 errors or session failures	Set NANGO_ENCRYPTION_KEY in .env
Can't log in on fresh DB	No account exists yet	Sign up first at http://localhost:3000/signup, then check server logs for the verification callback URL
Elasticsearch errors in logs	Logs-related warnings	Safe to ignore if NANGO_LOGS_ENABLED="false" — logs go to stdout instead