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mcphub/docs/configuration/environment-variables.mdx
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---
title: 'Environment Variables'
description: 'Configure MCPHub using environment variables'
---
# Environment Variables
MCPHub uses environment variables for configuration. This guide covers all available variables and their usage.
## Core Application Settings
### Server Configuration
| Variable | Default | Description |
| ----------- | ------------- | ------------------------------------------------------------- |
| `PORT` | `3000` | Port number for the HTTP server |
| `HOST` | `0.0.0.0` | Host address to bind the server |
| `NODE_ENV` | `development` | Application environment (`development`, `production`, `test`) |
| `LOG_LEVEL` | `info` | Logging level (`error`, `warn`, `info`, `debug`) |
```env
PORT=3000
HOST=0.0.0.0
NODE_ENV=production
LOG_LEVEL=info
```
### Database Configuration
| Variable | Default | Description |
| -------------- | ----------- | ---------------------------------- |
| `DATABASE_URL` | - | PostgreSQL connection string |
| `DB_HOST` | `localhost` | Database host |
| `DB_PORT` | `5432` | Database port |
| `DB_NAME` | `mcphub` | Database name |
| `DB_USER` | `mcphub` | Database username |
| `DB_PASSWORD` | - | Database password |
| `DB_SSL` | `false` | Enable SSL for database connection |
| `DB_POOL_MIN` | `2` | Minimum database pool size |
| `DB_POOL_MAX` | `10` | Maximum database pool size |
```env
# Option 1: Full connection string
DATABASE_URL=postgresql://username:password@localhost:5432/mcphub
# Option 2: Individual components
DB_HOST=localhost
DB_PORT=5432
DB_NAME=mcphub
DB_USER=mcphub
DB_PASSWORD=your-password
DB_SSL=false
```
## Authentication & Security
### JWT Configuration
| Variable | Default | Description |
| ------------------------ | ------- | ------------------------------------------- |
| `JWT_SECRET` | - | Secret key for JWT token signing (required) |
| `JWT_EXPIRES_IN` | `24h` | JWT token expiration time |
| `JWT_REFRESH_EXPIRES_IN` | `7d` | Refresh token expiration time |
| `JWT_ALGORITHM` | `HS256` | JWT signing algorithm |
```env
JWT_SECRET=your-super-secret-key-change-this-in-production
JWT_EXPIRES_IN=24h
JWT_REFRESH_EXPIRES_IN=7d
```
### Session & Security
| Variable | Default | Description |
| ------------------- | ------- | ------------------------------- |
| `SESSION_SECRET` | - | Session encryption secret |
| `BCRYPT_ROUNDS` | `12` | bcrypt hashing rounds |
| `RATE_LIMIT_WINDOW` | `15` | Rate limiting window in minutes |
| `RATE_LIMIT_MAX` | `100` | Maximum requests per window |
| `CORS_ORIGIN` | `*` | Allowed CORS origins |
```env
SESSION_SECRET=your-session-secret
BCRYPT_ROUNDS=12
RATE_LIMIT_WINDOW=15
RATE_LIMIT_MAX=100
CORS_ORIGIN=https://your-domain.com,https://admin.your-domain.com
```
## External Services
### OpenAI Configuration
| Variable | Default | Description |
| ------------------------ | ------------------------ | -------------------------------- |
| `OPENAI_API_KEY` | - | OpenAI API key for smart routing |
| `OPENAI_MODEL` | `gpt-3.5-turbo` | OpenAI model for embeddings |
| `OPENAI_EMBEDDING_MODEL` | `text-embedding-ada-002` | Model for vector embeddings |
| `OPENAI_MAX_TOKENS` | `1000` | Maximum tokens per request |
| `OPENAI_TEMPERATURE` | `0.1` | Temperature for AI responses |
```env
OPENAI_API_KEY=sk-your-openai-api-key
OPENAI_MODEL=gpt-3.5-turbo
OPENAI_EMBEDDING_MODEL=text-embedding-ada-002
OPENAI_MAX_TOKENS=1000
OPENAI_TEMPERATURE=0.1
```
### Redis Configuration (Optional)
| Variable | Default | Description |
| ---------------- | ----------- | ----------------------- |
| `REDIS_URL` | - | Redis connection string |
| `REDIS_HOST` | `localhost` | Redis host |
| `REDIS_PORT` | `6379` | Redis port |
| `REDIS_PASSWORD` | - | Redis password |
| `REDIS_DB` | `0` | Redis database number |
| `REDIS_PREFIX` | `mcphub:` | Key prefix for Redis |
```env
# Option 1: Full connection string
REDIS_URL=redis://username:password@localhost:6379/0
# Option 2: Individual components
REDIS_HOST=localhost
REDIS_PORT=6379
REDIS_PASSWORD=your-redis-password
REDIS_DB=0
REDIS_PREFIX=mcphub:
```
## MCP Server Configuration
### Default Settings
| Variable | Default | Description |
| ------------------- | ------------------- | -------------------------------------------- |
| `MCP_SETTINGS_FILE` | `mcp_settings.json` | Path to MCP settings file |
| `MCP_SERVERS_FILE` | `servers.json` | Path to servers configuration |
| `MCP_TIMEOUT` | `30000` | Default timeout for MCP operations (ms) |
| `MCP_MAX_RETRIES` | `3` | Maximum retry attempts for failed operations |
| `MCP_RESTART_DELAY` | `5000` | Delay before restarting failed servers (ms) |
```env
MCP_SETTINGS_FILE=./config/mcp_settings.json
MCP_SERVERS_FILE=./config/servers.json
MCP_TIMEOUT=30000
MCP_MAX_RETRIES=3
MCP_RESTART_DELAY=5000
```
### Smart Routing
| Variable | Default | Description |
| --------------------------- | ------- | -------------------------------- |
| `SMART_ROUTING_ENABLED` | `true` | Enable AI-powered smart routing |
| `SMART_ROUTING_THRESHOLD` | `0.7` | Similarity threshold for routing |
| `SMART_ROUTING_MAX_RESULTS` | `5` | Maximum tools to return |
| `VECTOR_CACHE_TTL` | `3600` | Vector cache TTL in seconds |
```env
SMART_ROUTING_ENABLED=true
SMART_ROUTING_THRESHOLD=0.7
SMART_ROUTING_MAX_RESULTS=5
VECTOR_CACHE_TTL=3600
```
## File Storage & Uploads
| Variable | Default | Description |
| -------------------- | ---------------- | ----------------------------------- |
| `UPLOAD_DIR` | `./uploads` | Directory for file uploads |
| `MAX_FILE_SIZE` | `10485760` | Maximum file size in bytes (10MB) |
| `ALLOWED_FILE_TYPES` | `image/*,text/*` | Allowed MIME types |
| `STORAGE_TYPE` | `local` | Storage type (`local`, `s3`, `gcs`) |
```env
UPLOAD_DIR=./data/uploads
MAX_FILE_SIZE=10485760
ALLOWED_FILE_TYPES=image/*,text/*,application/json
STORAGE_TYPE=local
```
### S3 Storage (Optional)
| Variable | Default | Description |
| ---------------------- | ----------- | ------------------ |
| `S3_BUCKET` | - | S3 bucket name |
| `S3_REGION` | `us-east-1` | S3 region |
| `S3_ACCESS_KEY_ID` | - | S3 access key |
| `S3_SECRET_ACCESS_KEY` | - | S3 secret key |
| `S3_ENDPOINT` | - | Custom S3 endpoint |
```env
S3_BUCKET=mcphub-uploads
S3_REGION=us-east-1
S3_ACCESS_KEY_ID=your-access-key
S3_SECRET_ACCESS_KEY=your-secret-key
```
## Monitoring & Logging
### Application Monitoring
| Variable | Default | Description |
| ------------------------ | ------- | ----------------------------- |
| `METRICS_ENABLED` | `true` | Enable metrics collection |
| `METRICS_PORT` | `9090` | Port for metrics endpoint |
| `HEALTH_CHECK_INTERVAL` | `30000` | Health check interval (ms) |
| `PERFORMANCE_MONITORING` | `false` | Enable performance monitoring |
```env
METRICS_ENABLED=true
METRICS_PORT=9090
HEALTH_CHECK_INTERVAL=30000
PERFORMANCE_MONITORING=true
```
### Logging Configuration
| Variable | Default | Description |
| ------------------ | ------------ | --------------------------------------- |
| `LOG_FORMAT` | `json` | Log format (`json`, `text`) |
| `LOG_FILE` | - | Log file path (if file logging enabled) |
| `LOG_MAX_SIZE` | `10m` | Maximum log file size |
| `LOG_MAX_FILES` | `5` | Maximum number of log files |
| `LOG_DATE_PATTERN` | `YYYY-MM-DD` | Date pattern for log rotation |
```env
LOG_FORMAT=json
LOG_FILE=./logs/mcphub.log
LOG_MAX_SIZE=10m
LOG_MAX_FILES=5
LOG_DATE_PATTERN=YYYY-MM-DD
```
## Development & Debug
| Variable | Default | Description |
| ------------------------ | ------- | ----------------------------------- |
| `DEBUG` | - | Debug namespaces (e.g., `mcphub:*`) |
| `DEV_TOOLS_ENABLED` | `false` | Enable development tools |
| `HOT_RELOAD` | `true` | Enable hot reload in development |
| `MOCK_EXTERNAL_SERVICES` | `false` | Mock external API calls |
```env
DEBUG=mcphub:*
DEV_TOOLS_ENABLED=true
HOT_RELOAD=true
MOCK_EXTERNAL_SERVICES=false
```
## Production Optimization
| Variable | Default | Description |
| ------------------ | ------- | -------------------------------------- |
| `CLUSTER_MODE` | `false` | Enable cluster mode |
| `WORKER_PROCESSES` | `0` | Number of worker processes (0 = auto) |
| `MEMORY_LIMIT` | - | Memory limit per process |
| `CPU_LIMIT` | - | CPU limit per process |
| `GC_OPTIMIZE` | `false` | Enable garbage collection optimization |
```env
CLUSTER_MODE=true
WORKER_PROCESSES=4
MEMORY_LIMIT=512M
GC_OPTIMIZE=true
```
## Configuration Examples
### Development Environment
```env
# .env.development
NODE_ENV=development
PORT=3000
LOG_LEVEL=debug
# Database
DATABASE_URL=postgresql://mcphub:password@localhost:5432/mcphub_dev
# Auth
JWT_SECRET=dev-secret-key
JWT_EXPIRES_IN=24h
# OpenAI (optional for development)
# OPENAI_API_KEY=your-dev-key
# Debug
DEBUG=mcphub:*
DEV_TOOLS_ENABLED=true
HOT_RELOAD=true
```
### Production Environment
```env
# .env.production
NODE_ENV=production
PORT=3000
LOG_LEVEL=info
LOG_FORMAT=json
# Database
DATABASE_URL=postgresql://mcphub:secure-password@db.example.com:5432/mcphub
DB_SSL=true
DB_POOL_MAX=20
# Security
JWT_SECRET=your-super-secure-production-secret
SESSION_SECRET=your-session-secret
BCRYPT_ROUNDS=14
# External Services
OPENAI_API_KEY=your-production-openai-key
REDIS_URL=redis://redis.example.com:6379
# Monitoring
METRICS_ENABLED=true
PERFORMANCE_MONITORING=true
# Optimization
CLUSTER_MODE=true
GC_OPTIMIZE=true
```
### Docker Environment
```env
# .env.docker
NODE_ENV=production
HOST=0.0.0.0
PORT=3000
# Use service names for Docker networking
DATABASE_URL=postgresql://mcphub:password@postgres:5432/mcphub
REDIS_URL=redis://redis:6379
# Security
JWT_SECRET_FILE=/run/secrets/jwt_secret
DB_PASSWORD_FILE=/run/secrets/db_password
# File paths in container
MCP_SETTINGS_FILE=/app/mcp_settings.json
UPLOAD_DIR=/app/data/uploads
LOG_FILE=/app/logs/mcphub.log
```
## Environment Variable Loading
MCPHub loads environment variables in the following order:
1. System environment variables
2. `.env.local` (ignored by git)
3. `.env.{NODE_ENV}` (e.g., `.env.production`)
4. `.env`
### Using dotenv-expand
MCPHub supports variable expansion:
```env
BASE_URL=https://api.example.com
API_ENDPOINT=${BASE_URL}/v1
DATABASE_URL=postgresql://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:${DB_PORT}/${DB_NAME}
```
## Security Best Practices
1. **Never commit secrets** to version control
2. **Use strong, unique secrets** for production
3. **Rotate secrets regularly**
4. **Use environment-specific files**
5. **Validate all environment variables** at startup
6. **Use Docker secrets** for container deployments
## Validation
MCPHub validates environment variables at startup. Invalid configurations will prevent the application from starting with helpful error messages.
Required variables for production:
- `JWT_SECRET`
- `DATABASE_URL` or individual DB components
- `OPENAI_API_KEY` (if smart routing is enabled)
This comprehensive environment configuration ensures MCPHub can be properly configured for any deployment scenario.
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