### Environment variables for add-on connections

Source: https://snapdeploy.dev/docs/addon-services

Connection details are automatically injected as environment variables when an add-on is provisioned. The example shows the variable names and URL formats for Redis, PostgreSQL, MySQL, and MongoDB.

```plaintext
# Redis
REDIS_URL=redis://user:pass@host:6379
# PostgreSQL
DATABASE_URL=postgres://user:pass@host:5432/db
# MySQL
MYSQL_URL=mysql://user:pass@host:3306/db
# MongoDB
MONGODB_URI=mongodb://user:pass@host:27017/db
```

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