# Configuring SQLPage
SQLPage can be configured through either [environment variables](https://en.wikipedia.org/wiki/Environment_variable)
on a [JSON](https://en.wikipedia.org/wiki/JSON) file placed in `sqlpage/sqlpage.json`.
The name of configuration variables must be written in uppercase when set in environment variables
and in lowercase when set in the configuration file.
| `listen_on` | 0.0.0.0:8080 | Interface and port on which the web server should listen |
| `database_url` | sqlite://sqlpage.db?mode=rwc | Database connection URL |
| `port` | 8080 | Like listen_on, but specifies only the port. |
| `max_database_pool_connections` | depends on the database | How many simultaneous database connections to open at most |
| `database_connection_idle_timeout_seconds` | depends on the database | Automatically close database connections after this period of inactivity |
| `database_connection_max_lifetime_seconds` | depends on the database | Always close database connections after this amount of time |
You can find an example configuration file in [`sqlpage/sqlpage.json`](./sqlpage/sqlpage.json)