| ENGINE\_TYPE | string | exareme | Define the connector that should be used : **`exareme, datashield, csv, local`**. |
| ENGINE\_TYPE | string | exareme | Define the connector that should be used : **`exareme, datashield, csv, local`**. |
| ENGINE\_BASE\_URL | string | http://127.0.0.1:8080/services/ | Specify the endpoint for the data source. The parameter will be provided for the connector. |
| ENGINE\_BASE\_URL | string | http://127.0.0.1:8080/services/ | Specify the endpoint for the data source. The parameter will be provided for the connector. |
| TOS\_SKIP | boolean | false | Allow to skip the `terms of services` (this parameter is provided to the frontend) |
| TOS\_SKIP | boolean | false | Allow to skip the `terms of services` (this parameter is provided to the frontend) |
| GATEWAY\_PORT | number | 8081 | Indicate the port that should be used by the gateway |
| GATEWAY\_PORT | number | 8081 | Indicate the port that should be used by the gateway |
| NODE\_ENV | string | dev | Value can be `prod` or `dev` |
| NODE\_ENV | string | dev | Value can be `prod` or `dev`|
| BASE\_URL\_CONTEXT | string | null | Define context of the gateway. E.g. `api` if the api is under `http://127.0.0.1/api/` |
| LOG\_LEVEL | number | 1 in production, 4 otherwise | <p>Values in range [1;4] <br>1: 'warn', 'error'<br>2: 'warn', 'error', 'log'</p><p>3: 'warn', 'error', 'log', 'verbose'<br>4: 'warn', 'error', 'log', 'verbose', 'debug'</p> |
