| NC_DB | See our example database URLs [here](https://github.com/nocodb/nocodb#docker). | A local SQLite will be created in root folder if `NC_DB` is not provided |
| NC_DB_JSON | Can be used instead of `NC_DB` and value should be valid knex connection JSON | |
| NC_DB_JSON_FILE | Can be used instead of `NC_DB` and value should be a valid path to knex connection JSON | |
| NC_TOOL_DIR | App directory to keep metadata and app related files | Defaults to current working directory. In docker maps to `/usr/app/data/` for mounting volume. |
| NC_PUBLIC_URL | Used for sending Email invitations | Best guess from http request params |
| NC_JWT_EXPIRES_IN | JWT token expiry time | `10h` |
| NC_INVITE_ONLY_SIGNUP | Removed since version 0.99.0 and now it's recommended to use [super admin settings menu](/account-settings/oss-specific-details#enable--disable-signup). Allow users to signup only via invite URL, value should be any non-empty string. | |
| NC_DISABLE_CACHE | To be used only while debugging. On setting this to `true` - meta data be fetched from db instead of redis/cache. | `false` |
| AWS_ACCESS_KEY_ID | For Litestream - S3 access key id | If Litestream is configured and `NC_DB` is not present. SQLite gets backed up to S3 |
| AWS_SECRET_ACCESS_KEY | For Litestream - S3 secret access key | If Litestream is configured and `NC_DB` is not present. SQLite gets backed up to S3 |
| AWS_BUCKET | For Litestream - S3 bucket | If Litestream is configured and `NC_DB` is not present. SQLite gets backed up to S3 |
| AWS_BUCKET_PATH | For Litestream - S3 bucket path (like folder within S3 bucket) | If Litestream is configured and `NC_DB` is not present. SQLite gets backed up to S3 |
| NC_SMTP_HOST | For SMTP plugin - SMTP host value | |
| NC_SMTP_PORT | For SMTP plugin - SMTP port value | |
| NC_SMTP_USERNAME | For SMTP plugin (Optional) - SMTP username value for authentication | |
| NC_SMTP_PASSWORD | For SMTP plugin (Optional) - SMTP password value for authentication | |
| NC_SMTP_SECURE | For SMTP plugin (Optional) - To enable secure set value as `true` any other value treated as false | |
| NC_SMTP_IGNORE_TLS | For SMTP plugin (Optional) - To ignore tls set value as `true` any other value treated as false. For more info visit https://nodemailer.com/smtp/ | |
| NC_S3_BUCKET_NAME | For S3 storage plugin - AWS S3 bucket name | |
| NC_S3_REGION | For S3 storage plugin - AWS S3 region | |
| NC_S3_ACCESS_KEY | For S3 storage plugin - AWS access key credential for accessing resource | |
| NC_S3_ACCESS_SECRET | For S3 storage plugin - AWS access secret credential for accessing resource | |
| NC_ADMIN_EMAIL | For updating/creating super admin with provided email and password | |
| NC_ATTACHMENT_FIELD_SIZE | For setting the attachment field size(in Bytes) | Defaults to 20MB |
| NC_ADMIN_PASSWORD | For updating/creating super admin with provided email and password. Your password should have at least 8 letters with one uppercase, one number and one special letter(Allowed special chars $&+,:;=?@#\|'.^*()%!_-" ) | |
| NODE_OPTIONS | For passing Node.js [options](https://nodejs.org/api/cli.html#node_optionsoptions) to instance | |
| NC_MINIMAL_DBS | Create a new SQLite file for each project. All the db files are stored in `nc_minimal_dbs` folder in current working directory. (This option restricts project creation on external sources) | |
| NC_SECURE_ATTACHMENTS | Allow accessing attachments only through presigned urls. To enable set value as `true` any other value treated as false. (⚠ this will make existing links inaccessible ⚠) | `false` |
| NC_ATTACHMENT_EXPIRE_SECONDS | How many seconds before expiring presigned attachment urls. (Attachments will expire in at least set seconds and at most 10mins after set time) | 7200 (2 hours) |
| NC_ALLOW_LOCAL_HOOKS | To enable set value as `true` any other value treated as false. (⚠ this will allow webhooks to call local links which can raise security issues ⚠) | `false` |
