Environment variables take precedence over configurations from the config files. They generally start with `CMD_` for our own options, but we also list node-specific options you can configure this way.
- Environment variables are processed in [`lib/config/environment.js`](https://github.com/hedgedoc/hedgedoc/tree/master/lib/config/environment.js) - so this is the first place to look if anything is missing not obvious from this document. The default values are defined in [`lib/config/default.js`](https://github.com/hedgedoc/hedgedoc/tree/master/lib/config/default.js), in case you wonder if you even need to override it.
- The config file is processed in [`lib/config/index.js`](https://github.com/hedgedoc/hedgedoc/tree/master/lib/config/index.js) - so this is the first place to look if anything is missing not obvious from this document. The default values are defined in [`lib/config/default.js`](https://github.com/hedgedoc/hedgedoc/tree/master/lib/config/default.js), in case you wonder if you even need to override it. To get started, it is a good idea to take the `config.json.example` and copy it
| | `CMD_CONFIG_FILE` | **no default**, `/path/to/config.json` | optional override for the path to HedgeDoc's config file |
| `db` | | **`undefined`**, `{ "dialect": "sqlite", "storage": "./db.hedgedoc.sqlite" }` | set the db configs, [see more here](http://sequelize.readthedocs.org/en/latest/api/sequelize/) |
| `dbURL` | `CMD_DB_URL` | **`undefined`**, `postgres://username:password@localhost:5432/hedgedoc` or `mysql://username:password@localhost:3306/hedgedoc`| Set the db in URL style. If set, then the relevant `db` config entries will be overridden. |
| `loglevel` | `CMD_LOGLEVEL` | **`info`**, `debug` ... | Defines what kind of logs are provided to stdout. Available options: `debug`, `verbose`, `info`, `warn`, `error` |
| `forbiddenNoteIDs` | `CMD_FORBIDDEN_NOTE_IDS` | **`['robots.txt', 'favicon.ico', 'api', 'build', 'css', 'docs', 'fonts', 'js', 'uploads', 'vendor', 'views']`**, `['robots.txt']` or `'robots.txt'` | disallow creation of notes, even if `allowFreeUrl` or `CMD_ALLOW_FREEURL` is `true` |
| `imageUploadType` | `CMD_IMAGE_UPLOAD_TYPE` | **`filesystem`**, `imgur`, `s3`, `minio`, `azure`, `lutim` | Where to upload images. For S3, see our Image Upload Guides for [S3](guides/s3-image-upload.md) or [Minio](guides/minio-image-upload.md), also there's a whole section on their respective env vars below. |
| `sourceURL` | `CMD_SOURCE_URL` | **no default**, `https://github.com/hedgedoc/hedgedoc/tree/<current commit>` | Provides the link to the source code of HedgeDoc on the entry page (Please, make sure you change this when you run a modified version) |
| `path` | `CMD_PATH` | **no default**, `/var/run/hedgedoc.sock` | path to UNIX domain socket to listen on (if specified, `host` or `CMD_HOST` and `port` or `CMD_PORT` are ignored) |
| `protocolUseSSL` | `CMD_PROTOCOL_USESSL` | **`false`** or `true` | set to use SSL protocol for resources path (only applied when domain is set) |
| `useSSL` | | **`false`** or `true` | set to use SSL server (if `true`, will auto turn on `protocolUseSSL`) |
| `urlAddPort` | `CMD_URL_ADDPORT` | **`false`** or `true` | set to add port on callback URL (ports `80` or `443` won't be applied) (only applied when domain is set) |
| `hsts` | | `{"enable": true, "maxAgeSeconds": 31536000, "includeSubdomains": true, "preload": true}` | [HSTS](https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security) options to use with HTTPS (default is the example value, max age is a year) |
| | `CMD_HSTS_ENABLE` | **`true`** or `false` | set to enable [HSTS](https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security) if HTTPS is also enabled (default is ` true`) |
| | `CMD_HSTS_INCLUDE_SUBDOMAINS` | **`true`** or `false` | set to include subdomains in HSTS (default is `true`) |
| | `CMD_HSTS_MAX_AGE` | **`31536000`**, `60 * 60 * 24 * 365` | max duration in seconds to tell clients to keep HSTS status (default is a year) |
| | `CMD_HSTS_PRELOAD` | **`true`** or `false` | whether to allow preloading of the site's HSTS status (e.g. into browsers) |
| `csp` | | `{"enable": true, "directives": {"scriptSrc": "trustworthy-scripts.example.com"}, "upgradeInsecureRequests": "auto", "addDefaults": true}` | Configures [Content Security Policy](https://helmetjs.github.io/docs/csp/). Directives are passed to Helmet - see [their documentation](https://helmetjs.github.io/docs/csp/) for more information on the format. Some defaults are added to the configured values so that the application doesn't break. To disable this behaviour, set `addDefaults` to `false`. Further, if `usecdn` is on, some CDN locations are allowed too. By default (`auto`), insecure (HTTP) requests are upgraded to HTTPS via CSP if `useSSL` is on. To change this behaviour, set `upgradeInsecureRequests` to either `true` or `false`. |
| | `CMD_CSP_ENABLE` | **`true`** or `false` | whether to enable Content Security Policy (directives cannot be configured with environment variables) |
| | `CMD_CSP_REPORTURI` | **`undefined`**, `https://<someid>.report-uri.com/r/d/csp/enforce` | Allows to add a URL for CSP reports in case of violations |
| `cookiePolicy` | `CMD_COOKIE_POLICY` | **`lax`**, `strict` or `none` | Set a SameSite policy whether cookies are send from cross-origin. Be careful: setting a SameSite value of none without https breaks the editor |
| `allowGravatar` | `CMD_ALLOW_GRAVATAR` | **`true`** or `false` | set to `false` to disable [Libravatar](https://www.libravatar.org/) as profile picture source on your instance. Libravatar is a federated open-source alternative to Gravatar. |
| `useCDN` | `CMD_USECDN` | **`false`** or `true` | set to use CDN resources or not (default is `false`) |
| `allowAnonymous` | `CMD_ALLOW_ANONYMOUS` | **`true`** or `false` | Set to allow anonymous usage (default is `true`). |
| `allowAnonymousEdits` | `CMD_ALLOW_ANONYMOUS_EDITS` | **`false`** or `true` | If `allowAnonymous` is `false`: allow users to select `freely` permission, allowing guests to edit existing notes (default is `false`). |
| `allowFreeURL` | `CMD_ALLOW_FREEURL` | **`false`** or `true` | Set to allow new note creation by accessing a nonexistent note URL. This is the behavior familiar from [Etherpad](https://github.com/ether/etherpad-lite). |
| `defaultPermission` | `CMD_DEFAULT_PERMISSION` | **`editable`**, `freely`, `limited`, `locked`, `protected` or `private` | Set notes default permission (only applied on signed-in users). |
| `sessionLife` | `CMD_SESSION_LIFE` | **`14 * 24 * 60 * 60 * 1000`**, `1209600000` (14 days) | Cookie session life time in milliseconds. |
| `sessionSecret` | `CMD_SESSION_SECRET` | **`secret`** | Cookie session secret used to sign the session cookie. If none is set, one will randomly generated on each startup, meaning all your users will be logged out. |
| `email` | `CMD_EMAIL` | **`true`** or `false` | Set to allow email sign-in. The default is `true`. |
| `allowEmailRegister` | `CMD_ALLOW_EMAIL_REGISTER` | **`true`** or `false` | Set to allow registration of new accounts using an email address. If set to `false`, you can still create accounts using the command line - see `bin/manage_users` for details (In production mode, remember to run it with `NODE_ENV` set as `production` in the enviroment). This setting has no effect if `email` or `CMD_EMAIL` is `false`. The default for `allowEmailRegister` or `CMD_ALLOW_EMAIL_REGISTER` is `true`. |
| `dropbox` | | `{clientID: ..., clientSecret: ...}` | An object containing the client ID and the client secret obtained by the [Dropbox developer tools](https://www.dropbox.com/developers/apps) |
| `facebook` | | `{clientID: ..., clientSecret: ...}` | An object containing the client ID and the client secret obtained by the [Facebook app console](https://developers.facebook.com/apps) |
| `github` | | `{clientID: ..., clientSecret: ...}` | An object containing the client ID and the client secret obtained by the GitHub developer page. For more details have a look at the [GitHub auth guide](guides/auth/github.md). |
| `google` | | `{clientID: ..., clientSecret: ..., hostedDomain: ...}` | An object containing the client ID and the client secret obtained by the [Google API console](https://console.cloud.google.com/apis) |
| | `CMD_LDAP_USERIDFIELD` | **no default**, `uidNumber` or `uid` or `sAMAccountName` | The LDAP field which is used uniquely identify a user on HedgeDoc |
| | `CMD_LDAP_USERNAMEFIELD` | **no default**, fallback to userid | The LDAP field which is used as the username on HedgeDoc |
| `mattermost` | | `{baseURL: ..., clientID: ..., clientSecret: ...}` | An object containing the base URL of your Mattermost application data. Refer to the [Mattermost guide](guides/auth/mattermost-self-hosted.md) for more details! |
| | `CMD_MATTERMOST_BASEURL` | **no default** | Mattermost authentication endpoint for versions below 5.0. For Mattermost version 5.0 and above, see [guide](guides/auth/mattermost-self-hosted.md). |
| | `CMD_MATTERMOST_CLIENTID` | **no default** | Mattermost API client id |
| | `CMD_OAUTH2_USER_PROFILE_URL` | **no default**, `https://example.com` | Where to retrieve information about a user after successful login. Needs to output JSON. (no default value) Refer to the [Mattermost](guides/auth/mattermost-self-hosted.md) or [Nextcloud](guides/auth/nextcloud.md) examples for more details on all of the `CMD_OAUTH2...` options. |
| | `CMD_OAUTH2_USER_PROFILE_USERNAME_ATTR` | **no default**, `name` | where to find the username in the JSON from the user profile URL. (no default value) |
| | `CMD_OAUTH2_USER_PROFILE_DISPLAY_NAME_ATTR` | **no default**, `display-name` | where to find the display-name in the JSON from the user profile URL. (no default value) |
| | `CMD_OAUTH2_USER_PROFILE_EMAIL_ATTR` | **no default**, `email` | where to find the email address in the JSON from the user profile URL. (no default value) |
| | `CMD_OAUTH2_USER_PROFILE_ID_ATTR` | **no default**, `user_uuid` | where to find the dedicated user ID (optional, overrides `CMD_OAUTH2_USER_PROFILE_USERNAME_ATTR`) |
| | `CMD_OAUTH2_TOKEN_URL` | **no default**, `https://example.com` | sometimes called token endpoint, please refer to the documentation of your OAuth2 provider (no default value) |
| | `CMD_OAUTH2_AUTHORIZATION_URL` | **no default**, `https://example.com` | authorization URL of your provider, please refer to the documentation of your OAuth2 provider (no default value) |
| | `CMD_OAUTH2_CLIENT_ID` | **no default**, `afae02fckafd...` | you will get this from your OAuth2 provider when you register HedgeDoc as OAuth2-client, (no default value) |
| | `CMD_OAUTH2_CLIENT_SECRET` | **no default**, `afae02fckafd...` | you will get this from your OAuth2 provider when you register HedgeDoc as OAuth2-client, (no default value) |
| `twitter` | | `{consumerKey: ..., consumerSecret: ...}` | An object containing the consumer key and secret obtained by the [Twitter developer tools](https://developer.twitter.com/apps). For more details have a look at the [Twitter auth guide](guides/auth/twitter.md) |
| `s3` | | `{ "accessKeyId": "YOUR_S3_ACCESS_KEY_ID", "secretAccessKey": "YOUR_S3_ACCESS_KEY", "region": "YOUR_S3_REGION" }` | When `imageuploadtype` be set to `s3`, you would also need to setup this key, check our [S3 Image Upload Guide](guides/s3-image-upload.md) |
| `minio` | | `{ "accessKey": "YOUR_MINIO_ACCESS_KEY", "secretKey": "YOUR_MINIO_SECRET_KEY", "endpoint": "YOUR_MINIO_HOST", port: 9000, secure: true }` | When `imageUploadType` is set to `minio`, you need to set this key. Also check out our [Minio Image Upload Guide](guides/minio-image-upload.md) |
