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`](https://github.com/hedgedoc/hedgedoc/tree/master/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](https://sequelize.org/v5/manual/dialects.html) |
| `db.username` | `CMD_DB_USERNAME` | **`undefined`**, `hedgedoc-db-user` | Username used to authenticate to the database (host). |
| `db.password` | `CMD_DB_PASSWORD` | **`undefined`** | Password used to authenticate to the database (host). |
| `db.database` | `CMD_DB_DATABASE` | **`undefined`**, `hedgedoc` | Name of the database used to store hedgedoc data. |
| `db.host` | `CMD_DB_HOST` | **`undefined`**, `db-host.example.com` | Hostname used to connect the database server. |
| `db.post` | `CMD_DB_PORT` | **`undefined`**, `5432` | Port used to connect the database server. |
| `db.dialect` | `CMD_DB_DIALECT` | **`undefined`**, `postgres`, `mariadb` | [Dialect](https://sequelize.org/v5/manual/dialects.html) / protocol used to connect to the database. |
| `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) |
| `tooBusyLag` | `CMD_TOOBUSY_LAG` | **`70`** | CPU time for one event loop tick until node throttles connections. (milliseconds) |
| `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, "addDefaults": true}` | Nested object to configure the Content Security Policy |
| `csp.enable` | `CMD_CSP_ENABLE` | **`true`** or `false` | Whether to apply a `Content-Security-Policy` header to responses. We don't recommend disabling this option, as it significantly reduces the security of the application. |
| `csp.addDefaults` | | **`true`** or `false` | Disable to not include the default CSP. Be careful, this will break the application if the correct directives are not set manually. |
| `csp.directives` | | **no default**, `{"scriptSrc": "trustworthy-scripts.example.com"}` | Custom CSP directives. These are passed to Helmet - see [their documentation](https://helmetjs.github.io/docs/csp/) for more information on the format. |
| `csp.addDisqus` | `CMD_CSP_ADD_DISQUS` | **`false`** or `true` | Enable to allow users to add Disqus comments to their notes or presentations. We don't recommend enabling this option, as it increases the attack surface of XSS attacks. |
| `csp.addGoogleAnalytics` | `CMD_CSP_ADD_GOOGLE_ANALYTICS` | **`false`** or `true` | Enable to allow users to add Google Analytics to their notes. We don't recommend enabling this option, as it increases the attack surface of XSS attacks. |
| `csp.upgradeInsecureRequests` | | **`auto`** or `true` or `false` | By default (`auto`), insecure (HTTP) requests are upgraded to HTTPS via CSP if `useSSL` is on. To change this behaviour, set to either `true` or `false`. |
| `csp.reportUri` | `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. |
| `csp.allowFraming` | `CMD_CSP_ALLOW_FRAMING` | **`true`** or `false` | Disable to disallow embedding of the instance via iframe. We **strongly recommend disabling** this option, as it increases the attack surface of XSS attacks. |
| `csp.allowPDFEmbed` | `CMD_CSP_ALLOW_PDF_EMBED` | **`true`** or `false` | Disable to disallow embedding PDFs. We recommend disabling this option, as it increases the attack surface of XSS attacks. |
| `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. |
| `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). |
| `requireFreeURLAuthentication` | `CMD_REQUIRE_FREEURL_AUTHENTICATION` | **`false`** or `true` | Set to require authentication for FreeURL mode style note creation. |
| `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. Can be generated with e.g. `pwgen -s 64 1`. |
| `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) |
