jellyfin_webhook_ntfy.handlebars

This is a ntfy.sh template for the Jellyfin Webhook plugin.

I got most of the inspiration from the examples here:
https://github.com/jellyfin/jellyfin-plugin-webhook/tree/master/Jellyfin.Plugin.Webhook/Templates

I've tried most of the notifications, but let me know if something isn't working.
I'm pretty sure AuthenticationSuccess and AuthenticationFailure doesn't work at all, since there isn't any mention of them on the Notifications page on Jellyfin. If anyone has any ideas, an issue or a PR would be awesome.

I'm sure it's possible to slim down this template quite a bit, but this is what we got for the moment. :)

To enable the notifications, install the Webhook plugin, then click "Add Generic Destination" on the settings page.
Set the "Webook URL" to your ntfy server, for example: ntfy.sh
Check the boxes you want notifications from. (Make sure they are checked on the "Notifications" page as well.)
Click "Add Request Header" (If you need to login) and enter "Authorization" in the Key field.
In the "Value" field you need to enter a base64 encoded string of your username:password, prepended by "Basic"
See https://docs.ntfy.sh/publish/#username-password , the oneliner you need is probably:
echo "Basic $(echo -n 'testuser:fakepassword' | base64)"

Paste everything below this in the "Template" box, and click save. Do not forget to edit the "topic" field.

{
    "topic": "jellyfin",
    "tags": ["octopus"],
    "icon": "{{ServerUrl}}/web/favicon.png",
    {{#if_equals NotificationType 'Generic'}}
        "title": "Jellyfin: Generic notification",
        "message": "{{Name}}",
        "actions": [
                     {
                       "action": "view",
                       "label": "Open Jellyfin",
                       "url": "{{ServerUrl}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'ItemAdded'}}
        "attach": "{{ServerUrl}}/Items/{{ItemId}}/Images/Primary",
        {{~#if_exist Provider_imdb~}}
             "title": "Jellyfin: Item added",
             "actions": [
                          {
                            "action": "view",
                            "label": "Open Jellyfin",
                            "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                            "clear": true
                          },
                          {
                            "action": "view",
                            "label": "IMDb",
                            "url": "https://www.imdb.com/title/{{Provider_imdb}}/",
                            "clear": true
                          }
                        ],
        {{~/if_exist~}}
        {{~#if_exist Provider_tvdb~}}
             {{~#if_equals ItemType 'Movie'~}}
                  "title": "Jellyfin: Movie added",
                  "actions": [
                               {
                                 "action": "view",
                                 "label": "Open Jellyfin",
                                 "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                                 "clear": true
                               },
                               {
                                 "action": "view",
                                 "label": "tvdb",
                                 "url": "https://thetvdb.com/dereferrer/movie/{{Provider_tvdb}}",
                                 "clear": true
                               }
                             ],
             {{~else~}}
                  {{~#if_equals ItemType 'Season'~}}
                       "title": "Jellyfin: Season added",
                       "actions": [
                                    {
                                      "action": "view",
                                      "label": "Open Jellyfin",
                                      "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                                      "clear": true
                                    },
                                    {
                                      "action": "view",
                                      "label": "tvdb",
                                      "url": "https://thetvdb.com/dereferrer/season/{{Provider_tvdb}}",
                                      "clear": true
                                    }
                                  ],
                  {{~else~}}
                       "title": "Jellyfin: Episode added",
                       "actions": [
                                    {
                                      "action": "view",
                                      "label": "Open Jellyfin",
                                      "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                                      "clear": true
                                    },
                                    {
                                      "action": "view",
                                      "label": "tvdb",
                                      "url": "https://thetvdb.com/dereferrer/episode/{{Provider_tvdb}}",
                                      "clear": true
                                    }
                                  ],
                  {{~/if_equals~}}
             {{~/if_equals~}}
        {{~/if_exist~}}
        {{~#if_exist Provider_tmdb~}}
             {{~#if_equals ItemType 'Movie'~}}
                  "title": "Jellyfin: Movie added",
                  "actions": [
                               {
                                 "action": "view",
                                 "label": "Open Jellyfin",
                                 "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                                 "clear": true
                               },
                               {
                                 "action": "view",
                                 "label": "TMDb",
                                 "url": "https://www.themoviedb.org/movie/{{Provider_tmdb}}",
                                 "clear": true
                               }
                             ],
             {{~else~}}
                  "title": "Jellyfin: Episode added",
                  "actions": [
                               {
                                 "action": "view",
                                 "label": "Open Jellyfin",
                                 "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                                 "clear": true
                               },
                               {
                                 "action": "view",
                                 "label": "TMDb",
                                 "url": "https://www.themoviedb.org/tv/{{Provider_tmdb}}",
                                 "clear": true
                               }
                             ],
             {{~/if_equals~}}
        {{~/if_exist~}}
        {{~#if_exist Provider_musicbrainzartist~}}
             "title": "Jellyfin: Music added",
             "actions": [
                          {
                            "action": "view",
                            "label": "Open Jellyfin",
                            "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                            "clear": true
                          },
                          {
                            "action": "view",
                            "label": "MusicBrainz",
                            "url": "https://musicbrainz.org/artist/{{Provider_musicbrainzartist}}",
                            "clear": true
                          }
                        ],
        {{~/if_exist~}}
        {{#if_exist Provider_audiodbartist}}
            "title": "Jellyfin: Music added",
            "actions": [
                         {
                           "action": "view",
                           "label": "Open Jellyfin",
                           "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                           "clear": true
                         },
                         {
                           "action": "view",
                           "label": "AudioDb",
                           "url": "https://theaudiodb.com/artist/{{Provider_audiodbartist}}",
                           "clear": true
                         }
                       ],
        {{~/if_exist~}}
        {{~#if_exist Provider_musicbrainztrack~}}
             "title": "Jellyfin: Music added",
             "actions": [
                          {
                            "action": "view",
                            "label": "Open Jellyfin",
                            "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                            "clear": true
                          },
                          {
                            "action": "view",
                            "label": "MusicBrainz Track",
                            "url": "https://musicbrainz.org/track/{{Provider_musicbrainztrack}}",
                            "clear": true
                          }
                        ],
        {{~/if_exist~}}
        {{~#if_exist Provider_musicbrainzalbum~}}
             "title": "Jellyfin: Music album added",
             "actions": [
                          {
                            "action": "view",
                            "label": "Open Jellyfin",
                            "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                            "clear": true
                          },
                          {
                            "action": "view",
                            "label": "MusicBrainz Album",
                            "url": "https://musicbrainz.org/release/{{Provider_musicbrainzalbum}}",
                            "clear": true
                          }
                        ],
        {{~/if_exist~}}
        {{#if_exist Provider_theaudiodbalbum}}
            "title": "Jellyfin: Music album added",
            "actions": [
                         {
                           "action": "view",
                           "label": "Open Jellyfin",
                           "url": "{{ServerUrl}}/web/index.html#!/details?id={{ItemId}}&serverId={{ServerId}}",
                           "clear": true
                         },
                         {
                           "action": "view",
                           "label": "TADb Album",
                           "url": "https://theaudiodb.com/album/{{Provider_theaudiodbalbum}}",
                           "clear": true
                         }
                       ],
        {{~/if_exist~}}
        {{#if_equals ItemType 'Episode'}}
            "message": "{{SeriesName}} - S{{SeasonNumber00}}E{{EpisodeNumber00}} - {{Name}}"
        {{else}}
            {{#if_equals ItemType 'Season'}}
                "message": "{{SeriesName}} - {{Name}}"
            {{else}}
                "message": "{{Name}} - ({{Year}}) - {{RunTime}}"
            {{/if_equals}}
        {{/if_equals}}
    {{/if_equals}}
    {{#if_equals NotificationType 'PlaybackStart'}}
        "title": "Jellyfin: Playback start",
        {{#if_equals ItemType 'Episode'}}
            "message": "User {{NotificationUsername}} started playing:\n{{SeriesName}} S{{SeasonNumber00}}E{{EpisodeNumber00}} {{Name}}",
            "actions": [
                         {
                           "action": "view",
                           "label": "Manage user",
                           "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                           "clear": true
                         }
                       ]
        {{else}}
            "message": "User {{NotificationUsername}} started playing:\n{{Name}} ({{Year}}) {{RunTime}}",
            "actions": [
                         {
                           "action": "view",
                           "label": "Manage user",
                           "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                           "clear": true
                         }
                       ]
        {{/if_equals}}
    {{/if_equals}}
    {{#if_equals NotificationType 'PlaybackProgress'}}
        "title": "Jellyfin: Playback progress",
        {{#if_equals ItemType 'Episode'}}
            "message": "User {{NotificationUsername}} is playing:\n{{SeriesName}} S{{SeasonNumber00}}E{{EpisodeNumber00}} {{Name}}, at position {{PlaybackPosition}} of {{RunTime}}",
            "actions": [
                         {
                           "action": "view",
                           "label": "Manage user",
                           "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                           "clear": true
                         }
                       ]
        {{else}}
            "message": "User {{NotificationUsername}} is playing:\n{{Name}} ({{Year}}) at position {{PlaybackPosition}} of {{RunTime}}",
            "actions": [
                         {
                           "action": "view",
                           "label": "Manage user",
                           "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                           "clear": true
                         }
                       ]
        {{/if_equals}}
    {{/if_equals}}
    {{#if_equals NotificationType 'PlaybackStop'}}
        "title": "Jellyfin: Playback stop",
        {{#if_equals ItemType 'Episode'}}
            "message": "User {{NotificationUsername}} stopped playing:\n{{SeriesName}} S{{SeasonNumber00}}E{{EpisodeNumber00}} {{Name}}",
            "actions": [
                         {
                           "action": "view",
                           "label": "Manage user",
                           "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                           "clear": true
                         }
                       ]
        {{else}}
            "message": "User {{NotificationUsername}} stopped playing:\n{{Name}} ({{Year}})",
            "actions": [
                         {
                           "action": "view",
                           "label": "Manage user",
                           "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                           "clear": true
                         }
                       ]
        {{/if_equals}}
    {{/if_equals}}
    {{#if_equals NotificationType 'SubtitleDownloadFailure'}}
        "title": "Jellyfin: Subtitle download failure",
        {{#if_equals ItemType 'Episode'}}
            "message": "Warning: Subtitle failed to download:\n{{SeriesName}} - S{{SeasonNumber00}}E{{EpisodeNumber00}} - {{Name}}"
        {{else}}
            "message": "Warning: Subtitle failed to download:\n{{Name}} - ({{Year}})"
        {{/if_equals}}
    {{/if_equals}}
    {{#if_equals NotificationType 'TaskCompleted'}}
        "title": "Jellyfin: Task completed",
        "message": "Task completed with status {{ResultStatus}}, check logs for details",
        "actions": [
                     {
                       "action": "view",
                       "label": "Open logs",
                       "url": "{{ServerUrl}}/web/index.html#!/log.html",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'PendingRestart'}}
        "title": "Jellyfin: Server needs to be restarted",
        "message": "Check logs for details"
    {{/if_equals}}
    {{#if_equals NotificationType 'PluginInstallationCancelled'}}
        "title": "Jellyfin: Plugin installation cancelled",
        "message": "Check logs for details",
        "actions": [
                     {
                       "action": "view",
                       "label": "Open logs",
                       "url": "{{ServerUrl}}/web/index.html#!/log.html",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'PluginInstallationFailed'}}
        "title": "Jellyfin: Plugin installation failed",
        "message": "Check logs for details",
        "actions": [
                     {
                       "action": "view",
                       "label": "Open logs",
                       "url": "{{ServerUrl}}/web/index.html#!/log.html",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'PluginInstalled'}}
        "title": "Jellyfin: Plugin successfully installed",
        "message": "Server restart needed",
        "actions": [
                     {
                       "action": "view",
                       "label": "Open logs",
                       "url": "{{ServerUrl}}/web/index.html#!/log.html",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'PluginInstalling'}}
        "title": "Jellyfin: Plugin is installing now",
        "message": "Check logs for details"
    {{/if_equals}}
    {{#if_equals NotificationType 'PluginUninstalled'}}
        "title": "Jellyfin: Plugin successfully uninstalled",
        "message": "Check logs for details",
        "actions": [
                     {
                       "action": "view",
                       "label": "Open logs",
                       "url": "{{ServerUrl}}/web/index.html#!/log.html",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'PluginUpdated'}}
        "title": "Jellyfin: Plugin successfully updated",
        "message": "Check logs for details",
        "actions": [
                     {
                       "action": "view",
                       "label": "Open logs",
                       "url": "{{ServerUrl}}/web/index.html#!/log.html",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'SessionStart'}}
        "title": "Jellyfin: User active",
        "message": "User {{NotificationUsername}} now active.\nClient: {{ClientName}}\nDevice: {{DeviceName}}",
        "actions": [
                     {
                       "action": "view",
                       "label": "Manage user",
                       "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'UserCreated'}}
        "title": "Jellyfin: User created",
        "message": "User {{NotificationUsername}} was added successfully",
        "actions": [
                     {
                       "action": "view",
                       "label": "Manage user",
                       "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'UserDeleted'}}
        "title": "Jellyfin: User deleted",
        "message": "User {{NotificationUsername}} was deleted",
        "actions": [
                     {
                       "action": "view",
                       "label": "Manage user",
                       "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'UserLockedOut'}}
        "title": "Jellyfin: User locked out",
        "message": "Warning: User {{NotificationUsername}} was locked out.",
        "actions": [
                     {
                       "action": "view",
                       "label": "Manage user",
                       "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'UserPasswordChanged'}}
        "title": "Jellyfin: User password changed",
        "message": "User {{NotificationUsername}} password changed successfully",
        "actions": [
                     {
                       "action": "view",
                       "label": "Manage user",
                       "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'UserUpdated'}}
        "title": "Jellyfin: User updated",
        "message": "User {{NotificationUsername}} was updated successfully",
        "actions": [
                     {
                       "action": "view",
                       "label": "Manage user",
                       "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'UserDataSaved'}}
        "title": "Jellyfin: User data saved",
        "message": "User {{NotificationUsername}} data was saved",
        "actions": [
                     {
                       "action": "view",
                       "label": "Manage user",
                       "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'AuthenticationSuccess'}}
        "title": "Jellyfin: Authentication success",
        "message": "User {{NotificationUsername}} successfully logged on. Client: {{ClientName}} Device: {{DeviceName}}",
        "actions": [
                     {
                       "action": "view",
                       "label": "Manage user",
                       "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
    {{#if_equals NotificationType 'AuthenticationFailure'}}
        "title": "Jellyfin: Authentication failed",
        "message": "Warning: User {{NotificationUsername}} failed to authenticate. Client: {{ClientName}} Device: {{DeviceName}}, check server logs for details",
        "actions": [
                     {
                       "action": "view",
                       "label": "Manage user",
                       "url": "{{ServerUrl}}/web/index.html#!/useredit.html?userId={{UserId}}",
                       "clear": true
                     }
                   ]
    {{/if_equals}}
}