diff --git a/src/components/AppNavigation/CalendarList/Trashbin.vue b/src/components/AppNavigation/CalendarList/Trashbin.vue
index b3d5e47426..57599996b8 100644
--- a/src/components/AppNavigation/CalendarList/Trashbin.vue
+++ b/src/components/AppNavigation/CalendarList/Trashbin.vue
@@ -297,6 +297,7 @@ export default {
 		/**
 		 * Whether the current user is allowed to restore a deleted calendar.
 		 *
+		 * @param {object} calendar The calendar to check
 		 * @return {boolean}
 		 */
 		canRestoreCalendar(calendar) {
@@ -308,6 +309,7 @@ export default {
 		/**
 		 * Whether the current user is allowed to permanently delete a deleted calendar.
 		 *
+		 * @param {object} calendar The calendar to check
 		 * @return {boolean}
 		 */
 		canDeleteCalendar(calendar) {
diff --git a/src/components/CalendarGrid.vue b/src/components/CalendarGrid.vue
index 13089335f7..a547063877 100644
--- a/src/components/CalendarGrid.vue
+++ b/src/components/CalendarGrid.vue
@@ -323,6 +323,8 @@ export default {
 		/**
 		 * Scroll the month view to today when loading the calendar,
 		 * so people can directly see today's date and events.
+		 *
+		 * @param {boolean} isLoading Whether the calendar is still loading
 		 */
 		scrollMonthViewToToday(isLoading) {
 			if (isLoading) {
@@ -352,6 +354,8 @@ export default {
 
 		/**
 		 * Add a todo task without end date to the calendar
+		 *
+		 * @param {object} info The FullCalendar eventReceive info
 		 */
 		async handleEventReceive(info) {
 			const { event } = info
diff --git a/src/components/Shared/CalendarPicker.vue b/src/components/Shared/CalendarPicker.vue
index 4857b42a1b..10992b62b2 100644
--- a/src/components/Shared/CalendarPicker.vue
+++ b/src/components/Shared/CalendarPicker.vue
@@ -137,7 +137,7 @@ export default {
 		/**
 		 * TODO: this should emit the calendar id instead
 		 *
-		 * @param {{id: string}|{id: string}[]} options All selected options (including the new one)
+		 * @param {{id: string}} optionId The selected option
 		 */
 		change(optionId) {
 			if (!optionId) {
diff --git a/src/fullcalendar/interaction/eventClick.js b/src/fullcalendar/interaction/eventClick.js
index a42266dbfe..c2e1cb4f25 100644
--- a/src/fullcalendar/interaction/eventClick.js
+++ b/src/fullcalendar/interaction/eventClick.js
@@ -94,7 +94,7 @@ function handleEventClick(event, router, route, window, isWidget = false) {
  * @param {EventDef} event FullCalendar event
  * @param {object} route The current Vue route
  * @param {Window} window The window object
- * @param isWidget
+ * @param {boolean} isWidget Whether the calendar is embedded as a widget
  */
 function handleToDoClick(event, route, window, isWidget = false) {
 	const settingsStore = useSettingsStore()
diff --git a/src/mixins/EditorMixin.js b/src/mixins/EditorMixin.js
index 64bd30a829..71e4eb68ef 100644
--- a/src/mixins/EditorMixin.js
+++ b/src/mixins/EditorMixin.js
@@ -604,7 +604,7 @@ export default {
 		/**
 		 * Resets the calendar-object back to its original state and closes the editor
 		 *
-		 * @param force whether to not show a confirmation modal before executing
+		 * @param {boolean} force whether to not show a confirmation modal before executing
 		 */
 		async cancel(force = false) {
 			if (this.isLoading) {
diff --git a/src/mixins/PropertyLinksMixin.js b/src/mixins/PropertyLinksMixin.js
index d920e37e67..bf95603599 100644
--- a/src/mixins/PropertyLinksMixin.js
+++ b/src/mixins/PropertyLinksMixin.js
@@ -64,7 +64,7 @@ export default {
 		},
 
 		/**
-		 * @param {boolean} hasFocus
+		 * @param {boolean} hasFocus Whether the textarea currently has focus
 		 */
 		handleToggleTextareaFocus(hasFocus) {
 			if (this.linkifyLinks === false) {
diff --git a/src/models/appointmentConfig.js b/src/models/appointmentConfig.js
index e70485540b..62f7780d1a 100644
--- a/src/models/appointmentConfig.js
+++ b/src/models/appointmentConfig.js
@@ -108,8 +108,8 @@ export default class AppointmentConfig {
 	/**
 	 * Create a default appointment config instance
 	 *
-	 * @param {string} targetCalendarUri
-	 * @param {ScheduleInbox} scheduleInbox
+	 * @param {string} targetCalendarUri URI of the calendar new appointments are booked into
+	 * @param {ScheduleInbox} scheduleInbox The schedule inbox to derive default availability from
 	 * @param {string} timezoneId fallback time zone when no schedule inbox availability is set
 	 * @return {AppointmentConfig} Default appointment config instance
 	 */
diff --git a/src/models/recurrenceRule.js b/src/models/recurrenceRule.js
index fbd5f6eb0a..b6568ed462 100644
--- a/src/models/recurrenceRule.js
+++ b/src/models/recurrenceRule.js
@@ -120,7 +120,7 @@ const SUPPORTED_BY_MONTH_YEARLY = [...Array(12).keys().map((i) => i + 1)]
 /**
  * Maps a daily calendar-js recurrence-rule-value to an recurrence-rule-object
  *
- * @param recurrenceRuleValue
+ * @param {RecurValue} recurrenceRuleValue The calendar-js recurrence rule value
  * @return {object}
  */
 function mapDailyRuleValueToRecurrenceRuleObject(recurrenceRuleValue) {
diff --git a/src/services/appointmentService.js b/src/services/appointmentService.js
index 1402449004..d00f2f9224 100644
--- a/src/services/appointmentService.js
+++ b/src/services/appointmentService.js
@@ -7,9 +7,9 @@ import axios from '@nextcloud/axios'
 import { generateUrl } from '@nextcloud/router'
 
 /**
- * @param config {object} the appointment config object
- * @param date {string} selected availability date in yyyy-m-d format
- * @param timeZone {String} target time zone for the time stamps
+ * @param {object} config the appointment config object
+ * @param {string} date selected availability date in yyyy-m-d format
+ * @param {string} timeZone target time zone for the time stamps
  */
 export async function findSlots(config, date, timeZone) {
 	const url = generateUrl('/apps/calendar/appointment/{token}/slots?dateSelected={date}&timeZone={timeZone}', {
@@ -24,12 +24,12 @@ export async function findSlots(config, date, timeZone) {
 }
 
 /**
- * @param config
- * @param slot
- * @param displayName
- * @param email
- * @param description
- * @param timeZone
+ * @param {object} config the appointment config object
+ * @param {object} slot the selected availability slot to book
+ * @param {string} displayName display name of the person booking the slot
+ * @param {string} email email address of the person booking the slot
+ * @param {string} description description for the booked appointment
+ * @param {string} timeZone time zone the slot was selected in
  */
 export async function bookSlot(config, slot, displayName, email, description, timeZone) {
 	const url = generateUrl('/apps/calendar/appointment/{token}/book', {
diff --git a/src/services/attachmentService.js b/src/services/attachmentService.js
index 7119ba959f..3e81c89a7e 100644
--- a/src/services/attachmentService.js
+++ b/src/services/attachmentService.js
@@ -40,9 +40,9 @@ async function shareFile(path) {
 /**
  * Share file with a user with permissions
  *
- * @param path
- * @param sharedWith
- * @param permissions
+ * @param {string} path The file path from the user's root directory. e.g. `/myfile.txt`
+ * @param {string} sharedWith The user id to share the file with
+ * @param {number} permissions The share permissions bitmask
  * @return {Promise<[{path: string, permissions, scope: string, name: string, backend: string, type: string},{path: string, permissions: *, scope: string, name: string, backend: string, type: string}]>}
  */
 async function shareFileWith(path, sharedWith, permissions = 17) {
diff --git a/src/services/attendeeDetails.js b/src/services/attendeeDetails.js
index f61ca9a788..6bdb0defed 100644
--- a/src/services/attendeeDetails.js
+++ b/src/services/attendeeDetails.js
@@ -11,7 +11,7 @@ import logger from '@/utils/logger.js'
 
 /**
  *
- * @param email {string} email of nextcloud user or contact
+ * @param {string} email email of nextcloud user or contact
  */
 export async function getAttendeeDetails(email) {
 	const allDetails = JSON.parse(localStorage.getItem('calendar-attendee-details') || '[]')
@@ -61,9 +61,9 @@ export async function getAttendeeDetails(email) {
 
 /**
  *
- * @param allDetails all the localstorage information
- * @param email attendee email
- * @param timezone fetched attendee timezone
+ * @param {object[]} allDetails all the localstorage information
+ * @param {string} email attendee email
+ * @param {string} timezone fetched attendee timezone
  */
 function generateDetails(allDetails, email, timezone) {
 	const newAttendeeDetails = {
@@ -87,8 +87,8 @@ function generateDetails(allDetails, email, timezone) {
 
 /**
  *
- * @param startDate starting date of event
- * @param timezone timezone of attendee
+ * @param {Date|string} startDate starting date of event
+ * @param {string} timezone timezone of attendee
  */
 export function adjustAttendeeTime(startDate, timezone) {
 	if (!timezone || !startDate) {
diff --git a/src/services/caldavService.js b/src/services/caldavService.js
index a61defe695..d3bf0996e6 100644
--- a/src/services/caldavService.js
+++ b/src/services/caldavService.js
@@ -44,7 +44,7 @@ async function initializeClientForPublicView() {
 /**
  * Fetch all calendars from the server
  *
- * @param {object} headers
+ * @param {object} headers Additional headers to send with the request
  * @return {Promise<CalendarHome>}
  */
 const getCalendarHome = (headers) => getClient(headers).calendarHomes[0]
diff --git a/src/services/freeBusySlotService.js b/src/services/freeBusySlotService.js
index e61e022f36..3476b659dd 100644
--- a/src/services/freeBusySlotService.js
+++ b/src/services/freeBusySlotService.js
@@ -18,7 +18,7 @@ const daysToSearch = 7
  * @param {AttendeeProperty[]} attendees Array of the event's attendees
  * @param {Date} start The start date and time of the event
  * @param {Date} end The end date and time of the event
- * @param timeZoneId
+ * @param {string} timeZoneId The time zone id to interpret start and end in
  * @param {boolean} bulk fetch all attendees in one request
  * @return {Promise<>}
  */
@@ -73,7 +73,7 @@ export async function getBusySlots(organizer, attendees, start, end, timeZoneId,
  *
  * @param {Date} start The start date and time of the event
  * @param {Date} end The end date and time of the event
- * @param retrievedEvents Events found by the freebusy API
+ * @param {object[]} retrievedEvents Events found by the freebusy API
  * @return []
  */
 export function getFirstFreeSlot(start, end, retrievedEvents) {
@@ -120,6 +120,8 @@ export function getFirstFreeSlot(start, end, retrievedEvents) {
 }
 
 /**
+ * @param {Date|string} start The start date and time
+ * @param {Date|string} end The end date and time
  * @return {number}
  */
 function getDurationInSeconds(start, end) {
diff --git a/src/services/timezoneOffsetService.ts b/src/services/timezoneOffsetService.ts
index 0852fc2aaf..446a1ae514 100644
--- a/src/services/timezoneOffsetService.ts
+++ b/src/services/timezoneOffsetService.ts
@@ -2,6 +2,14 @@
  * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
+
+/**
+ * Get the offset in minutes between a date's timezone and the given timezone
+ *
+ * @param proposalDate The date to compute the offset for
+ * @param timezoneId The timezone id to compute the offset against
+ * @return The offset in minutes
+ */
 export function getTimezoneOffset(proposalDate: Date, timezoneId: string): number {
 	let timezoneOffset = 0
 
diff --git a/src/store/calendarObjectInstance.js b/src/store/calendarObjectInstance.js
index 317f749550..f73c7325df 100644
--- a/src/store/calendarObjectInstance.js
+++ b/src/store/calendarObjectInstance.js
@@ -1143,6 +1143,7 @@ export default defineStore('calendarObjectInstance', {
 		 * @param {object} data.calendarObjectInstance The calendarObjectInstance object
 		 * @param {string} data.type Type of alarm
 		 * @param {number} data.totalSeconds Total amount of seconds for new alarm
+		 * @param {boolean=} data.isDefault Whether this is the default alarm
 		 */
 		addAlarmToCalendarObjectInstance({
 			calendarObjectInstance,
@@ -1203,10 +1204,9 @@ export default defineStore('calendarObjectInstance', {
 
 		/**
 		 * @deprecated
-		 * @param calendarObjectInstance.calendarObjectInstance
-		 * @param calendarObjectInstance
-		 * @param calendarObjectInstance.sharedData
-		 * @param sharedData
+		 * @param {object} data The destructuring object
+		 * @param {object} data.calendarObjectInstance The calendarObjectInstance object
+		 * @param {object} data.sharedData The shared file data to attach
 		 */
 		addAttachmentBySharedData({
 			calendarObjectInstance,
@@ -1245,10 +1245,9 @@ export default defineStore('calendarObjectInstance', {
 
 		/**
 		 *
-		 * @param calendarObjectInstance.calendarObjectInstance
-		 * @param calendarObjectInstance
-		 * @param sharedData
-		 * @param calendarObjectInstance.sharedData
+		 * @param {object} data The destructuring object
+		 * @param {object} data.calendarObjectInstance The calendarObjectInstance object
+		 * @param {object} data.sharedData The shared file data to attach
 		 */
 		addAttachmentWithProperty({
 			calendarObjectInstance,
@@ -1594,7 +1593,7 @@ export default defineStore('calendarObjectInstance', {
 		 * @param {object} data.calendarObjectInstance The calendarObjectInstance object
 		 * @param {Date} data.startDate The new start-date
 		 * @param {boolean} data.onlyTime Only update time
-		 * @param data.changeEndDate
+		 * @param {boolean=} data.changeEndDate Whether to also shift the end-date to preserve the duration
 		 */
 		changeStartDate({
 			calendarObjectInstance,
@@ -1894,8 +1893,8 @@ export default defineStore('calendarObjectInstance', {
 		/**
 		 *
 		 * @param {object} data The destructuring object for data
+		 * @param {object} data.calendarObjectInstance The calendarObjectInstance object
 		 * @param {object} data.recurrenceRule The recurrenceRule object to modify
-		 * @param {string} data.byDay The new until to set
 		 */
 		enableRecurrenceLimitByUntil({
 			calendarObjectInstance,
diff --git a/src/store/delegation.ts b/src/store/delegation.ts
index 0035378257..d06ef8d381 100644
--- a/src/store/delegation.ts
+++ b/src/store/delegation.ts
@@ -126,8 +126,9 @@ export default defineStore('delegation', () => {
 	/**
 	 * Add a user as a delegate with the given permission level.
 	 *
-	 * @param principalUrl - Absolute URL of the principal to add
-	 * @param permission - The permission level to grant
+	 * @param data The destructuring object
+	 * @param data.principalUrl - Absolute URL of the principal to add
+	 * @param data.permission - The permission level to grant
 	 */
 	async function addDelegate({ principalUrl, permission = 'write' as 'write' | 'read' }): Promise<void> {
 		const principalsStore = usePrincipalsStore()
@@ -143,7 +144,8 @@ export default defineStore('delegation', () => {
 	/**
 	 * Remove a delegate from whichever proxy group(s) they are in.
 	 *
-	 * @param principalUrl - Absolute URL of the principal to remove
+	 * @param data The destructuring object
+	 * @param data.principalUrl - Absolute URL of the principal to remove
 	 */
 	async function removeDelegate({ principalUrl }: { principalUrl: string }): Promise<void> {
 		const principalsStore = usePrincipalsStore()
diff --git a/src/store/settings.js b/src/store/settings.js
index c9d20d42db..912ce21629 100644
--- a/src/store/settings.js
+++ b/src/store/settings.js
@@ -339,14 +339,14 @@ export default defineStore('settings', {
 		 * @param {boolean} data.talkEnabled Whether or not the talk app is enabled
 		 * @param {boolean} data.tasksEnabled Whether ot not the tasks app is enabled
 		 * @param {string} data.timezone The timezone to view the calendar in. Either an Olsen timezone or "automatic"
-		 * @param {boolean} data.hideEventExport
-		 * @param {string} data.forceEventAlarmType
+		 * @param {boolean} data.hideEventExport Whether or not to hide the event export option
+		 * @param {string} data.forceEventAlarmType Forces newly created alarms to be of this type
 		 * @param {boolean} data.disableAppointments Allow to disable the appointments feature
 		 * @param {boolean} data.tasksSidebar Enable the tasks sidebar for unscheduled tasks
-		 * @param {boolean} data.canSubscribeLink
+		 * @param {boolean} data.canSubscribeLink Whether or not the user can subscribe to calendars via link
 		 * @param {string} data.attachmentsFolder Default user's attachments folder
 		 * @param {boolean} data.showResources Show or hide the resources tab
-		 * @param {string} data.publicCalendars
+		 * @param {string} data.publicCalendars The list of public calendars configured by the administrator
 		 */
 		loadSettingsFromServer({ appVersion, eventLimit, firstRun, showWeekNumbers, showTasks, showWeekends, skipPopover, slotDuration, defaultReminder, defaultReminderPartDay, defaultReminderFullDay, talkEnabled, tasksEnabled, timezone, hideEventExport, forceEventAlarmType, disableAppointments, tasksSidebar, canSubscribeLink, attachmentsFolder, showResources, publicCalendars }) {
 			logInfo(`
diff --git a/src/store/unscheduledTasks.js b/src/store/unscheduledTasks.js
index c98ee408a5..89b6fb9770 100644
--- a/src/store/unscheduledTasks.js
+++ b/src/store/unscheduledTasks.js
@@ -47,8 +47,8 @@ export default defineStore('tasks', {
 		/**
 		 * Append a single task to the store
 		 *
-		 * @param calendarid calendar id of the task
-		 * @param task The task to append to the store
+		 * @param {string} calendarid calendar id of the task
+		 * @param {object} task The task to append to the store
 		 */
 		appendTask(calendarid, task) {
 			if (!this.map[calendarid]) {
@@ -66,8 +66,8 @@ export default defineStore('tasks', {
 		/**
 		 * Removes a single task from the store
 		 *
-		 * @param calendarid calendar id of the task
-		 * @param task The task to remove from the store
+		 * @param {string} calendarid calendar id of the task
+		 * @param {object} task The task to remove from the store
 		 */
 		removeTask(calendarid, task) {
 			if (!this.map[calendarid]) {
diff --git a/src/utils/alarms.js b/src/utils/alarms.js
index a007bd3ef0..5e7e0fbadc 100644
--- a/src/utils/alarms.js
+++ b/src/utils/alarms.js
@@ -296,7 +296,7 @@ export function getDefaultReminderForEvent({ calendar, isAllDay }) {
  *
  * https://www.rfc-editor.org/rfc/rfc5545#section-3.6.6
  *
- * @param {AbstractRecurringComponent} eventComponent
+ * @param {AbstractRecurringComponent} eventComponent The event component to propagate alarm data for
  */
 export function updateAlarms(eventComponent) {
 	for (const alarmComponent of eventComponent.getAlarmIterator()) {
diff --git a/src/utils/date.js b/src/utils/date.js
index baa06c48ab..4e81090fa7 100644
--- a/src/utils/date.js
+++ b/src/utils/date.js
@@ -106,7 +106,7 @@ export function getDateFromDateTimeValue(dateTimeValue) {
  * @param {number} data.day Number of days to add
  * @param {number} data.week Number of weeks to add
  * @param {number} data.month Number of months to add
- * @param data.year
+ * @param {number} data.year Number of years to add
  * @return {Date}
  */
 export function modifyDate(date, { day = 0, week = 0, month = 0, year = 0 }) {
diff --git a/src/utils/localeTime.js b/src/utils/localeTime.js
index e05f7afceb..527b70c392 100644
--- a/src/utils/localeTime.js
+++ b/src/utils/localeTime.js
@@ -18,8 +18,8 @@ const locale = [getCanonicalLocale(), undefined].find((locale) => {
 /**
  * Format a time stamp as local time
  *
- * @param timeStamp {Number} unix times stamp in seconds
- * @param timeZoneId {string} IANA time zone identifier
+ * @param {number} timeStamp unix times stamp in seconds
+ * @param {string} timeZoneId IANA time zone identifier
  * @return {string} the formatted time
  */
 export function timeStampToLocaleTime(timeStamp, timeZoneId) {
@@ -33,8 +33,8 @@ export function timeStampToLocaleTime(timeStamp, timeZoneId) {
 /**
  * Format a time stamp as local date
  *
- * @param timeStamp {Number} unix times stamp in seconds
- * @param timeZoneId {string} IANA time zone identifier
+ * @param {number} timeStamp unix times stamp in seconds
+ * @param {string} timeZoneId IANA time zone identifier
  * @return {string} the formatted date
  */
 export function timeStampToLocaleDate(timeStamp, timeZoneId) {
diff --git a/src/utils/nextcloudVersion.ts b/src/utils/nextcloudVersion.ts
index b41ae10945..e9090db182 100644
--- a/src/utils/nextcloudVersion.ts
+++ b/src/utils/nextcloudVersion.ts
@@ -15,6 +15,7 @@ export function getNextcloudVersion(): number {
 /**
  * Whether the current Nextcloud version is equal or higher than the given version
  *
+ * @param version The major version number to compare against
  * @return True if supported
  */
 export function isAfterVersion(version: number): boolean {
diff --git a/src/utils/propfindErrorParse.js b/src/utils/propfindErrorParse.js
index 6d857ec65f..32f8e2be3f 100644
--- a/src/utils/propfindErrorParse.js
+++ b/src/utils/propfindErrorParse.js
@@ -9,7 +9,7 @@ import logger from '@/utils/logger.js'
 /**
  * Parse PROPFIND error when uploading a file and return a readable message.
  *
- * @param exception the error object
+ * @param {Error} exception the error object
  */
 async function parseUploadError(exception) {
 	try {
diff --git a/src/views/EditSimple.vue b/src/views/EditSimple.vue
index a6626a53b8..e379783036 100644
--- a/src/views/EditSimple.vue
+++ b/src/views/EditSimple.vue
@@ -665,6 +665,8 @@ export default {
 
 		/**
 		 * Calculate the popover position based on target element
+		 *
+		 * @param {Element} targetElement The element to position the popover relative to
 		 */
 		calculateAndApplyPosition(targetElement) {
 			const SPACING = 16