diff --git a/src/components/AdminSettings/TurnServer.vue b/src/components/AdminSettings/TurnServer.vue
index 1c1db3d8b70..bc4d31d06d1 100644
--- a/src/components/AdminSettings/TurnServer.vue
+++ b/src/components/AdminSettings/TurnServer.vue
@@ -89,7 +89,7 @@ import NcPasswordField from '@nextcloud/vue/dist/Components/NcPasswordField.js'
 import NcSelect from '@nextcloud/vue/dist/Components/NcSelect.js'
 import NcTextField from '@nextcloud/vue/dist/Components/NcTextField.js'
 
-import { isCertificateValid } from '../../services/certificateService.js'
+import { isCertificateValid } from '../../services/certificateService.ts'
 
 export default {
 	name: 'TurnServer',
diff --git a/src/services/certificateService.js b/src/services/certificateService.js
deleted file mode 100644
index 5875e165a18..00000000000
--- a/src/services/certificateService.js
+++ /dev/null
@@ -1,53 +0,0 @@
-/**
- * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
- * SPDX-License-Identifier: AGPL-3.0-or-later
- */
-import axios from '@nextcloud/axios'
-import { generateOcsUrl } from '@nextcloud/router'
-
-/**
- * Retrieves the certificate expiration of the specified host
- *
- * @param {string} host The host to check the certificate
- * @return {number|null} Null if unable to retrieve the certificates expiration, otherwise the expiration in days (negative if already expired)
- */
-const getCertificateExpiration = async (host) => {
-	try {
-		const response = await axios.get(generateOcsUrl('apps/spreed/api/v1/certificate/expiration'), {
-			params: {
-				host,
-			},
-		})
-
-		return response.data.ocs.data.expiration_in_days
-	} catch (error) {
-		console.error(error)
-	}
-
-	return null
-}
-
-/**
- * Checks if the certificate of a host is valid
- *
- * @param {string} host The host to check the certificate
- * @return {boolean} true if the certificate is valid, false otherwise
- */
-const isCertificateValid = async (host) => {
-	const expiration = await getCertificateExpiration(host)
-
-	if (expiration == null) {
-		console.warn('Unable to check certificate of', host)
-	} else if (expiration < 0) {
-		console.error('Certificate of', host, 'expired')
-	} else {
-		console.info('Certificate of', host, 'is valid for', expiration, 'days')
-	}
-
-	return expiration > 0
-}
-
-export {
-	getCertificateExpiration,
-	isCertificateValid,
-}
diff --git a/src/services/certificateService.ts b/src/services/certificateService.ts
new file mode 100644
index 00000000000..e31726c7416
--- /dev/null
+++ b/src/services/certificateService.ts
@@ -0,0 +1,54 @@
+/**
+ * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+import axios from '@nextcloud/axios'
+import { generateOcsUrl } from '@nextcloud/router'
+
+import type { certificateExpirationParams, certificateExpirationResponse } from '../types/index.ts'
+
+/**
+ * Retrieves the certificate expiration of the specified host
+ *
+ * @param host The host to check the certificate
+ */
+const getCertificateExpiration = async (host: certificateExpirationParams['host']): certificateExpirationResponse => {
+	return axios.get(generateOcsUrl('apps/spreed/api/v1/certificate/expiration'), {
+		params: {
+			host,
+		} as certificateExpirationParams,
+	})
+}
+
+/**
+ * Checks if the certificate of a host is valid
+ *
+ * @param host The host to check the certificate
+ * @return {boolean} true if the certificate is valid, false otherwise
+ */
+const isCertificateValid = async (host: certificateExpirationParams['host']): Promise<boolean> => {
+	try {
+		const response = await getCertificateExpiration(host)
+
+		// Null if unable to retrieve the certificates expiration, otherwise the expiration in days (negative if already expired)
+		const expiration = response.data.ocs.data.expiration_in_days
+
+		if (expiration == null) {
+			console.warn('Unable to check certificate of', host)
+			return false
+		} else if (expiration < 0) {
+			console.error('Certificate of', host, 'expired')
+		} else {
+			console.info('Certificate of', host, 'is valid for', expiration, 'days')
+		}
+		return expiration > 0
+	} catch (error) {
+		console.error(error)
+		return false
+	}
+}
+
+export {
+	getCertificateExpiration,
+	isCertificateValid,
+}
diff --git a/src/types/index.ts b/src/types/index.ts
index 36b78b1558b..924ed5fa493 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -177,6 +177,10 @@ export type getBotsAdminResponse = ApiResponse<operations['bot-admin-list-bots']
 export type enableBotResponse = ApiResponse<operations['bot-enable-bot']['responses'][201]['content']['application/json']>
 export type disableBotResponse = ApiResponse<operations['bot-disable-bot']['responses'][200]['content']['application/json']>
 
+// Certificate
+export type certificateExpirationParams = operations['certificate-get-certificate-expiration']['parameters']['query']
+export type certificateExpirationResponse = ApiResponse<operations['certificate-get-certificate-expiration']['responses'][200]['content']['application/json']>
+
 // Federations
 export type FederationInvite = components['schemas']['FederationInvite']
 type FederationInviteRichParameters = {