diff --git a/server.js b/server.js
index 8a3fe833c..f95226f7d 100644
--- a/server.js
+++ b/server.js
@@ -248,28 +248,41 @@ app.use(compression());
 app.use(responseTime());
 
 
+/** @type {number} */
 const server_port = cliArguments.port ?? process.env.SILLY_TAVERN_PORT ?? getConfigValue('port', DEFAULT_PORT);
+/** @type {boolean} */
 const autorun = (cliArguments.autorun ?? getConfigValue('autorun', DEFAULT_AUTORUN)) && !cliArguments.ssl;
+/** @type {boolean} */
 const listen = cliArguments.listen ?? getConfigValue('listen', DEFAULT_LISTEN);
+/** @type {boolean} */
 const enableCorsProxy = cliArguments.corsProxy ?? getConfigValue('enableCorsProxy', DEFAULT_CORS_PROXY);
 const enableWhitelist = cliArguments.whitelist ?? getConfigValue('whitelistMode', DEFAULT_WHITELIST);
+/** @type {string} */
 const dataRoot = cliArguments.dataRoot ?? getConfigValue('dataRoot', './data');
+/** @type {boolean} */
 const disableCsrf = cliArguments.disableCsrf ?? getConfigValue('disableCsrfProtection', DEFAULT_CSRF_DISABLED);
 const basicAuthMode = cliArguments.basicAuthMode ?? getConfigValue('basicAuthMode', DEFAULT_BASIC_AUTH);
 const perUserBasicAuth = getConfigValue('perUserBasicAuth', DEFAULT_PER_USER_BASIC_AUTH);
+/** @type {boolean} */
 const enableAccounts = getConfigValue('enableUserAccounts', DEFAULT_ACCOUNTS);
 
 const uploadsPath = path.join(dataRoot, UPLOADS_DIRECTORY);
 
 
+/** @type {boolean|'auto'} */
 let enableIPv6 = stringToBool(cliArguments.enableIPv6) ?? getConfigValue('protocol.ipv6', DEFAULT_ENABLE_IPV6);
+/** @type {boolean|'auto'} */
 let enableIPv4 = stringToBool(cliArguments.enableIPv4) ?? getConfigValue('protocol.ipv4', DEFAULT_ENABLE_IPV4);
 
+/** @type {string} */
 const autorunHostname = cliArguments.autorunHostname ?? getConfigValue('autorunHostname', DEFAULT_AUTORUN_HOSTNAME);
+/** @type {number} */
 const autorunPortOverride = cliArguments.autorunPortOverride ?? getConfigValue('autorunPortOverride', DEFAULT_AUTORUN_PORT);
 
+/** @type {boolean} */
 const dnsPreferIPv6 = cliArguments.dnsPreferIPv6 ?? getConfigValue('dnsPreferIPv6', DEFAULT_PREFER_IPV6);
 
+/** @type {boolean} */
 const avoidLocalhost = cliArguments.avoidLocalhost ?? getConfigValue('avoidLocalhost', DEFAULT_AVOID_LOCALHOST);
 
 const proxyEnabled = cliArguments.requestProxyEnabled ?? getConfigValue('requestProxy.enabled', DEFAULT_PROXY_ENABLED);
diff --git a/src/util.js b/src/util.js
index 07422a7ef..72c1ae704 100644
--- a/src/util.js
+++ b/src/util.js
@@ -748,8 +748,8 @@ export async function canResolve(name, useIPv6 = true, useIPv4 = true) {
 
 /**
  * converts string to boolean accepts 'true' or 'false' else it returns the string put in
- * @param {string} str Input string
- * @returns {boolean|string} boolean else original input string
+ * @param {string|null} str Input string or null
+ * @returns {boolean|string|null} boolean else original input string or null if input is
  */
 export function stringToBool(str) {
     if (str === 'true') return true;