diff --git a/examples/js/express/mysql/endpoints.yaml b/examples/js/express/mysql/endpoints.yaml
index afd5c01..7afd1f5 100644
--- a/examples/js/express/mysql/endpoints.yaml
+++ b/examples/js/express/mysql/endpoints.yaml
@@ -94,6 +94,10 @@
           type: integer
         hidden:
           type: boolean
+    params:
+      query:
+        hidden:
+          type: boolean
 
 - path: /v1/categories/:categoryId
   get:
diff --git a/examples/js/express/mysql/routes.js b/examples/js/express/mysql/routes.js
index 4943866..b8470fb 100644
--- a/examples/js/express/mysql/routes.js
+++ b/examples/js/express/mysql/routes.js
@@ -1,3 +1,7 @@
+const parseBoolean = (value) => {
+    return value === 'true'
+}
+
 const register = (app, pool) => {
 
     app.get('/v1/categories/count', (req, res, next) => {
@@ -61,7 +65,7 @@ const register = (app, pool) => {
     app.get('/v1/categories/search', (req, res, next) => {
         pool.query(
             'SELECT id , name , name_ru , slug , hidden FROM categories WHERE hidden = :hidden',
-            { "hidden": req.query.hidden },
+            { "hidden": parseBoolean(req.query.hidden) },
             (err, rows, fields) => {
                 if (err) {
                     return next(err)
diff --git a/src/cli.js b/src/cli.js
index f57ab40..d829a43 100755
--- a/src/cli.js
+++ b/src/cli.js
@@ -158,7 +158,7 @@ const lengthOfLongestString = (arr) => arr
 		)
 
 // returns user-defined variable's type or null
-// Accepts method.dto.fields fieldsInfo
+// Accepts method.dto.fields or method.params as fieldsInfo
 const retrieveType = (fieldsInfo, fieldName) => {
 	const hasTypeInfo = fieldsInfo.hasOwnProperty(fieldName) && fieldsInfo[fieldName].hasOwnProperty('type')
 	if (hasTypeInfo) {
@@ -235,7 +235,7 @@ const createEndpoints = async (destDir, { lang }, config) => {
             
             // [ "p.page", "b.num" ] => '"page": req.params.page, "num": req.body.num'
             // (used only with Express)
-            "formatParamsAsJavaScriptObject": (params) => {
+            "formatParamsAsJavaScriptObject": (params, method) => {
                 if (params.length === 0) {
                     return params
                 }
@@ -245,6 +245,10 @@ const createEndpoints = async (destDir, { lang }, config) => {
                             const bindTarget = p.substring(0, 1)
                             const paramName = p.substring(2)
                             const prefix = placeholdersMap['js'][bindTarget]
+                            // LATER: add support for path (method.params.path) and body (method.dto.fields) parameters
+                            if (method && bindTarget === 'q' && retrieveType(method.params.query, paramName) === 'boolean') {
+                                return `"${paramName}": parseBoolean(${prefix}.${paramName})`
+                            }
                             return `"${paramName}": ${prefix}.${paramName}`
                         }
                     ).join(', ')
diff --git a/src/templates/routes.js.ejs b/src/templates/routes.js.ejs
index 155867a..193ed77 100644
--- a/src/templates/routes.js.ejs
+++ b/src/templates/routes.js.ejs
@@ -1,3 +1,8 @@
+<%# LATER: add it only when there is at least one parameter of boolean type -%>
+const parseBoolean = (value) => {
+    return value === 'true'
+}
+
 const register = (app, pool) => {
 <%
 endpoints.forEach(function(endpoint) {
@@ -13,7 +18,7 @@ endpoints.forEach(function(endpoint) {
         const sql = formatQuery(method.query)
         const params = extractParamsFromQuery(method.query)
         const formattedParams = params.length > 0
-            ? '\n            { ' + formatParamsAsJavaScriptObject(params) + ' },'
+            ? '\n            { ' + formatParamsAsJavaScriptObject(params, method) + ' },'
             : ''
 
         if (hasGetOne || hasGetMany) {