diff --git a/basic/backend/java/src/main/java/io/openvidu/basic/java/Controller.java b/basic/backend/java/src/main/java/io/openvidu/basic/java/Controller.java
index 6740b0d3..7e7e2661 100644
--- a/basic/backend/java/src/main/java/io/openvidu/basic/java/Controller.java
+++ b/basic/backend/java/src/main/java/io/openvidu/basic/java/Controller.java
@@ -25,13 +25,16 @@ public class Controller {
 	 * @param params JSON object with roomName and participantName
 	 * @return The JWT token
 	 */
-	@PostMapping("/token")
+	@PostMapping(
+		value = "/token",
+		produces = "application/json"
+	)
 	public ResponseEntity<String> getToken(@RequestBody Map<String, String> params) {
 		String roomName = params.get("roomName");
 		String participantName = params.get("participantName");
 
 		if (roomName == null || participantName == null) {
-			return ResponseEntity.badRequest().body("roomName and participantName are required");
+			return ResponseEntity.badRequest().body("\"roomName and participantName are required\"");
 		}
 
 		AccessToken token = new AccessToken(LIVEKIT_API_KEY, LIVEKIT_API_SECRET);
@@ -39,7 +42,7 @@ public class Controller {
 		token.setIdentity(participantName);
 		token.addGrants(new RoomJoin(true), new RoomName(roomName));
 
-		return ResponseEntity.ok(token.toJwt());
+		return ResponseEntity.ok("\"" + token.toJwt() + "\"");
 	}
 
 }
diff --git a/basic/backend/node/index.js b/basic/backend/node/index.js
index db377601..cf63a869 100644
--- a/basic/backend/node/index.js
+++ b/basic/backend/node/index.js
@@ -17,18 +17,18 @@ app.post("/token", async (req, res) => {
     const participantName = req.body.participantName;
 
     if (!roomName || !participantName) {
-        res.status(400).send("roomName and participantName are required");
+        res.status(400).json("roomName and participantName are required");
         return;
     }
 
     const at = new AccessToken(LIVEKIT_API_KEY, LIVEKIT_API_SECRET, {
-        identity: participantName,
+        identity: participantName
     });
     at.addGrant({ roomJoin: true, room: roomName });
     const token = await at.toJwt();
-    res.send(token);
+    res.json(token);
 });
 
 app.listen(SERVER_PORT, () => {
-    console.log("Application started on port: ", SERVER_PORT);
+    console.log("Server started on port:", SERVER_PORT);
 });
diff --git a/basic/backend/php/index.php b/basic/backend/php/index.php
index b5388a8b..4277da45 100644
--- a/basic/backend/php/index.php
+++ b/basic/backend/php/index.php
@@ -1,5 +1,5 @@
 <?php
-require __DIR__ . '/vendor/autoload.php';
+require __DIR__ . "/vendor/autoload.php";
 
 use Agence104\LiveKit\AccessToken;
 use Agence104\LiveKit\AccessTokenOptions;
@@ -14,18 +14,18 @@ header("Access-Control-Allow-Methods: OPTIONS,GET,POST,PUT,DELETE");
 header("Access-Control-Max-Age: 3600");
 header("Access-Control-Allow-Headers: Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With");
 
-$LIVEKIT_API_KEY = $_ENV['LIVEKIT_API_KEY'] ?? 'devkey';
-$LIVEKIT_API_SECRET = $_ENV['LIVEKIT_API_SECRET'] ?? 'secret';
+$LIVEKIT_API_KEY = $_ENV["LIVEKIT_API_KEY"] ?? "devkey";
+$LIVEKIT_API_SECRET = $_ENV["LIVEKIT_API_SECRET"] ?? "secret";
 
-if ($_SERVER['REQUEST_METHOD'] === 'POST' && $_SERVER['PATH_INFO'] === '/token') {
-    $data = json_decode(file_get_contents('php://input'), true);
+if ($_SERVER["REQUEST_METHOD"] === "POST" && $_SERVER["PATH_INFO"] === "/token") {
+    $data = json_decode(file_get_contents("php://input"), true);
 
-    $roomName = $data['roomName'] ?? null;
-    $participantName = $data['participantName'] ?? null;
+    $roomName = $data["roomName"] ?? null;
+    $participantName = $data["participantName"] ?? null;
 
     if (!$roomName || !$participantName) {
         http_response_code(400);
-        echo "roomName and participantName are required";
+        echo json_encode("roomName and participantName are required");
         exit();
     }
 
@@ -39,9 +39,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && $_SERVER['PATH_INFO'] === '/token')
         ->setGrant($videoGrant)
         ->toJwt();
     
-    echo $token;
+    echo json_encode($token);
     exit();
 }
 
-echo "Unsupported endpoint or method";
+echo json_encode("Unsupported endpoint or method");
 exit();
diff --git a/basic/backend/python/app.py b/basic/backend/python/app.py
index e757746d..64f385d8 100644
--- a/basic/backend/python/app.py
+++ b/basic/backend/python/app.py
@@ -1,5 +1,5 @@
 import os
-from flask import Flask, request
+from flask import Flask, request, jsonify
 from flask_cors import CORS
 from dotenv import load_dotenv
 from livekit import api
@@ -20,7 +20,7 @@ def getToken():
     participant_name = request.json.get("participantName")
 
     if not room_name or not participant_name:
-        return "roomName and participantName are required", 400
+        return jsonify("roomName and participantName are required"), 400
 
     token = api.AccessToken(LIVEKIT_API_KEY, LIVEKIT_API_SECRET) \
         .with_identity(participant_name) \
@@ -28,7 +28,7 @@ def getToken():
             room_join=True,
             room=room_name
         ))
-    return token.to_jwt()
+    return jsonify(token.to_jwt())
 
 if __name__ == "__main__":
     app.run(debug=True, host="0.0.0.0", port=SERVER_PORT)
diff --git a/basic/backend/ruby/app.rb b/basic/backend/ruby/app.rb
index 554ba527..e2c24fa0 100644
--- a/basic/backend/ruby/app.rb
+++ b/basic/backend/ruby/app.rb
@@ -1,11 +1,11 @@
-require 'sinatra'
-require 'sinatra/cors'
-require 'livekit'
-require './env.rb'
+require "sinatra"
+require "sinatra/cors"
+require "livekit"
+require "./env.rb"
 
-SERVER_PORT = ENV['SERVER_PORT'] || 6080
-LIVEKIT_API_KEY = ENV['LIVEKIT_API_KEY'] || 'devkey'
-LIVEKIT_API_SECRET = ENV['LIVEKIT_API_SECRET'] || 'secret'
+SERVER_PORT = ENV["SERVER_PORT"] || 6080
+LIVEKIT_API_KEY = ENV["LIVEKIT_API_KEY"] || "devkey"
+LIVEKIT_API_SECRET = ENV["LIVEKIT_API_SECRET"] || "secret"
 
 set :port, SERVER_PORT
 
@@ -14,21 +14,21 @@ set :allow_origin, "*"
 set :allow_methods, "POST,OPTIONS"
 set :allow_headers, "content-type"
 
-post '/token' do
+post "/token" do
   content_type :json
 
   body = JSON.parse(request.body.read)
-  room_name = body['roomName']
-  participant_name = body['participantName']
+  room_name = body["roomName"]
+  participant_name = body["participantName"]
 
   if room_name.nil? || participant_name.nil?
     status 400
-    return 'roomName and participantName are required'
+    return JSON.generate("roomName and participantName are required")
   end
 
   token = LiveKit::AccessToken.new(api_key: LIVEKIT_API_KEY, api_secret: LIVEKIT_API_SECRET)
   token.identity = participant_name
   token.add_grant(roomJoin: true, room: room_name)
 
-  return token.to_jwt
+  return JSON.generate(token.to_jwt)
 end