diff --git a/projects/m4/003-concatenate-multiple-files/js/example1.txt b/projects/m4/003-concatenate-multiple-files/js/example1.txt
new file mode 100644
index 000000000..f894de28b
--- /dev/null
+++ b/projects/m4/003-concatenate-multiple-files/js/example1.txt
@@ -0,0 +1,6 @@
+Line 1: This is the first line.
+Line 2: This is the second line.
+Line 3: This is the third line.
+Line 4: This is the fourth line.
+Line 5: This is the fifth line.
+Line 6: This is the sixth line.
\ No newline at end of file
diff --git a/projects/m4/003-concatenate-multiple-files/js/example2.txt b/projects/m4/003-concatenate-multiple-files/js/example2.txt
new file mode 100644
index 000000000..297045564
--- /dev/null
+++ b/projects/m4/003-concatenate-multiple-files/js/example2.txt
@@ -0,0 +1,6 @@
+Line 7: This is the seventh line.
+Line 8: This is the eighth line.
+Line 9: This is the ninth line.
+Line 10: This is the tenth line.
+Line 11: This is the eleventh line.
+Line 12: This is the twelfth line.
\ No newline at end of file
diff --git a/projects/m4/003-concatenate-multiple-files/js/example3.txt b/projects/m4/003-concatenate-multiple-files/js/example3.txt
new file mode 100644
index 000000000..70fefbb94
--- /dev/null
+++ b/projects/m4/003-concatenate-multiple-files/js/example3.txt
@@ -0,0 +1,6 @@
+Line 13: This is the thirteenth line.
+Line 14: This is the fourteenth line.
+Line 15: This is the fifteenth line.
+Line 16: This is the sixteenth line.
+Line 17: This is the seventeenth line.
+Line 18: This is the eighteenth line.
diff --git a/projects/m4/003-concatenate-multiple-files/js/example4.txt b/projects/m4/003-concatenate-multiple-files/js/example4.txt
new file mode 100644
index 000000000..d546eef9f
--- /dev/null
+++ b/projects/m4/003-concatenate-multiple-files/js/example4.txt
@@ -0,0 +1,6 @@
+Line 19: This is the nineteenth line.
+Line 20: This is the twentieth line.
+Line 21: This is the twenty-first line.
+Line 22: This is the twenty-second line.
+Line 23: This is the twenty-third line.
+Line 24: This is the twenty-fourth line.
\ No newline at end of file
diff --git a/projects/m4/003-concatenate-multiple-files/js/index.js b/projects/m4/003-concatenate-multiple-files/js/index.js
index e69de29bb..5496ce1dc 100644
--- a/projects/m4/003-concatenate-multiple-files/js/index.js
+++ b/projects/m4/003-concatenate-multiple-files/js/index.js
@@ -0,0 +1,26 @@
+const { readFile } = require('fs/promises');
+
+let filePath1 = './example1.txt';
+let filePath2 = './example2.txt';
+let filePath3 = './example3.txt';
+let filePath4 = './example4.txt';
+
+Promise.all([
+    readFile(filePath1),
+    readFile(filePath2),
+    readFile(filePath3),
+    readFile(filePath4),
+])
+    .then((data1, data2, data3, data4) => {
+        console.log(
+            data1
+                .toString()
+                .split('\r\n')
+                .concat(data2, data3, data4)
+                .join('\r\n')
+        );
+    })
+    .catch((error) => {
+        console.log(`Il file non può essere visualizzato`);
+        console.error(error);
+    });