diff --git a/core/src/main/scala/scommons/nodejs/FS.scala b/core/src/main/scala/scommons/nodejs/FS.scala
index f99c552..b4a0999 100644
--- a/core/src/main/scala/scommons/nodejs/FS.scala
+++ b/core/src/main/scala/scommons/nodejs/FS.scala
@@ -26,6 +26,15 @@ trait FS {
     p.future
   }
 
+  def ftruncate(fd: Int, len: Double): Future[Unit] = {
+    val p = Promise[Unit]()
+    raw.FS.ftruncate(fd, len, { error =>
+      if (error != null && !js.isUndefined(error)) p.failure(js.JavaScriptException(error))
+      else p.success(())
+    })
+    p.future
+  }
+
   def openSync(path: String, flags: Int): Int = raw.FS.openSync(path, flags)
   
   def closeSync(fd: Int): Unit = raw.FS.closeSync(fd)
diff --git a/core/src/main/scala/scommons/nodejs/raw/FS.scala b/core/src/main/scala/scommons/nodejs/raw/FS.scala
index 5f62fb5..456d54d 100644
--- a/core/src/main/scala/scommons/nodejs/raw/FS.scala
+++ b/core/src/main/scala/scommons/nodejs/raw/FS.scala
@@ -16,6 +16,8 @@ object FS extends js.Object {
   
   def rename(oldPath: String | URL, newPath: String | URL, callback: js.Function1[js.Error, Unit]): Unit = js.native
 
+  def ftruncate(fd: Int, len: Double, callback: js.Function1[js.Error, Unit]): Unit = js.native
+
   def openSync(path: String | URL, flags: Int): Int = js.native
 
   def closeSync(fd: Int): Unit = js.native
diff --git a/showcase/src/test/scala/scommons/nodejs/FSSpec.scala b/showcase/src/test/scala/scommons/nodejs/FSSpec.scala
index 3917894..8f40539 100644
--- a/showcase/src/test/scala/scommons/nodejs/FSSpec.scala
+++ b/showcase/src/test/scala/scommons/nodejs/FSSpec.scala
@@ -5,11 +5,11 @@ import scommons.nodejs.raw.FSConstants._
 import scommons.nodejs.raw.{FSConstants, FileOptions}
 import scommons.nodejs.test.AsyncTestSpec
 
+import scala.Ordering.Double.IeeeOrdering
 import scala.concurrent.Future
 import scala.scalajs.js
 import scala.scalajs.js.JavaScriptException
 import scala.scalajs.js.typedarray.Uint8Array
-import scala.Ordering.Double.IeeeOrdering
 
 class FSSpec extends AsyncTestSpec {
 
@@ -95,6 +95,57 @@ class FSSpec extends AsyncTestSpec {
     }
   }
 
+  it should "fail if invalid fd when ftruncate" in {
+    //given
+    val tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "scommons-nodejs-"))
+    val file = path.join(tmpDir, "example.txt")
+    fs.writeFileSync(file, "hello, World!!!")
+    val fd = fs.openSync(file, FSConstants.O_WRONLY)
+    fs.closeSync(fd)
+
+    //when
+    val result = fs.ftruncate(fd, 5)
+
+    //then
+    result.failed.map {
+      case JavaScriptException(error) =>
+        error.toString should include ("EBADF: bad file descriptor")
+    }.andThen {
+      case _ =>
+        //cleanup
+        fs.unlinkSync(file)
+        fs.rmdirSync(tmpDir)
+    }
+  }
+
+  it should "truncate file when ftruncate" in {
+    //given
+    val tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "scommons-nodejs-"))
+    val file = path.join(tmpDir, "example.txt")
+    fs.writeFileSync(file, "hello, World!!!")
+    fs.readFileSync(file, new FileOptions {
+      override val encoding = "utf8"
+    }) shouldBe "hello, World!!!"
+    val fd = fs.openSync(file, FSConstants.O_WRONLY)
+
+    //when
+    val result = fs.ftruncate(fd, 5)
+
+    //then
+    result.map { _ =>
+      fs.closeSync(fd)
+      fs.lstatSync(file).size shouldBe 5
+      fs.readFileSync(file, new FileOptions {
+        override val encoding = "utf8"
+      }) shouldBe "hello"
+    }.andThen {
+      case _ =>
+        //cleanup
+        fs.unlinkSync(file)
+        fs.rmdirSync(tmpDir)
+    }
+  }
+
   it should "return stats when lstatSync" in {
     //when
     val stats = fs.lstatSync(os.homedir())