diff --git a/jsonschema/cli.py b/jsonschema/cli.py
index ab3335b27..6f09c7bec 100644
--- a/jsonschema/cli.py
+++ b/jsonschema/cli.py
@@ -22,6 +22,10 @@ def _json_file(path):
         return json.load(file)
 
 
+def _read_from_stdin(stdin):
+    return json.loads(stdin.read())
+
+
 parser = argparse.ArgumentParser(
     description="JSON Schema Validation CLI",
 )
@@ -76,15 +80,16 @@ def main(args=sys.argv[1:]):
     sys.exit(run(arguments=parse_args(args=args)))
 
 
-def run(arguments, stdout=sys.stdout, stderr=sys.stderr):
+def run(arguments, stdout=sys.stdout, stderr=sys.stderr, stdin=sys.stdin):
     error_format = arguments["error_format"]
     validator = arguments["validator"](schema=arguments["schema"])
 
     validator.check_schema(arguments["schema"])
 
     errored = False
-    for instance in arguments["instances"] or ():
+    for instance in arguments["instances"] or (_read_from_stdin(stdin),):
         for error in validator.iter_errors(instance):
             stderr.write(error_format.format(error=error))
             errored = True
+
     return errored
diff --git a/jsonschema/tests/test_cli.py b/jsonschema/tests/test_cli.py
index ed820ba3f..ed3b5c1ab 100644
--- a/jsonschema/tests/test_cli.py
+++ b/jsonschema/tests/test_cli.py
@@ -149,3 +149,20 @@ def test_version(self):
         )
         version = version.decode("utf-8").strip()
         self.assertEqual(version, __version__)
+
+    def test_piping(self):
+        stdout, stderr, stdin = NativeIO(), NativeIO(), NativeIO("{}")
+        exit_code = cli.run(
+            {
+                "validator": fake_validator(),
+                "schema": {},
+                "instances": [],
+                "error_format": "{error.message}",
+            },
+            stdout=stdout,
+            stderr=stderr,
+            stdin=stdin,
+        )
+        self.assertFalse(stdout.getvalue())
+        self.assertFalse(stderr.getvalue())
+        self.assertEqual(exit_code, 0)