diff --git a/cli.mjs b/cli.mjs
new file mode 100755
index 0000000..293b9e8
--- /dev/null
+++ b/cli.mjs
@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+
+import {readFile} from 'node:fs/promises';
+import { gronReadStream } from './ngronstream.mjs';
+
+const main = async (args) => {
+  if (args.length === 0) {
+    process.stderr.write(`Usage: ngron [filename]\n`);
+    process.exit(1);
+  }
+  const content = await readFile(args[0], {encoding: 'utf8'});
+  const json = JSON.parse(content);
+  gronReadStream(json).pipe(process.stdout);
+
+}
+
+main(process.argv.slice(2));