diff --git a/test-scripts/mxl2xml.js b/test-scripts/mxl2xml.js
index 34af2c6..a44ce0b 100644
--- a/test-scripts/mxl2xml.js
+++ b/test-scripts/mxl2xml.js
@@ -21,12 +21,9 @@ catch (e) {
 }
 
 (async function() {
-  try {
-    data = await MXML.unzip(data);
-  }
-  catch (e) {
+  data = await MXML.unzip(data);
+  if (!data) {
     console.error('Cannot uncompress file:', input);
-    console.error(e.message);
     process.exit(1);
   }
   try {
diff --git a/test-scripts/xml2midi.js b/test-scripts/xml2midi.js
new file mode 100644
index 0000000..d82c877
--- /dev/null
+++ b/test-scripts/xml2midi.js
@@ -0,0 +1,43 @@
+#!/usr/bin/env node
+const fs = require('fs');
+const MXML = require('../jazz-mxml');
+
+if (process.argv.length < 3) {
+  console.log('Usage: ' + process.argv[1].split(/[\\/]/).slice(-1) + ' <input> [<output>]');
+  process.exit(0);
+}
+
+const input = process.argv[2];
+const output = process.argv[3];
+
+var data;
+try {
+  data = fs.readFileSync(input);
+}
+catch (e) {
+  console.error('Cannot read file:', input);
+  console.error(e.message);
+  process.exit(1);
+}
+
+(async function() {
+  var xml = new MXML(MXML.zipInfo(data) ? await MXML.unzip(data) : new TextDecoder().decode(data));
+  if (!xml.isPartwise() && !xml.isTimewise()) {
+    console.error('Not a valid MusicXML file:', input);
+    process.exit(1);
+  }
+  data = xml.midi();
+  if (!data) {
+    console.error('Cannot generate MIDI');
+    process.exit(1);
+  }
+  try {
+    if (output) fs.writeFileSync(output, data.dump());
+    else console.log(data.toString());
+  }
+  catch (e) {
+    console.error('Cannot write file:', output);
+    console.error(e.message);
+    process.exit(1);
+  }
+})();
diff --git a/test-scripts/xml2mxl.js b/test-scripts/xml2mxl.js
index 0600d25..6481aca 100644
--- a/test-scripts/xml2mxl.js
+++ b/test-scripts/xml2mxl.js
@@ -27,12 +27,9 @@ if (!xml.isPartwise() && !xml.isTimewise() && !xml.isOpus()) {
 }
 
 (async function() {
-  try {
-    data = await MXML.zip(new TextEncoder().encode(data));
-  }
-  catch (e) {
+  data = await MXML.zip(new TextEncoder().encode(data));
+  if (!data) {
     console.error('Cannot uncompress file:', input);
-    console.error(e.message);
     process.exit(1);
   }
   try {