diff --git a/index.js b/index.js
index 9f2571b..ae4c8ee 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,7 @@
+var json = typeof JSON !== undefined ? JSON : require('jsonify');
+
 exports.quote = function (xs) {
-    return xs.map(function (s) {
+    return map(xs, function (s) {
         if (s && typeof s === 'object') {
             return s.op.replace(/(.)/g, '\\$1');
         }
@@ -31,13 +33,13 @@ for (var i = 0; i < 4; i++) {
 exports.parse = function (s, env) {
     var mapped = parse(s, env);
     if (typeof env !== 'function') return mapped;
-    return mapped.reduce(function (acc, s) {
+    return reduce(mapped, function (acc, s) {
         if (typeof s === 'object') return acc.concat(s);
         var xs = s.split(RegExp('(' + TOKEN + '.*?' + TOKEN + ')', 'g'));
         if (xs.length === 1) return acc.concat(xs[0]);
-        return acc.concat(xs.filter(Boolean).map(function (x) {
+        return acc.concat(map(filter(xs, Boolean), function (x) {
             if (RegExp('^' + TOKEN).test(x)) {
-                return JSON.parse(x.split(TOKEN)[1]);
+                return json.parse(x.split(TOKEN)[1]);
             }
             else return x;
         }));
@@ -49,11 +51,11 @@ function parse (s, env) {
         '(' + CONTROL + ')', // control chars
         '(' + BAREWORD + '|' + SINGLE_QUOTE + '|' + DOUBLE_QUOTE + ')*'
     ].join('|'), 'g');
-    var match = s.match(chunker).filter(Boolean);
+    var match = filter(s.match(chunker), Boolean);
     
     if (!match) return [];
     if (!env) env = {};
-    return match.map(function (s) {
+    return map(match, function (s) {
         if (RegExp('^' + CONTROL + '$').test(s)) {
             return { op: s };
         }
@@ -169,8 +171,34 @@ function parse (s, env) {
         if (r === undefined) r = '';
         
         if (typeof r === 'object') {
-            return pre + TOKEN + JSON.stringify(r) + TOKEN;
+            return pre + TOKEN + json.stringify(r) + TOKEN;
         }
         else return pre + r;
     }
 };
+
+function filter (xs, f) {
+    if (xs.filter) return xs.filter(f);
+    var res = [];
+    for (var i = 0; i < xs.length; i++) {
+        if (f(xs[i], i)) res.push(xs[i]);
+    }
+    return res;
+}
+
+function map (xs, f) {
+    if (xs.map) return xs.map(f);
+    var res = [];
+    for (var i = 0; i < xs.length; i++) {
+        res.push(f(xs[i], i));
+    }
+    return res;
+}
+
+function reduce (xs, f, acc) {
+    if (xs.reduce) return xs.reduce(f, acc);
+    for (var i = 0; i < xs.length; i++) {
+        acc = f(acc, xs[i], i);
+    }
+    return acc;
+}
diff --git a/package.json b/package.json
index b99282f..111da61 100644
--- a/package.json
+++ b/package.json
@@ -1,41 +1,48 @@
 {
-    "name" : "shell-quote",
-    "version" : "1.4.0",
-    "description" : "quote and parse shell commands",
-    "main" : "index.js",
-    "devDependencies" : {
-        "tape" : "~2.3.0"
-    },
-    "scripts" : {
-        "test" : "tape test/*.js"
-    },
-    "repository" : {
-        "type" : "git",
-        "url" : "http://github.com/substack/node-shell-quote.git"
-    },
-    "keywords" : [
-        "shell",
-        "command",
-        "quote",
-        "parse"
-    ],
-    "testling": {
-        "files": "test/*.js",
-        "browsers": [
-            "ie/6..latest",
-            "firefox/3.5", "firefox/15..latest", "firefox/nightly",
-            "chrome/25..latest", "chrome/canary",
-            "opera/10..latest", "opera/next",
-            "safari/5.1..latest",
-            "ipad/6.0..latest",
-            "iphone/6.0..latest",
-            "android-browser/4.2..latest"
-        ]
-    },
-    "author" : {
-        "name" : "James Halliday",
-        "email" : "mail@substack.net",
-        "url" : "http://substack.net"
-    },
-    "license" : "MIT"
+  "name": "shell-quote",
+  "version": "1.4.0",
+  "description": "quote and parse shell commands",
+  "main": "index.js",
+  "devDependencies": {
+    "tape": "~2.3.0"
+  },
+  "scripts": {
+    "test": "tape test/*.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "http://github.com/substack/node-shell-quote.git"
+  },
+  "keywords": [
+    "shell",
+    "command",
+    "quote",
+    "parse"
+  ],
+  "testling": {
+    "files": "test/*.js",
+    "browsers": [
+      "ie/6..latest",
+      "firefox/3.5",
+      "firefox/15..latest",
+      "firefox/nightly",
+      "chrome/25..latest",
+      "chrome/canary",
+      "opera/10..latest",
+      "opera/next",
+      "safari/5.1..latest",
+      "ipad/6.0..latest",
+      "iphone/6.0..latest",
+      "android-browser/4.2..latest"
+    ]
+  },
+  "author": {
+    "name": "James Halliday",
+    "email": "mail@substack.net",
+    "url": "http://substack.net"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "jsonify": "0.0.0"
+  }
 }