diff --git a/lib/cli.js b/lib/cli.js
index 7f0f5ef..7927ef9 100755
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -17,9 +17,13 @@ var options = require("nomnom")
         return JSON.parse(fs.readFileSync(__dirname + "/../package.json", "utf8")).version;
       }
     },
+    inplace : {
+      string: '-i, --in-place',
+      help: 'overwrite the file'
+    },
     indent : {
       string: '-t CHAR, --indent CHAR',
-      default: " ",
+      default: "  ",
       help: 'character(s) to use for indentation'
     }
   })
@@ -28,7 +32,7 @@ var options = require("nomnom")
 
 function parse (source) {
   try {
-    sys.puts(JSON.stringify(parser.parse(source),null,"  "));
+    return JSON.stringify(parser.parse(source),null,options.indent);
   } catch (e) {
     sys.puts(e);
     process.exit(1);
@@ -38,8 +42,13 @@ function parse (source) {
 function main (args) {
   var source = '';
   if (options.file) {
-    source = fs.readFileSync(require('path').join(process.cwd(), options.file), "utf8");
-    parse(source);
+    var path = require('path').join(process.cwd(), options.file); 
+    source = fs.readFileSync(path, "utf8");
+    if (options.inplace) {
+      fs.writeSync(fs.openSync(path,'w+'), parse(source), 0, "utf8");
+    } else {
+      sys.pupts(parse(source));
+    }
   } else {
     var stdin = process.openStdin();
     stdin.setEncoding('utf8');
@@ -48,7 +57,7 @@ function main (args) {
       source += chunk.toString('utf8');
     });
     stdin.on('end', function () {
-      parse(source);
+      sys.puts(parse(source));
     });
   }
 }