Add JSON.stringify snippets

.vim/snips/javascript.snippets

@@ -2,3 +2,16 @@ snippet clg "console.log"
 console.log($0)
 endsnippet
 
+snippet Js "JSON.stringify"
+JSON.stringify($0)
+endsnippet
+
+snippet Jsf "JSON.stringify (formatted)"
+JSON.stringify($0, 0, 2)
+endsnippet
+
+snippet preJsf "JSON.stringify (formatted and wrapped)"
+<pre>
+  JSON.stringify($0, 0, 2)
+</pre>
+endsnippet