Update:
As of Notepad++ v7.6, use Plugin Admin to install JSTool per this answer
INSTALL
Download it from http://sourceforge.net/projects/jsminnpp/ and copy JSMinNpp.dll to plugin directory of Notepad++. Or you can just install “JSTool” from Plugin Manager in Notepad++.
New Notepad++ install and where did PluginManager go? See How to view Plugin Manager in Notepad++
{
"menu" : {
"id" : "file",
"value" : "File",
"popup" : {
"menuitem" : [{
"value" : "New",
"onclick" : "CreateNewDoc()"
}, {
"value" : "Open",
"onclick" : "OpenDoc()"
}, {
"value" : "Close",
"onclick" : "CloseDoc()"
}
]
}
}
}
Tip: Select the code you want to reformat, then Plugins | JSTool | JSFormat.