Is a simple JSON editor with text and tree view. Complete application (single executable file) weights about 2 MB (statically linked Lua and Scintilla included), does not require installation and does not depend on any non-standard dll. Settings are stored in .ini file created in application directory, so you can call it portable.
http://tomeko.net/software/JSONedit/
origin - http://www.pipiscrew.com/?p=4901 jsonedit