[jquery] GUI-based or Web-based JSON editor that works like property explorer

Background: This is a request for something that may not exist yet, but I've been meaning to build one for a long time. First I will ask if anyone has seen anything like it yet.

Suppose you have an arbitrary JSON structure like the following:

{
    'title_str':'My Employee List'
    ,'lastmod_str': '2009-June-15'
    ,'employee_table':[
        {'firstname':'john','lastname':'doe','age':'33',}
        ,{'firstname':'jane','lastname':'doe','age':'34',}
        ,{'firstname':'samuel','lastname':'doe','age':'35',}
    ]
}

Question: Is there a web-based JSON editor that could take a structure like this, and automatically allow the user to modify this in a user-friendly GUI?

Example: Imagine an auto-generated HTML form that displays 2 input-type-text controls for both title and lastmod, and a table of input-type-text controls with three columns and three rows for arr_list ... with the ability to delete or add additional rows by clicking on a [+][X] next to each row in the table.

Big Idea: The "big idea" behind this is that the user would be able to specify any arbitrary (non-recursive) JSON structure and then also be able to edit the structure with a GUI-based interaction (this would be similar to the "XML Editor Grid View" in XML Spy).

See also:

• Is there a JSON api based CMS that is hosted locally?
• https://ux.stackexchange.com/questions/37237/treetable-as-a-flexible-condition-filter-editor
• YAML GUI

Update: (Thu 2014-07-31 18:31:11)

A github repository has been created to further track this closed SO post.

• https://github.com/dreftymac/stackoverflow.questions.998832

Generally when I want to create a JSON or YAML string, I start out by building the Perl data structure, and then running a simple conversion on it. You could put a UI in front of the Perl data structure generation, e.g. a web form.

Converting a structure to JSON is very straightforward:

use strict;
use warnings;
use JSON::Any;

my $data = { arbitrary structure in here };
my $json_handler = JSON::Any->new(utf8=>1);
my $json_string = $json_handler->objToJson($data);