In-browser JSON editor

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JavaScript

Hulk

Hulk is an in-browser JSON editor. View an example

Usage

$.hulk('#selector', {foo: "bar"}, function(data) {
    console.log("Here's the updated data: " + data);
});

Will insert the JSON editor into the div with id “selector”. Generally ID’s are
preferred.

The third argument is a callback that will execute when the user presses “Save”.
Alternatively, you can retrieve the state of the world at any point by calling:

$.hulkSmash('#selector');

There are two CSS files, hulk.css and hulk-colors.css, which make the layout
much more readable. Of course, you are happy to style the inputs however you
desire.

Argument documentation

The $.hulk function takes the following arguments in this order:

  • selector (string) - Any valid jQuery selector. The input nodes will be
    inserted into the DOM based on the selector you give. This argument is required.

  • data (object) - Any valid JSON object. This will be serialized and splayed
    into the DOM. This argument is required.

  • callback (function) - When the user presses “Save” hulk will re-serialize
    the data and pass it as an argument to the function you provide. This argument
    is optional.

  • options (object) - A dictionary of optional settings for hulk. The
    possible options are outlined below. This argument is optional.

The $.hulkSmash function takes the following arguments in this order:

  • selector (string) - Any valid jQuery selector. The input nodes will be
    inserted into the DOM based on the selector you give. This argument is required.

  • options (object) - A dictionary of optional settings for hulk. The
    possible options are outlined below. This argument is optional.

Optional settings

These are options that you can pass to either $.hulk or $.hulkSmash.

  • separator (string) - Define a custom separator between keys and values. By
    default, the separator is “=>”.

  • emptyString (string) - Serialize an empty text input field back into JSON
    using the empty string ("") instead of null. Defaults to false.

  • depth (int) - Collapse all dictionaries and lists that are nested deeper
    than depth. depth=0 will collapse everything. depth=-1 will expand
    everything. The default is to show all JSON.

  • smartParsing (boolean) - Try to parse text inputs into matching data
    types, eg turn the string “5.53” into the number 5.53 when serializing into
    JSON, and turn “true” into true. If set to false, all objects will be
    serialized as strings. The default is true.

  • showSaveButton (boolean) - Whether to show the “Save” button. The default
    is to show the button.

  • permissions (array of strings) - Define how customizable and editable the custom JSON
    dictionary is. For example, you may only want to update existing values, not add
    new objects. This takes a few different values

    • “all” - allow the user to edit everything. This is the default.
    • “values-only” - only allow the user to edit the leaf nodes. Keys cannot be
      added or modified.
    • “no-append” - User can edit keys and values, but can’t add or delete nodes
      from the object.

Why?

Editing raw JSON is error-prone and not friendly to non-technical people. This
makes it easy to edit and serialize JSON. This also makes it easy for
a programmer and a non-technical user to collaborate.

We also use this tool internally at Twilio to edit configuration
files.

Notes

  • Javascript objects do not maintain a sorted order. This means, when
    serializing an object from HTML to JSON, the keys will not be sorted. To
    maintain some semblance of order, keys are presented on the page in
    alphabetical order when serializing from JSON to HTML (this is something we
    can control). Consider sorting keys once they are received on the server or
    whichever sane language is dealing with your new JSON object.

  • There is inherent uncertainty in using text inputs for data entry. Does the
    entry “5.5” represent the number 5.5 or the string “5.5”? In this case we do
    some basic parsing.

    • if the value looks like a number, it’s converted to a number
    • if the value looks like a boolean (“true” or “false”), it’s converted to a boolean
    • if the value is empty, or the word “null”, it’s converted to the null value.

    That said, if you set the smartParsing option to false, all inputs will
    be serialized and returned as strings.

Installation

  1. Include the jQuery source on your page

  2. Include the hulk plugin.

  3. Call away