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# API Reference
## JSONEditor
### Constructor
#### `JSONEditor(container [, options] [, json])`
Constructs a new JSONEditor.
*Parameters:*
- `{Element} container`
An HTML DIV element. The JSONEditor will be created inside this container element.
- `{Object} options`
Optional object with options. Available options:
- `{function} change`
Set a callback method triggered when the contents of the JSONEditor change. Called without parameters.
- `{function} editable`
Set a callback method to determine whether individual nodes are editable or read-only. Only applicable when option `mode` is `tree`. The callback is invoked as `editable(node)`, where `node` is an object `{field: string, value: string, path: string[]}`. The function must either return a boolean value to set both the nodes field and value editable or read-only, or return an object `{field: boolean, value: boolean}`.
- `{function} error`
Set a callback method triggered when an error occurs. Invoked with the error as first argument. The callback is only invoked
for errors triggered by a users action.
- `{boolean} history`
Enables history, adds a button Undo and Redo to the menu of the JSONEditor. True by default. Only applicable when `mode` is 'tree' or 'form'.
- `{String} mode`
Set the editor mode. Available values: 'tree' (default), 'view', 'form', 'code', 'text'. In 'view' mode, the data and datastructure is read-only. In 'form' mode, only the value can be changed, the datastructure is read-only. Mode 'code' requires the Ace editor to be loaded on the page. Mode 'text' shows the data as plain text.
- `{String[]} modes`
Create a box in the editor menu where the user can switch between the specified modes. Available values: see option `mode`.
- `{String} name`
Initial field name for the root node, is undefined by default. Can also be set using `JSONEditor.setName(name)`. Only applicable when `mode` is 'tree', 'view', or 'form'.
- `{boolean} search`
Enables a search box in the upper right corner of the JSONEditor. True by default. Only applicable when `mode` is 'tree', 'view', or 'form'.
- `{Number} indentation`
Number of indentation spaces. 2 by default. Only applicable when `mode` is 'code' or 'text'.
- `{JSON} json`
Initial JSON data to be loaded into the JSONEditor. Alternatively, the method `JSONEditor.set(json)` can be used to load JSON data into the editor.
*Returns:*
- `{JSONEditor} editor`
New instance of a JSONEditor.
### Methods
#### `JSONEditor.collapseAll()`
Collapse all fields. Only applicable for mode 'tree', 'view', and 'form'.
#### `JSONEditor.expandAll()`
Expand all fields. Only applicable for mode 'tree', 'view', and 'form'.
#### `JSONEditor.set(json)`
Set JSON data.
*Parameters:*
- `{JSON} json`
JSON data to be displayed in the JSONEditor.
#### `JSONEditor.setMode(mode)`
Switch mode. Mode `code` requires the [Ace editor](http://ace.ajax.org/).
*Parameters:*
- `{String} mode`
Available values: `tree`, 'view', `form`, `code`, `text`.
#### `JSONEditor.setName(name)`
Set a field name for the root node.
*Parameters:*
- `{String | undefined} name`
Field name of the root node. If undefined, the current name will be removed.
#### `JSONEditor.setText(jsonString)`
Set text data in the formatter.
*Parameters:*
- `{String} jsonString`
Contents of the JSONformatter as string.
#### `JSONEditor.get()`
Get JSON data.
*Returns:*
- `{JSON} json`
JSON data from the JSONEditor.
#### `JSONEditor.getName()`
Retrieve the current field name of the root node.
*Returns:*
- `{String | undefined} name`
Current field name of the root node, or undefined if not set.
#### `JSONEditor.getText()`
Get JSON data as string.
*Returns:*
- `{String} jsonString`
Contents of the JSONformatter as string.
### Examples
A tree editor:
```js
var options = {
"mode": "tree",
"search": true
};
var editor = new JSONEditor(container, options);
var json = {
"Array": [1, 2, 3],
"Boolean": true,
"Null": null,
"Number": 123,
"Object": {"a": "b", "c": "d"},
"String": "Hello World"
};
editor.set(json);
editor.expandAll();
var json = editor.get(json);
```
A text editor:
```js
var options = {
"mode": "text",
"indentation": 2
};
var editor = new JSONEditor(container, options);
var json = {
"Array": [1, 2, 3],
"Boolean": true,
"Null": null,
"Number": 123,
"Object": {"a": "b", "c": "d"},
"String": "Hello World"
};
editor.set(json);
var json = editor.get(json);
```
## JSON parsing and stringification
In general to parse or stringify JSON data, the browsers built in JSON parser can be used. To create a formatted string from a JSON object, use:
```js
var formattedString = JSON.stringify(json, null, 2);
```
to create a compacted string from a JSON object, use:
```js
var compactString = JSON.stringify(json);
```
To parse a String to a JSON object, use:
```js
var json = JSON.parse(string);
```