godot/doc/classes/JSON.xml

<?xml version="1.0" encoding="UTF-8" ?>
<class name="JSON" inherits="Resource" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
	<brief_description>
		Helper class for creating and parsing JSON data.
	</brief_description>
	<description>
		The [JSON] class enables all data types to be converted to and from a JSON string. This is useful for serializing data, e.g. to save to a file or send over the network.
		[method stringify] is used to convert any data type into a JSON string.
		[method parse] is used to convert any existing JSON data into a [Variant] that can be used within Godot. If successfully parsed, use [member data] to retrieve the [Variant], and use [code]typeof[/code] to check if the Variant's type is what you expect. JSON Objects are converted into a [Dictionary], but JSON data can be used to store [Array]s, numbers, [String]s and even just a boolean.
		[b]Example[/b]
		[codeblock]
		var data_to_send = ["a", "b", "c"]
		var json_string = JSON.stringify(data_to_send)
		# Save data
		# ...
		# Retrieve data
		var json = JSON.new()
		var error = json.parse(json_string)
		if error == OK:
		    var data_received = json.data
		    if typeof(data_received) == TYPE_ARRAY:
		        print(data_received) # Prints array
		    else:
		        print("Unexpected data")
		else:
		    print("JSON Parse Error: ", json.get_error_message(), " in ", json_string, " at line ", json.get_error_line())
		[/codeblock]
		Alternatively, you can parse strings using the static [method parse_string] method, but it doesn't handle errors.
		[codeblock]
		var data = JSON.parse_string(json_string) # Returns null if parsing failed.
		[/codeblock]
		[b]Note:[/b] Both parse methods do not fully comply with the JSON specification:
		- Trailing commas in arrays or objects are ignored, instead of causing a parser error.
		- New line and tab characters are accepted in string literals, and are treated like their corresponding escape sequences [code]\n[/code] and [code]\t[/code].
		- Numbers are parsed using [method String.to_float] which is generally more lax than the JSON specification.
		- Certain errors, such as invalid Unicode sequences, do not cause a parser error. Instead, the string is cleansed and an error is logged to the console.
	</description>
	<tutorials>
	</tutorials>
	<methods>
		<method name="get_error_line" qualifiers="const">
			<return type="int" />
			<description>
				Returns [code]0[/code] if the last call to [method parse] was successful, or the line number where the parse failed.
			</description>
		</method>
		<method name="get_error_message" qualifiers="const">
			<return type="String" />
			<description>
				Returns an empty string if the last call to [method parse] was successful, or the error message if it failed.
			</description>
		</method>
		<method name="get_parsed_text" qualifiers="const">
			<return type="String" />
			<description>
				Return the text parsed by [method parse] (requires passing [code]keep_text[/code] to [method parse]).
			</description>
		</method>
		<method name="parse">
			<return type="int" enum="Error" />
			<param index="0" name="json_text" type="String" />
			<param index="1" name="keep_text" type="bool" default="false" />
			<description>
				Attempts to parse the [param json_text] provided.
				Returns an [enum Error]. If the parse was successful, it returns [constant OK] and the result can be retrieved using [member data]. If unsuccessful, use [method get_error_line] and [method get_error_message] to identify the source of the failure.
				Non-static variant of [method parse_string], if you want custom error handling.
				The optional [param keep_text] argument instructs the parser to keep a copy of the original text. This text can be obtained later by using the [method get_parsed_text] function and is used when saving the resource (instead of generating new text from [member data]).
			</description>
		</method>
		<method name="parse_string" qualifiers="static">
			<return type="Variant" />
			<param index="0" name="json_string" type="String" />
			<description>
				Attempts to parse the [param json_string] provided and returns the parsed data. Returns [code]null[/code] if parse failed.
			</description>
		</method>
		<method name="stringify" qualifiers="static">
			<return type="String" />
			<param index="0" name="data" type="Variant" />
			<param index="1" name="indent" type="String" default="&quot;&quot;" />
			<param index="2" name="sort_keys" type="bool" default="true" />
			<param index="3" name="full_precision" type="bool" default="false" />
			<description>
				Converts a [Variant] var to JSON text and returns the result. Useful for serializing data to store or send over the network.
				[b]Note:[/b] The JSON specification does not define integer or float types, but only a [i]number[/i] type. Therefore, converting a Variant to JSON text will convert all numerical values to [float] types.
				[b]Note:[/b] If [param full_precision] is [code]true[/code], when stringifying floats, the unreliable digits are stringified in addition to the reliable digits to guarantee exact decoding.
				The [param indent] parameter controls if and how something is indented; its contents will be used where there should be an indent in the output. Even spaces like [code]"   "[/code] will work. [code]\t[/code] and [code]\n[/code] can also be used for a tab indent, or to make a newline for each indent respectively.
				[b]Example output:[/b]
				[codeblock]
				## JSON.stringify(my_dictionary)
				{"name":"my_dictionary","version":"1.0.0","entities":[{"name":"entity_0","value":"value_0"},{"name":"entity_1","value":"value_1"}]}

				## JSON.stringify(my_dictionary, "\t")
				{
				    "name": "my_dictionary",
				    "version": "1.0.0",
				    "entities": [
				        {
				            "name": "entity_0",
				            "value": "value_0"
				        },
				        {
				            "name": "entity_1",
				            "value": "value_1"
				        }
				    ]
				}

				## JSON.stringify(my_dictionary, "...")
				{
				..."name": "my_dictionary",
				..."version": "1.0.0",
				..."entities": [
				......{
				........."name": "entity_0",
				........."value": "value_0"
				......},
				......{
				........."name": "entity_1",
				........."value": "value_1"
				......}
				...]
				}
				[/codeblock]
			</description>
		</method>
	</methods>
	<members>
		<member name="data" type="Variant" setter="set_data" getter="get_data" default="null">
			Contains the parsed JSON data in [Variant] form.
		</member>
	</members>
</class>