Table Of Contents

Unflatten from JSON (G Dataflow)

Version:
    Last Modified: March 15, 2017

    Converts a UTF-8 JavaScript Object Notation (JSON) string to another data type.

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    enable LabVIEW extensions

    A Boolean that determines whether JSON extensions support NaN and Inf values of floating-point numbers. Not all JSON parsers support these extensions.

    True Enable JSON extension support of NaN and Inf values of floating-point numbers.
    False Disable JSON extension support of NaN and Inf values of floating-point numbers.

    Default: True

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    path

    A specific item in the JSON string. Use path if your JSON string contains multiple items and you would like to extract a specific item from it. path uses an array of strings to identify the item, where each element in the array references either the name of a cluster element or an integer index of an array. If you specify an item using path, you must wire a data type to type and defaults that corresponds to the data type of the specified item.

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    JSON string

    The flattened UTF-8 string that you want to unflatten.

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    type and defaults

    The data type and default values to which you want to unflatten the JSON string. This input accepts Booleans, integers, floating-point numbers, strings, and arrays or clusters of these types. Cluster elements may be labeled or unlabeled, but not a combination of both. If elements in a cluster are labeled, then each name must be unique to that cluster. If elements in your JSON string are labeled, the elements wired to type and defaults must have an identical label. For example, if you have JSON string {"firstelement":"a","secondelement":"b"}, you must wire a cluster containing a string labeled firstelement and a string labeled secondelement. Additionally, if you specify the path to a particular item in your JSON string, the data type wired to type and defaults must match the data type of the item pointed to by path.

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    error in

    Error conditions that occur before this node runs.

    The node responds to this input according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Default: No error

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    default null elements?

    A Boolean that determines how null values in JSON string are processed.

    True Uses default values from the input cluster for null values in JSON string.
    False Returns an error for null values.

    Default: False

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    strict validation?

    A Boolean that determines whether to return an error when JSON string contains items not defined in type and defaults.

    True Returns an error when JSON string contains items not defined in type and defaults.
    False The JSON object may contain items not defined in type and defaults.

    Default: False

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    value

    Unflattened data of the same data type and structure as type and defaults.

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    error out

    Error information.

    The node produces this output according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Converting Data Types not Supported by Type and Defaults

    If JSON string represents a data type that type/defaults does not accept, such as an array of arrays or an array of mixed types, you cannot use a single Unflatten From JSON node to convert the entire JSON string. However, you can use path to identify and extract items in the JSON string.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: This product does not support FPGA devices


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