JSON Parsing Nodes

Reference for the nodes that validate JSON and read values out of it.

Category: Scooter Utilities > JSON > Parsing

Parsing nodes read and extract data from JSON strings. The getter nodes return true when they find the field, and put the value on an output pin.

NOTE

Field names are case-sensitive: Name and name are different fields.

Is Valid JSON

The gatekeeper. Checks whether a string is a valid JSON object before you try to parse it.

Pin	Direction	Description
JSON String	Input	The string to validate.
Return Value	Output	true if the string is a valid JSON object.

Is Valid JSON('{"name":"Bob"}')  → true
Is Valid JSON('not json at all') → false
Is Valid JSON('{"broken":}')     → false
Is Valid JSON('[1,2,3]')         → false (top-level arrays aren't supported)

Tips:

• Always check JSON that comes from outside sources, like files, web APIs, or user input.
• Returns false for empty strings.

Has Field

Does this field exist? Checks whether a specific field exists in the JSON.

Pin	Direction	Description
JSON String	Input	The JSON to check.
Field Name	Input	The field to look for.
Return Value	Output	true if the field exists.

JSON = {"name":"Bob","age":25}

Has Field(JSON, "name")  → true
Has Field(JSON, "email") → false

Tips:

• Works for any field type, including null fields.
• Returns false if the JSON is invalid.

Is Field Null

Is this field intentionally empty? Checks whether a field exists and has a null value.

Pin	Direction	Description
JSON String	Input	The JSON to check.
Field Name	Input	The field to check.
Return Value	Output	true if the field exists and is null.

JSON = {"name":"Bob","email":null}

Is Field Null(JSON, "email")   → true
Is Field Null(JSON, "name")    → false
Is Field Null(JSON, "missing") → false (doesn't exist)

Get String Field

Extracts text. Gets a string value from the JSON.

Pin	Direction	Description
JSON String	Input	The JSON to parse.
Field Name	Input	The field to get.
Out Value	Output	The string value.
Return Value	Output	true if the field exists.

JSON = {"name":"Bob","title":"Hero"}

Get String Field(JSON, "name")
→ Out Value: "Bob"
→ Return Value: true

Numbers and booleans are converted to text. Objects, arrays, and null give you an empty string.

Get Number Field

Extracts numbers. Gets a numeric value from the JSON as a Float.

Pin	Direction	Description
JSON String	Input	The JSON to parse.
Field Name	Input	The field to get.
Out Value	Output	The number as a float.
Return Value	Output	true if the field exists.

JSON = {"health":100,"damage":25.5}

Get Number Field(JSON, "health")
→ Out Value: 100.0
→ Return Value: true

Tips:

• Handles both whole numbers and decimals. Convert to an integer in your Blueprint if you need one.
• Return Value only tells you the field exists. It doesn't check that the value is a number. Values that can't be converted come back as 0.

Get Boolean Field

Extracts true/false. Gets a boolean value from the JSON.

Pin	Direction	Description
JSON String	Input	The JSON to parse.
Field Name	Input	The field to get.
Out Value	Output	The boolean value.
Return Value	Output	true if the field exists.

JSON = {"alive":true,"flying":false}

Get Boolean Field(JSON, "alive")
→ Out Value: true
→ Return Value: true

Get Array Field

Extracts lists. Gets an array from the JSON, with every element returned as a string.

Pin	Direction	Description
Array Type	Input	String Array, Number Array, or Object Array.
JSON String	Input	The JSON to parse.
Field Name	Input	The field to get.
Out Values	Output	The array elements, as strings.
Return Value	Output	true if the field exists and is an array.

// String array
JSON = {"items":["sword","shield","potion"]}
Get Array Field(String Array, JSON, "items")
→ Out Values: ["sword","shield","potion"]

// Number array (returned as strings)
JSON = {"scores":[100,200,25.5]}
Get Array Field(Number Array, JSON, "scores")
→ Out Values: ["100.0","200.0","25.5"]

// Object array
JSON = {"players":[{"name":"Alice"},{"name":"Bob"}]}
Get Array Field(Object Array, JSON, "players")
→ Out Values: ['{"name":"Alice"}','{"name":"Bob"}']

Tips:

• Numbers come back as strings, always with a decimal point. Convert them in your Blueprint with String to Float.
• Object arrays give you JSON strings that you can parse further with the other parsing nodes.
• In an Object Array, elements that aren't objects are skipped.
• Use a For Each Loop to process the items.

Get Object Field

Extracts nested objects. Gets a nested JSON object as a string.

Pin	Direction	Description
JSON String	Input	The JSON to parse.
Field Name	Input	The field to get.
Out JSON	Output	The nested object as a JSON string.
Return Value	Output	true if the field exists and is an object.

JSON = {"player":{"name":"Bob","health":100}}

Get Object Field(JSON, "player")
→ Out JSON: {"name":"Bob","health":100}
→ Return Value: true

// Now parse the nested object
Get String Field(Out JSON, "name")
→ "Bob"

Tips:

• This is how you walk through nested structures.
• Chain Get Object Field calls for deeply nested data.

Get All Field Names

What's in this box? Returns the names of every field in a JSON object.

Pin	Direction	Description
JSON String	Input	The JSON to inspect.
Out Field Names	Output	The names of all top-level fields.
Return Value	Output	true if the JSON is valid.

JSON = {"name":"Bob","age":25,"score":100}

Get All Field Names(JSON)
→ Out Field Names: ["name","age","score"]
→ Return Value: true

Tips:

• Use it with a For Each Loop to process JSON when you don't know its structure ahead of time.
• Field order isn't guaranteed.
• Great for debugging: print the names to see what's in your JSON.