JSON Keys

JSON Keys reads all top-level keys from a JSON object and outputs them as a JSON array of strings. The Count output provides the total number of keys. For OrderedJSON objects, keys are returned in their original insertion order. For plain dictionaries, keys are returned in sorted alphabetical order.

If the input is not a JSON object (for example, an array or a primitive value), both outputs return empty results.

Extract keys from an object:

Input: {"name": "circle", "radius": 1.5, "color": "red"}

Keys: ["name", "radius", "color"], Count: 3

Empty object:

Input: {}

Keys: [], Count: 0

Non-object input:

Input: [1, 2, 3]

Keys: [], Count: 0

Ordered keys preserved:

If the input was built with JSON Object (which uses OrderedJSON), keys appear in the order they were added, not alphabetically sorted.

• Discovering the structure of an unknown JSON object
• Iterating over keys by feeding the Keys array into JSON Array Get with a counter
• Validating that expected keys are present in a data payload
• Building dynamic UI or display logic based on available keys

• Keys are always strings, regardless of the value types they map to.
• Combine with JSON Array Get to iterate through keys and then use JSON Get to retrieve each value.
• The Count output is equivalent to what JSON Length would return for the same object.
• Key order from OrderedJSON sources (JSON Object, JSON Merge) is preserved — useful when order carries semantic meaning.