Playground

Type any FEEL expression and evaluate it in real-time. Use the quick examples to explore the language.

Quick examples:

FEEL Expression(1 + 2) * 3 - 4 / 2

Context (JSON) — optional variables

Reading the output

Field	Description
value	The evaluated FEEL value, serialized to JSON
warnings	List of non-fatal issues (e.g. undefined variable, unknown function)

Context JSON

Variables are passed as a JSON object. In unaryTest mode, the input value must be under the "?" key:

{ "?": 42 }

For regular expressions, any key becomes a variable:

{ "price": 10, "qty": 5 }

Keyboard shortcut

Press Ctrl+Enter (or ⌘+Enter on Mac) inside any input field to run the expression.