Web Reference: Writing Functions The Function node allows JavaScript code to be run against the messages that are passed through it. The message is passed in as an object called msg. By convention it will have a msg.payload property containing the body of the message. Aug 5, 2024 · In Node-RED, a function node allows you to write custom JavaScript code to process message objects in your flow. It's used for specific tasks that can't be accomplished with the standard built-in nodes alone. Jan 20, 2025 · The function node is used to run JavaScript code against the msg object. The function node accepts a msg object as input and can return 0 or more message objects as output.
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