Is valid JSON
Checks if the value is valid JSON.
Checks whether the incoming value is valid JSON text. A value passes when it is a piece of text that can be read as JSON, with correctly placed quotes, brackets, and commas. Use this when a field is expected to carry a JSON payload, for example a block of data received from another system, and you want to confirm it can be parsed before you try to read or transform it. Records that hold malformed or non-JSON text can then be routed somewhere else instead of causing errors further along.