PreviewAny - ComfyUI Built-in Node Documentation

PreviewAny converts any input value into readable text so you can inspect it. Strings pass through unchanged, numbers and booleans become plain text, and other data types are serialized to JSON when possible (falling back to their plain string form if serialization fails). The resulting text is shown in the user interface and also returned as a string output for further processing.

Inputs

Parameter	Description	Data Type	Required	Range
`source`	Accepts any input data type for preview display. If no value is provided, the preview shows ‘None’.	ANY	Yes	Any data type

Conversion behavior

Values of type STRING are shown exactly as provided.
Values of type INT, FLOAT, or BOOLEAN are converted to plain text.
Any other non-empty value is converted to JSON text with an indent of 4 spaces; if that conversion fails, the node falls back to the value’s plain text form. If that also fails, the preview shows the message ‘source exists, but could not be serialized.’
If no value is connected or the value is empty, the preview shows ‘None’.

Outputs

Output Name	Description	Data Type
`result`	The input value converted to text format. The same text is also displayed in the user interface.	STRING

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Source fingerprint (SHA-256): 66b5283b2d7d43e679c0bc6cdcad54c92539a986763333972e722b39c7963be8

​Inputs

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Inputs

Outputs