JsonExtractString - ComfyUI Built-in Node Documentation

The JsonExtractString node reads a text string containing JSON data and extracts the value associated with a specific key. It converts the extracted value into a string. If the JSON is invalid, the key is not found, or the value is null, the node returns an empty string.

Inputs

Parameter	Description	Data Type	Required	Range
`json_string`	The text containing the JSON data to be parsed. This field supports multiline input.	STRING	Yes	N/A
`key`	The specific key whose value you want to extract from the JSON object. This field supports single-line input only.	STRING	Yes	N/A

Note: The node only extracts values from JSON objects (dictionaries). If the parsed JSON is not an object or if the specified key does not exist within it, the output will be an empty string. If the value associated with the key is null, the node also returns an empty string.

Outputs

Output Name	Description	Data Type
`output`	The string value extracted from the JSON for the specified key, or an empty string if the extraction fails.	STRING

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