ComfyUI Node: Set/Create a Value in a JSON Object

Set/Create a Value in a JSON Object:

The LF_SetValueInJSON node is designed to modify or add key-value pairs within a JSON object. This node is particularly useful when you need to dynamically update JSON data structures, which are commonly used in various applications, including configuration files, data interchange formats, and more. By allowing you to set or create values within a JSON object, this node provides flexibility and control over your data, enabling you to tailor JSON content to meet specific requirements. Whether you are updating existing keys or inserting new ones, this node ensures that your JSON data remains accurate and up-to-date.

Set/Create a Value in a JSON Object Input Parameters:

json

This parameter represents the JSON object that you want to modify. It can be either a dictionary or a list of dictionaries. The node will update the specified key with the provided value within this JSON object. If the input is a list, each dictionary within the list will be updated. This parameter is crucial as it defines the structure that will be altered.

key

This parameter specifies the key within the JSON object that you want to update or insert. It is a string that identifies the location within the JSON structure where the new value will be set. The key must be unique within the context of the JSON object to avoid overwriting unintended data.

value

This parameter is the value that you want to set for the specified key in the JSON object. It is a string that will be assigned to the key, updating the JSON structure accordingly. The value can represent various data types, but it is provided as a string and will be interpreted as such within the JSON context.

Set/Create a Value in a JSON Object Output Parameters:

json_output

This output parameter returns the modified JSON object after the specified key-value pair has been set. The output retains the original structure of the input JSON but includes the updates made by the node. This allows you to use the updated JSON object in subsequent operations or nodes, ensuring that your data flow remains consistent and accurate.

Set/Create a Value in a JSON Object Usage Tips:

• Ensure that the json input is a valid JSON object or a list of JSON objects to avoid errors during execution.
• Use unique keys to prevent accidental overwriting of existing data within the JSON object.
• When working with lists of JSON objects, ensure that each element in the list is a dictionary to avoid type errors.

Set/Create a Value in a JSON Object Common Errors and Solutions:

Unsupported input type for 'json': <type>

• Explanation: This error occurs when the json input is neither a dictionary nor a list of dictionaries.
• Solution: Ensure that the json input is a valid JSON object (dictionary) or a list of JSON objects.

Expected a dictionary inside the list, but got <type>

• Explanation: This error occurs when an element within the list provided as the json input is not a dictionary.
• Solution: Verify that all elements within the list are dictionaries before passing it to the node.

TypeError: <error_message>

• Explanation: This error occurs when there is a type mismatch or an unexpected type is encountered during execution.
• Solution: Check the types of all input parameters to ensure they match the expected types (e.g., json should be a dictionary or list of dictionaries, key and value should be strings).