I have a nested JSON which has 2 layers The entire layer 2 consists of 1 JSON object nested with the 2nd key of layer 1I know the value of a key in layer 2 how do I get the name of the second key in l

You can iterate through the first layer of the JSON object and check if the value of the second key in each element matches the known value in layer 2. If it does, you can return the name of the second key in that element.

Here's some sample code in Python:

import json

# Example nested JSON
data = {
    "layer1_key1": {
        "layer2_key1": {
            "nested_key1": "nested_value1"
        }
    },
    "layer1_key2": {
        "layer2_key2": {
            "nested_key2": "nested_value2"
        }
    }
}

known_value = "nested_value2"

# Iterate through layer 1 and check if layer 2 value matches
for key in data.keys():
    layer2 = data[key].get("layer2_key1", None) # Change layer2_key1 to the actual name of the second key in layer 1
    if layer2 and layer2.get("nested_key2", None) == known_value: # Change nested_key2 to the actual name of the key in layer 2
        print(key) # This is the name of the second key in layer 1 that has the nested JSON object

In this example, the code will output "layer1_key2" since that is the name of the second key in layer 1 that has the nested JSON object with a value of "nested_value2" in layer 2