JSON Output format

[avinash2015]

I have following JSON format which comes dynamically:
{
"JSON": [
{
"key": "a",
"val": "aaa",
"sub": [
{
"key": "b",
"val": "bbb"
}
]
}
]
}
And I want to convert it in following output:

{
"JSON": [
{
"a": "aaa",
"sub": [
{
"b": "bbb"
}
]
}
]
}

Instead of key word I want actual Key-Value and instead of value word I want actual value.
So where to modify form2js.
My HTML is:

:

[maxatwork]

Closing as out of scope. Converting form fields like key/val into arbitrary dynamic object keys is treated as application-level transformation, not parser behavior. The current project explicitly keeps form2js focused on path-based data shaping rather than custom remapping semantics.