HTTP Post ; how to handle dynamic payload fields?

[ChillXXL]

I have troubles finding a solution to make a dynamic payload in a function node to be a input for a HTTP (Post) node.

The payload need to be formated like:

msg.payload = {
  "key_1": "value_1"
};

The "key_1" is a dynamic key and the "value_1" in this example is fixed.

The question is; how do I make the "key_1" string a string that can be filled by a variabele?

[Colin]

let v = "key_1"
let msg.payload = {}
msg.payload[v] = "value_1"

Untested as typed on phone

[ChillXXL]

@Colin

let v = "key_1"
let msg.payload = {}
msg.payload[v] = "value_1"

Untested as typed on phone

Thanks! I putted the variable between the brackets "[ ]" and it worked!