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use nodejs var as json object statement?

how do I use a nodejs var inside a json statement, I dont realy have the required vocabulary to explain but here is my simplifyed code:

test.json:

{
"test1":["test1.1", "test1.2"],
"test2":["test2.1", "test2.2"]
}

test.js:

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const json = require("./test.json")
function myFunction(TYPE){
return(json.TYPE[0])
}
console.log(myFunction("test1"))

as I use the "type" var it tries to uses it as an json statement or object but obviously there is no "type" there only is "test1" and "test2" but it interprets as "type" instead

>Solution :

Brackets to access the variable key should work

function myFunction(TYPE){
return(json[TYPE][0])
}
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