Multiple keys with same value in javascript object

Question

so I'm trying to replicate an HTTP payload which has two same keys with different values.

const x = {};
x['house'] = 'table';
x['house'] = 'food';

The above doesnt work. Is there another alternative?

You need an array of values x['house'] = ['table', 'food'] — Zohaib Ijaz
– Zohaib Ijaz, Commented Jan 31, 2020 at 17:13
Does this answer your question? Does JSON syntax allow duplicate keys in an object? — evolutionxbox
– evolutionxbox, Commented Jan 31, 2020 at 17:14

T.J. Crowder · Accepted Answer · 2020-01-31 17:14:23Z

5

The usual way to do that is to use an array:

const x = {};
x.house = ["table", "food"];

Or

const x = {
    house: ["table", "food"]
};

You could also use a Set:

const x = {
    house: new Set()
};
x.house.add("table");
x.house.add("food");

or

const x = {
    house: new Set(["table", "food"])
};

I've used dot notation above, but you can use brackets notation as you did in your question if you prefer:

const x = {};
x["house"] = ["table", "food"];

answered Jan 31, 2020 at 17:14

T.J. Crowder

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5 Comments

evolutionxbox Over a year ago

If the HTTP payload has duplicate keys, wouldn't it be better to use a string, and then parse it?

Miguel Betancourt Over a year ago

This doesn't quite work for me because I need the two values to be in a separate key with the same name

T.J. Crowder Over a year ago

@MiguelBetancourt - What's the use case? (I can't think of one.) It's impossible to have two properties in the same JavaScript object with the same name, and a JavaScript property can have only one value, so it's a matter of using that one value to refer to multiple things, whether that's an array, another plain object, an object like a Set, a string you parse as evolutionxbox mentioned, or a FormData object as Titus mentioned, etc.

Miguel Betancourt Over a year ago

I'm trying to simulate a POST request with a payload which has two keys with the same name but a different value

T.J. Crowder Over a year ago

@MiguelBetancourt - That just doesn't exist in JavaScript (other than as described above). (FormData gets you close.) For example, JavaScript-based server-side mechanisms for receiving HTTP requests give you arrays for repeated parameters; example.

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