Multiple properties with the same key in object literals can cause unexpected behavior in your application.

const foo = {
    bar: "baz",
    bar: "qux"
};

Rule Details

This rule disallows duplicate keys in object literals.

Examples of incorrect code for this rule:

::: incorrect

/*eslint no-dupe-keys: "error"*/

const foo = {
    bar: "baz",
    bar: "qux"
};

const bar = {
    "bar": "baz",
    bar: "qux"
};

const baz = {
    0x1: "baz",
    1: "qux"
};

:::

Examples of correct code for this rule:

::: correct

/*eslint no-dupe-keys: "error"*/

const foo = {
    bar: "baz",
    quxx: "qux"
};

:::