How to convert an array of key-value tuples into an object

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As baao notes, since 2019 you can use Object.fromEntries(arr) (docs) to do exactly this on all modern browsers:

var arr = [['cardType', 'iDEBIT'],
  ['txnAmount', '17.64'],
  ['txnId', '20181']];

console.log(Object.fromEntries(arr));

If that’s not available, my previous solution was to map to an array of key-value objects and combine the objects by spreading into Object.assign:

Object.assign(...arr.map(([key, val]) => ({[key]: val})))

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