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<!DOCTYPE html> <html lang="en-US"> <body> <h1>JSON Convert all keys to lowercase</h1> <button onclick="myFunction()">Click Me</button> <script> var data = [ { "name": "Mike", "age": 36 }, { "NAME": "Jade", "AGE": 24 } ]; function myFunction(){ for(var i = 0; i < data.length; i++){ for (var key in data[i]) { if(key.toLowerCase() !== key){ data[i][key.toLowerCase()] = data[i][key]; delete data[i][key]; } } } console.log(data); } </script> <p><strong>Note</strong>: Click on the button and check your console</p> </body> </html>
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