What is the difference between == and === in JavaScript?

== (loose equality) converts the types before comparing. === (strict equality) compares the value and the type.

console.log(5 == "5");
console.log(5 === "5");
console.log(0 == false);
console.log(0 === false);
console.log(null == undefined);
console.log(null === undefined);

Output:

Use === and !== to avoid surprising results. See Type Conversion.

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