Check whether an object is empty

Check for own enumerable string keys on a JSON object.

JavaScript Version 1.0.0 · MIT · .md

function isEmpty(value) { return Object.keys(value).length === 0; }

Input & expected output

{
  "ready": true
}

false

The edge case

{}

true

Know the limits

• Input must be a non-null object, not an array. Symbol and non-enumerable keys are outside this JSON contract.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Check whether all values are equal — Compare every item with the first using Object.is.
• Check whether an integer is even — Test parity for safe integers, including zero and negative values.
• Check a leap year — Apply the Gregorian divisible-by-4, century and 400-year rules.