Question

62

How can I check if a JSON is empty in NodeJS?

rated 0 times [ 63] [ 1] / answers: 1 / hits: 151980 / 12 Years ago, sat, july 14, 2012, 12:00:00

I have a function that checks to see whether or not a request has any queries, and does different actions based off that. Currently, I have if(query) do this else something else. However, it seems that when there is no query data, I end up with a {} JSON object. As such, I need to replace if(query) with if(query.isEmpty()) or something of that sort. Can anybody explain how I could go about doing this in NodeJS? Does the V8 JSON object have any functionality of this sort?

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tomas

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2 Years ago

answered 12 Years ago makaylahk · Accepted Answer

You can use either of these functions:

// This should work in node.js and other ES5 compliant implementations.

function isEmptyObject(obj) {

  return !Object.keys(obj).length;

}



// This should work both there and elsewhere.

function isEmptyObject(obj) {

  for (var key in obj) {

    if (Object.prototype.hasOwnProperty.call(obj, key)) {

      return false;

    }

  }

  return true;

}

Example usage:

if (isEmptyObject(query)) {

  // There are no queries.

} else {

  // There is at least one query,

  // or at least the query object is not empty.

}