I have a an object jsonRes[0] containing values which need to be removed based on a condition. The following works to remove null, missing values and those equal to zero in the stringified object:

function replacer(key, value) {

          // Filtering out properties

          if (value === null || value === 0 || value === ) {

            return undefined;

          }

          return value;

        } 



JSON.stringify(jsonRes[0], replacer, t)

However, when I add a condition using the the includes method, I receive an error:

function replacer(key, value) {

          // Filtering out properties

          if (value === null || value === 0 || value ===  || value.includes($)) {

            return undefined;

          }

          return value;

        } 





Uncaught TypeError: value.includes is not a function

Why is this the case and is there a workaround?