check if key exist in json javascript code example

Example 1: check if key exists in json typescript

if (cell.hasOwnProperty('Relationships')) {
	console.log("Key Found!!");
}
else {
	console.log("Not Found.");
}

Example 2: forjs check if key in json

var json = {key1: 'value1', key2: 'value2'}

"key1" in json ? console.log('key exists') : console.log('unknown key')

"key3" in json ? console.log('key exists') : console.log('unknown key')