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JSON.stringify keys to serialize.

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Original file line number	Diff line number	Diff line change
`@@ -431,3 +431,29 @@ console.log(globalThis) //get the global this depends on your environment`
`431`	`431`	```
`432`	`432`
`433`	`433`
	`434`	`+`
	`435`	`+# The second argument of JSON.stringify lets you cherry-pick 🍒 keys to serialize.`
	`436`	+```javascript
	`437`	`+constuser= {`
	`438`	`+ id:459,`
	`439`	`+ name:'JS snippets',`
	`440`	`+ age:29,`
	`441`	`+ education:{`
	`442`	`+ degree:'Masters'`
	`443`	`+ }`
	`444`	`+}`
	`445`	`+`
	`446`	`+JSON.stringify(user,[name,age],2)`
	`447`	`+`
	`448`	`+/*`
	`449`	`+returns`
	`450`	`+`
	`451`	`+{`
	`452`	`+ "name": "JS snippets",`
	`453`	`+ "age": 29`
	`454`	`+}`
	`455`	`+`
	`456`	`+`
	`457`	`+*/`
	`458`	`+`
	`459`	+```

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