Question: I want to convert ObjectID (Mongodb) to String in JavaScript.
When I get a Object form MongoDB. it like as a object has: timestamp, second, inc, machine.
I can't convert to string.

Answer: 
Use toString:
`var stringId = objectId.toString()`

Works with the latest Node MongoDB Native driver (v3.0+):

<http://mongodb.github.io/node-mongodb-native/3.0/>
You could use `String`

```
String(a['_id'])

```