I have an array of string

let stringObjectIdArray = ['fssdlfsd343','43434234242','342424242']

and I want to change the string array into an object Id array by using mongoose type but it didn't work. It only works for a string not array type.

let objectIdArray = mongoose.Types.ObjectId(stringObjectIdArray)
// above will give error

Is there a way to help me in this case? Thank you very much for helping me!

I have an array of string

let stringObjectIdArray = ['fssdlfsd343','43434234242','342424242']

and I want to change the string array into an object Id array by using mongoose type but it didn't work. It only works for a string not array type.

let objectIdArray = mongoose.Types.ObjectId(stringObjectIdArray)
// above will give error

Is there a way to help me in this case? Thank you very much for helping me!

• javascript
• node.js
• mongodb
• mongoose

2 Answers 2

Use Array.prototype.map() to invoke the method on every element of the array and collect the results into a new array:

const objectIdArray = stringObjectIdArray.map(s => new mongoose.Types.ObjectId(s));

You can also simplify the accepted answer like this :

let objectIdArray = stringObjectIdArray.map(mongoose.Types.ObjectId);