Sometimes, we want to fix ‘CastError: Cast to ObjectId failed for value “[object Object]” at path “_id”’ error with Mongoose.

In this article, we’ll look at how to fix ‘CastError: Cast to ObjectId failed for value “[object Object]” at path “_id”’ error with Mongoose.

How to fix ‘CastError: Cast to ObjectId failed for value “[object Object]” at path “_id”’ error with Mongoose?

To fix ‘CastError: Cast to ObjectId failed for value “[object Object]” at path “_id”’ error with Mongoose, we should check the object IDs we’re querying with are valid object IDs.

For instance, we write

const mongoose = require('mongoose');

console.log(mongoose.Types.ObjectId.isValid('53cb6b9b4f4ddef1ad47f943'));

to call mongoose.Types.ObjectId.isValid with a string to check if the string is a valid object ID.

Conclusion

To fix ‘CastError: Cast to ObjectId failed for value “[object Object]” at path “_id”’ error with Mongoose, we should check the object IDs we’re querying with are valid object IDs.