Ways to resolve Error: CastError: The casting to ObjectId was unsuccessful for the value (string type) at the specified path "_id" in the model

Here is my current code snippet for the /api/students/id route:

router.get('/:id',asyncHandler(async(req,res)=>{
    const student = await Student.findById(req.params.id)

        if(student){
            
             res.json(student)

        }
        else{
            res.status(404).json({message: 'Student not found'})
        }

}))

export default router

Upon hitting the /api/students/{correct-Id}, I receive the correct student details. However, when I change the correct-Id to something different, an error occurs. Here's the link to the error message: https://i.sstatic.net/Yagyb.png

I am actually expecting the error message 'Student not found' in such cases. Any assistance would be greatly appreciated. Thank you.

Answer №1

Is the following code snippet present in your controller?

try {
///
} 
catch (error) {
   res.status(404).json({message: error.message})      
}

If it is, replace error.message with 'Student not found'

Answer №2

The ID you are sending is not formatted as an objectId, causing the findById function in your model to fail because MongoDB does not recognize it as a valid objectId.

To address the "student not found" error, ensure that you pass a valid objectId.

If you also want to handle invalid IDs, consider implementing a check similar to this.

However, ideally, if the objectId is invalid, the error message should be something like "Invalid ID" since you already know beforehand that the data does not exist. Displaying "student not found" would be misleading.

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