Use a public DNS server, such as Google’s 8.8.8.8, to resolve SRV lookups required by MongoDB’s connection string.
How do I fix the "Cannot create property _id on string" type error?
Validated on 20 Nov 2024 • Last edited on 6 Dec 2024
When attempting to assign the _id
property to a string during a MongoDB import, you may get the following error:
TypeError: Cannot create property `_id` on string
This error occurs when you try to manually assign _id
, which is a reserved field in MongoDB. In most cases, you do not need to manually assign the _id
field during the import process. When importing data into MongoDB, the database automatically assigns an _id
as the unique identifier for each document.
To fix this error, you can remove the _id
field from your JSON data file. MongoDB then automatically generates the _id
values for each document during the import process. For example, a data.json
file may look like this:
[
{ "name": "John Doe" },
{ "name": "Jane Doe" }
]
Then, when importing data.json
into MongoDB, the database automatically generates the _id
values needed for each document in data.json
, like this:
[
{ "_id": ObjectId("6174f998f7c34a001f4efbc2"), "name": "John Doe" },
{ "_id" : ObjectId("6174f99af7c34a001f4efbc3"), "name": "Jane Doe" }
]
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