Is a leading underscore allowed for MongoDB field names?

[Max Weber]

Hello everyone,

I seem to recall that a leading underscore is not allowed for MongoDB
field names? I mean I've read about it in the MongoDB documentation
some time ago, but I can not find the relevant documentation section
anymore. For sure _id is reserved field name, but are all field names
with a leading underscore reserved for internal MongoDB fields? And
can I use my own ids for the _id field (for example UUIDs)?

Best regards

Max

[Sam Millman]

I have never heard of _ prifxed fields being reserved except _id but if they were they are not anymore.

You can use whatever id you want for your document so long as you manage it. The default _id is only provided for ease really (default key).

To over write it just do an insert with _id and it will over write the default of that _id.

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[axlfu]

It is allowed
What's your mongoDB version?

[Max Weber]

Thank you for the answers. It is a new project, so I will use the
latest stable version of MongoDB.

Best regards

Max