What characters are NOT allowed in MongoDB field names?

Question

I figured out that of course . and SPACE aren\'t allowed. Are there other forbidden characters ?

Answer 1

You can use any (UTF8) character in the field name which aren't special (contains ".", or starts with "$").

https://jira.mongodb.org/browse/SERVER-3229

https://stackoverflow.com/a/7976235/311220

It's generally best to stick with lowercase alphanumeric with underscores though.