Hi,
Any suggestions for data masking? if not supported directly…can I create my own middleware where I can create my own function/rule?
any suggestion.
I have tried -
read-only non-materialized views
field-level redaction
field-level encryption
does not work for my requirement. 
Thanks in advance guys.
did you try
https://docs.mongodb.com/manual/reference/method/db.createView/
Why field-level redaction didn’t work ?
Please, describe more on your requirement.
Hi Dominic,
Thanks for your reply.
I don’t want to interact with views, I want to consume the actual environment but masked. so that I can investigate the production issues with actual data instead of views.
However, I am trying to implement a static masking app where I will apply a rule on fields for which I wanted to mask data.
I am using c# .net for this tool…can you suggest me more how should I proceed to achieve my requirement.
Thanks in advance! 
A little late but I recently blogged about Data Masking in MongoDB: Paul Done's Technical Blog: MongoDB Data Masking Examples
Hope this is useful, if a little late.
Also try looking at Secupi or Priviator