There are at least four ways to get to StackExchange data: OData (https://data.stackexchange.com/stackoverflow/atom/), Data Explorer (https://data.stackexchange.com/), XML data dumps (https://archive.org/details/stackexchange), and the API (http://api.stackexchange.com/2.2/).

The first three used to have EmailHash as a field in the User object. However, EmailHash is missing from all recent data I can find. This is documented here:

Could someone who knows explain why EmailHash is not currently being provided? Is this an oversight, or a policy change?


1 Answer 1


This was a deliberate change that went in a few weeks ago.

Since it is possible to get the email address from the hash, we no longer release email hashes to better protect people's privacy.

  • 1
    Thank you. So is there currently another way to find out a user's profile given some information about them, such as their email address? Or are there plans to have such support in the future?
    – Greg
    Feb 14, 2014 at 17:05
  • 5
    @Greg I'm not sure if we ever intended users to be discoverable that way. You could identify a user by their display name (which, to be fair, isn't unique), but we have no way (or, far as I know, intent) to allow finding a user profile by knowing any information that isn't otherwise publicly available.
    – Adam Lear StaffMod
    Feb 14, 2014 at 19:15

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