I use http://drupal.org/project/views_datasource to get a JSON export, but it's not fully compatible with Views 3 (only Views 2).
I posted a feature request to ask for Views 3 support, cfr. #1356658: Make this module fully compatible with Views 3

But it might be better to "just" extend this module with JSON support as this module already integrates Batch API.

Comments

Yes json feature/support in this module makes more sense.

+1 for json

+ 1 for Json

Assigned:Unassigned» Steven Jones

I'm wondering about spinning JSON support out to a third party module, mainly to ensure that third party modules can implement output formats for VDE.
JSON output might be a little more tricky, but with some leading commas we should be able to do.

Status:Active» Fixed

This is now a standalone module: https://drupal.org/project/views_data_export_json

Status:Fixed» Closed (fixed)

Automatically closed -- issue fixed for 2 weeks with no activity.