Hey guys I'm new here, and I upgraded eclipse recently.
I was having trouble opening json files within eclipse but I finally found the fix, so thought I'd share.
Here are the steps:
Click the "Help" tab
Click "Search"
Search "general"
Click "general"
Click the "General" hyperlink
Double-click "General"
Double-click "Editors"
Click "File Association"
Click "Add" on top-right
type ".json" (without quotations)
Click "ok"
Click "Add" on bottom-right
Scroll until you find "Text Editor"
Double-click "Text Editor"
Click "ok"
Hope it helps