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I'm working with ElasticSearch now which sometimes can throw 40MB JSONs back at me. Just browsing such a thing is difficult without support for collapsing/expanding some JSON subtrees (in brackets in JSON of course) and I need to edit this on top of browsing.
Is there an editor or at least viewer for OSX that is capable of doing that?
Unfortunately SublimeText 3 is not able to do that.
You can use Vim editor. See: How to fold text in a JSON file?
As per above, the minimal setup would be:
:set filetype=json
:syntax on
:set fdm=syntax
Then use zo and zc shortcuts to open and close foldings (see: :h fold-commands).
See also: Folding at Vim Wikia.
For better JSON highlighting of keywords vs values, you can consider vim-json plugin.
To improve performance further more for a big file, try to open it in read-only (-R).
