JSON viewer for OS X I am looking for a JSON viewer for OS X that can:


open decently large files (e.g. > 10 MB), unlike the JSON Editor Eclipse Plugin  (take over 1 minute to generate the treeview for a 500 KB JSON file) and Json Tools Eclipse Plugin (no outline generated if file is more than a few MBs but otherwise great and fast)
has a decently responsive UI, unlike JSON Viewer for Windows
can collapse/expand a given level (treeview / outline)
works off-line


Ideally:


tabs
gratis
can edit JSON data
displays the filename somewhere, unlike JSON Viewer for Windows
provide some statistics on the JSON content
Jsoneditor is a browser-based editor that you can deploy locally or use the ad-sponsored online version provided by the author. It's handy for small JSON files, and I find it the easiest and most feature-full. It will highlight broken json, but it's not a 100% compatible validators like https://jsonlint.com/ because, for example, it treats raw tabs as valid within strings although this is not allowed by the JSON spec. 

JSONMate seems to be a usable open-source project with an online editor which probably won't be able to handle large files, but you can fork it on github, adapt to your needs and run it locally.

Intellij Idea and derivatives have decent JSON support but large files take time to load.

SublimeText is also usable for JSON if you install the plugins for beautifying and extra features.

For windows XMLMarker does a good job as an XML and JSON visualizer, but the last version which added JSON support is a limited trial.

Disclaimer: I am not affiliated with any of these tools and projects.