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jq . file.json | less

or

curl ... | jq . | less

JSON Formatter for Chrome works with local files (you have to check the box in the settings to enable it).

It's super handy. Drag and drop json files into a new tab.

Link: https://chrome.google.com/webstore/detail/json-formatter/bcj...

I usually use jq to understand the structure of the file. `keys` will get you all the key names in an object; `with_entries(.value |= type)` will replace each element on an object with its type. You can quickly delve into a JSON and gain some understanding of it with jq.