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As with every tool like this that I have tried, it can't handle large, realistic JSONs coming down from websites. It died with a 1.5 mb JSON, I just tried, anyway.

This is why I use JQ, which I have seen tackle gigabyte-size files.

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If you want a tool to visualize/understand/grep large JSON documents, try https://github.com/ckampfe/jstream

Disclaimer: I am the author and I regularly test it on JSON documents hundreds of MBs large.

nice work!

This isn't a visualizer. It does something JQ can do (although faster).

I've done my best to optimize it, although there's still room for improvement, but it's quite challenging (but I'll give it a try). The reason is that we're constrained by the browser's UI thread being single-threaded, so almost all online JSON tools will lag or freeze when handling large amounts of data (e.g., over 1MB).

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