Warning: I wrote this blog in 2016. That is a long time ago, especially on the internet. My opinions may have changed since then. Technological progress may have made this information completely obsolete. Proceed with caution.
In the last two days I’ve written a new, simple JSON Formatter. This is a very simple tool that allows you to prettify/uglify JSON data. It is basically just a textarea tied to the JSON.stringify() method that is built-in on every modern browser.
I created this after being frustrated with other online formatters that don’t work well for large data because they require the data to be submitted to a server for validation. My tool runs entirely client side. Live preview here.