Before building our JSON formatter, we looked at how the most-referenced JSON tools — jsonlint.com and jsonformatter.org — actually split up their features.
A json syntax checker that makes you click a button
A comparison of these tools describes the standard flow: "paste your JSON, click Validate, and get both a formatted output and any syntax errors highlighted." That's an extra step for something that could just happen as you type. Ours validates on every keystroke — no button, no page reload.
json pretty print and json formatter are different pages
On jsonlint.com, pretty-printing and formatting live at separate URLs (/json-pretty-print and /json-formatter), and jsonformatter.org's tree view is a fully separate page too. Switching between beautify, minify, and tree view means switching pages. Ours keeps all three behind tabs on the same page — the JSON you pasted stays right where you left it.
Slow on large files, and ad-supported
The same comparison notes that JSONLint "falls short when formatting large JSON files — it can be slow, and the free version is ad-supported with fairly intrusive advertisements." That combination was common enough that a separate tool (JSONLinter.org) was built specifically as an ad-free, faster alternative. Our formatter runs standard JSON parsing entirely in your browser tab, with no ads inside the tool card.
Finding exactly where a JSON error is
A vague "invalid JSON" error is nearly useless on a large document. We write our own JSON syntax scanner (rather than parsing the browser's built-in error message, which has an inconsistent format across Chrome, Firefox, and Safari, and changes between browser versions) so the line and column we report point at the actual problem, consistently, no matter which browser you're using.
