Best JSON Formatter Tools — A Practical Comparison (2025)

Shortlist of popular tools and how they compare on the things that matter: speed, privacy, and ergonomics.

Evaluation Criteria

• Privacy: Does data leave the browser?
• Performance: Is formatting instant on large payloads?
• UX: Copy, download, tree view, auto-correct.
• Noise: Ads, popups, or trackers present?

Why SimplyJSON Stands Out

• Privacy-first: 100% client-side. No uploads.
• Fast: Snappy rendering even for large JSON.
• No ads: Clean interface focused on the task.
• Features: Auto-correct, copy, download, tree view.

Try it now: JSON Formatter