I benchmarked JSON Formatter Pro against JSON Viewer, the numbers speak for themselves

If you work with JSON in Chrome, you have probably tried a few formatting extensions. Full disclosure: I built json-formatter-pro as part of Zovo, a collection of 16 Chrome extensions I maintain. Take my perspective accordingly. After extensive testing, here is why JSON Formatter Pro wins this comparison for serious development work. The benchmarks Feature JSON Formatter Pro JSON Viewer Rating 4.8 stars 4.2 stars Extension size 738KiB 104KiB Last updated March 2026 February 2024 Large file rendering Up to 10MB smoothly Struggles over 2MB 5MB file render time 1.2 seconds 2.1 seconds Syntax highlighting Advanced, 6 themes Basic, single dark theme Error detection Line-by-line with descriptions "Invalid JSON" only Indentation options 2 to 8 spaces, inline/block arrays Fixed 2-space only Performance under real load I tested both with a 5MB API response file. JSON Formatter Pro rendered it in 1.2 seconds. JSON Viewer took 2.1 seconds. That 40% gap compounds when you are debugging multiple en