Why prettify JSON? Readability, debugging, and diff-friendly formatting
Minified JSON is a single line of dense text that saves a few kilobytes at the cost of being completely unreadable to humans. Pretty-printing JSON adds indentation and line breaks that make the structure visible at a glance, turning a wall of text into something you can actually debug.
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In production, minified JSON makes sense: smaller payloads mean faster page loads and lower bandwidth costs. During development, pretty-printed JSON is essential. It lets you scan for missing brackets, identify deeply nested structures, and most importantly, it makes diffs in version control meaningful. A one-character change in minified JSON can produce a diff that spans the entire file. The same change in pretty-printed JSON shows up as a single line diff, which is the difference between a 5-second code review and a 5-minute one.
Verdict
Pretty-print JSON during development and in version control. Minify it for production API responses and CDN-served static files. Most build tools (webpack, esbuild, Vite) can do the minification automatically as part of the production build, so you can keep pretty JSON in your repo and ship minified.
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Frequently asked questions
How many spaces should I use for JSON indentation?
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