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JSON Formatter
Format, validate and minify JSON — 100% client-side.
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Guide
How JSON Formatter works
Step 01
Paste your JSON
The editor validates as you type. A green Valid badge appears when the JSON parses cleanly.
Step 02
Format or minify
One click to pretty-print with 2 or 4 spaces / tab, or to strip all whitespace for the smallest transport size.
Step 03
Fix errors inline
Any parse error appears below the editor with the character position — no guessing where the missing comma is.
FAQ
Frequently asked
Does this validate JSON5 or JSONC?+
No — we use the browser's native JSON.parse, which only accepts strict RFC 8259 JSON. Convert JSON5 / JSONC comments first.
Is there a size limit?+
Only what your browser can handle — a few MB should format instantly. Very large JSON may lock the tab momentarily during parse.
Is my JSON sent anywhere?+
No — parse and format happen entirely in your browser via JSON.parse and JSON.stringify. Nothing is uploaded.