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Tools / 01 · JSON Formatter
JSON Formatter
Paste JSON to pretty-print, validate, or minify. Nothing leaves your browser.
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What Is a JSON Formatter and How to Use One
Frequently asked questions
- Is my JSON uploaded to a server?
- No. Parsing and formatting happen entirely in your browser. Your data never leaves the device, so you can safely paste API secrets, tokens, or user records without exposing them to a third party.
- What kinds of errors does it catch?
- It flags the four mistakes that break every API integration: trailing commas, single quotes instead of double quotes, unquoted object keys, and // or /* */ comments that strict JSON parsers reject.
- Can it minify as well as pretty-print?
- Yes. Use the Minify action to strip whitespace and shrink payloads for transport or storage, then pretty-print again whenever you need to read the structure.
- Is there a file size limit?
- Because processing is local, there is no server quota. Very large payloads (tens of megabytes) may take a moment on slower machines, but they still never leave your browser.