JSON

JSON Formatter

Paste any JSON to instantly format, validate, and minify it. Errors are reported with the exact line and column so you can fix them fast. Your data never leaves your browser.

input.jsonempty
output.json—
runtime

Browser-local execution

Inputs stay inside the current tab unless you copy, download or explicitly export.

memory

Session handoff

Magic Paste can pass input to a target tool through sessionStorage, never through the URL.

control

User-owned state

Favorites, recent tools and workflow history are local browser data you can clear from the browser.

smart handoff graph

Suggested next moves

session handoff ready
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How to use

  1. 01Paste your JSON into the input area on the left.
  2. 02Click Format to beautify, or Minify to compact it.
  3. 03Copy the result with the copy button on the right.
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FAQ

Is my JSON sent to a server?
No. All formatting and validation runs entirely in your browser using JavaScript. Nothing is uploaded.
What is the difference between formatting and minifying?
Formatting adds indentation and newlines so JSON is human-readable. Minifying removes all whitespace to reduce size, useful for production payloads.
Why does my JSON fail to parse?
Common issues are trailing commas, single quotes instead of double quotes, unquoted keys, or comments. Strict JSON does not allow any of those.
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