JSON Formatter

Pretty-print, minify, and validate JSON. Everything runs in your browser.

Runs 100% client-side
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On this page4 sections
Input
Output
Output will appear here…

HOW TO USE

  1. 01Paste your JSON into the input area on the left.
  2. 02Click Format to pretty-print, Minify to compress, or Validate to check syntax.
  3. 03Click Copy to copy the result to your clipboard.

Try it

{"name":"qa.codes","type":"testing-hub","tools":["cypress","playwright"]}

WHEN TO USE

Use this when you receive minified or malformed JSON from an API response, a log dump, or a database field and need to read or review it. Format before pasting into a bug report, test fixture, or PR description. Use Validate any time you're unsure whether a payload will parse — catching a syntax error here saves a broken test run later.

WHAT BUGS THIS FINDS

  • Silent parse failures

    Minified JSON with a trailing comma or unquoted key silently breaks the consumer — Format + Validate surfaces the exact error line before it reaches CI.

  • Truncated API responses

    A response cut off mid-string produces JSON that looks plausible in a log viewer but fails to parse — Validate flags the unterminated string immediately.

  • Escaped character corruption

    Copy-pasting JSON through Slack or email can mangle smart quotes and backslashes; Format normalises them so you see the real structure.

  • Type disguised as string

    A number or boolean wrapped in quotes passes string validation but breaks numeric comparisons downstream — formatted output makes the extra quotes visible at a glance.

QA USE CASES

01

API response inspection

Format a raw HTTP response body before asserting on individual fields — readable structure makes path mistakes obvious before you write the assertion.

02

Test fixture preparation

Paste a production-like payload, format it, trim to only the fields your test cares about, then save as a fixture file with consistent indentation.

03

Bug report evidence

Minify the payload to a single line for curl reproduction steps, or format it for the readable attachment that goes into the ticket.