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Should I use JsonFormatter?

Free online JSON formatter and validator - jsonformatter.org

Skip. Only acceptable for non-sensitive JSON you would not mind publishing; its paste URLs exposed thousands of passwords and API keys over roughly seven years. Free tools format JSON locally in your editor or browser, so there is no reason to accept that risk.

Confidence

Medium. Based on ~50 public sources; most snippets truncated, limiting depth on pricing and user reviews.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityNo support evidence in sources
  • Security posture

Pricing

$0

Free

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes

Best for

  • Formatting non-sensitive sample payloads
  • Quick browser validation
  • One-off checks and learning

Not for

  • Anyone pasting API keys, tokens, or credentials
  • Teams handling customer PII or regulated data
  • Companies with vendor security review requirements
  • Privacy-conscious developers; local tools are equally free

Gotchas - check before you buy

high

Anything you pasted was potentially publicly readable; rotate any keys or passwords sent through it

high

Researchers found bank credentials among 80,000+ exposed pastes and published them

medium

Alternative roundups appeared specifically after the data leak; trust damage is lasting

low

Gridinsoft rates the domain 78/100, acceptable but not clean

Pros and cons

Pros

  • Free online formatter and validator, no install needed
  • Includes extra utilities such as a YAML validator
  • Frequently cited across developer tool roundups and comparisons

Cons

  • Public paste URLs exposed thousands of passwords and API keys
  • Secrets reportedly sat exposed for around seven years
  • No security page found on the official site
  • Researchers report stored XSS via pasted content

Sources & method

Analyzed 10/06/2026 - 10 sources - Poor: researchers disclosed years of publicly readable user pastes containing passwords and API keys (Nov 2025).

official x1review x3security x4news x2
  • Mass leak of user-pasted secrets, WatchTowr Labs disclosed that JSONFormatter and CodeBeautify publicly exposed thousands of passwords and API keys via paste URLs.
  • Roughly seven years of exposure, Researchers describe a 'public clipboard' where pasted secrets sat readable for years.
  • Stored XSS reported, The same analysis reports stored XSS on the paste platform.

Key stats

  • Value for money: 5/5

    Rating

  • $0

    Starting price

  • 10

    Sources

  • Analyzed

  • Value for money: 5/5. Free; hard to beat the price
  • Ease of use: 4/5. Described as simple across tool comparisons
  • Feature depth: 3/5. Format, validate, plus converters; not an IDE
  • Support quality. No support evidence in sources
  • Security posture: 1/5. Multi-year public leak of user secrets
  • $0 Price Free web tool; no paid tiers in sources
  • 80,000+ Exposed user pastes Reported on Reddit, r/pwnhub
  • ~7 years Exposure window Secrets sat on public URLs
  • 78/100 Gridinsoft trust score URL reputation scan

Pricing

Free

$0

  • Online formatting and validation
  • Guess: ad-supported; no paid tiers surfaced in sources

Security

Poor: researchers disclosed years of publicly readable user pastes containing passwords and API keys (Nov 2025).

  • Mass leak of user-pasted secretsWatchTowr Labs disclosed that JSONFormatter and CodeBeautify publicly exposed thousands of passwords and API keys via paste URLs.²
  • Roughly seven years of exposureResearchers describe a 'public clipboard' where pasted secrets sat readable for years.⁴
  • Stored XSS reportedThe same analysis reports stored XSS on the paste platform.⁴

What users say

User-review coverage is thin and dominated by the November 2025 leak reporting; no substantive verbatim user quotes surfaced.

Full analysis

Based on ~50 public sources; most snippets truncated, limiting depth on pricing and user reviews.

Free and handy, but its public paste URLs leaked thousands of passwords and API keys for ~7 years. Format JSON locally instead.

Methodology

Based on ~50 public sources; most snippets truncated, limiting depth on pricing and user reviews.

Sources

  1. JSON Formatter (official site)jsonformatter.org
    official
  2. Thousands of Secrets Leaked on Code Formatting Platformssecurityweek.com
    news
  3. Cloud tools JSONFormatter and CodeBeautify quietly leaked thousands of passwords and API keysblog.intelligencex.org
    security
  4. Seven Years on a Public Clipboard: Pasted Secretsbeyondmemory.io
    security
  5. Sensitive Credentials Exposed on Code Beautifiers (Reddit)reddit.com
    security
  6. Jsonformatter.org Review: Safe or Legit? (78/100 Trust Score)gridinsoft.com
    security
  7. Read Customer Service Reviews of jsonformatter.orgtrustpilot.com
    review
  8. 7 Best JSONFormatter.org Alternatives in 2026 (After the Data Leak)aarrange.com
    news
  9. Stop Paying for Developer Tools: I Tested 7 Popular Platformsjavascript.plainenglish.io
    review
  10. Any other JSON validator tool with expand/collapse? (Reddit)reddit.com
    review

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