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Should I use Jsonlint?

[{}JSONLint](/) - jsonlint.com

Worth it. Buy — it's free: JSONLint is the classic paste-and-validate tool for quick JSON fixes. Skip it for confidential payloads or automated pipelines; run a local linter there instead.

Confidence

High. Based on 40+ public sources (snippet-level); no hands-on testing.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityNo evidence of any support channel.
  • Security posture

Pricing

$0

Free

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes

Best for

  • Devs debugging API payloads
  • Quick one-off JSON checks
  • Formatting minified JSON
  • Students learning JSON syntax

Not for

  • Anyone with confidential or production data — never paste it into online validators
  • CI/CD pipelines needing automated, repeatable linting
  • Teams wanting schema validation or auto-repair
  • Anyone expecting support, SLAs, or vendor accountability

Gotchas - check before you buy

high

Online validators are a known leak vector — no data protection guarantees.

medium

Using the npm jsonlint package? Version 1.0 has a high-severity CVE; update.

low

Ad-funded site: a case study covers increasing its ad revenue, so expect ads.

low

JSON comments are invalid by spec and get flagged — a common surprise for users.

Pros and cons

Pros

  • Completely free, no signup required.
  • Real-time validation and formatting in the browser.
  • Source code is publicly available on GitHub.
  • Regularly appears in roundups of best JSON formatters.
  • Documents specific error codes (E001) for clearer debugging.

Cons

  • Site is monetized through ads around the editor.
  • Pasting sensitive JSON into online tools risks exposure.
  • Related npm package had high-severity CVE-2022-42227.
  • Fewer features than rivals offering auto-repair and extras.

Sources & method

Analyzed 10/05/2026 - 12 sources - No website breaches found; the npm jsonlint package has known high-severity CVEs, and the site publishes its own security page.

official x4review x5security x2news x1
  • CVE-2022-42227 (High), jsonlint 1.0 npm package is vulnerable to heap-buffer overflow.
  • CVE-2021-23358 (High), High-severity underscore 1.6.0 vulnerability flagged in scans referencing jsonlint.

Key stats

  • Value for money: 5/5

    Rating

  • $0

    Starting price

  • 12

    Sources

  • Analyzed

  • Value for money: 5/5. Free; there is nothing to pay.
  • Ease of use: 5/5. Paste, validate, done; tutorials call it easy.
  • Feature depth: 2/5. Basic validate/format; rivals add repair features.
  • Support quality. No evidence of any support channel.
  • Security posture: 2/5. CVEs in npm lib; paste-privacy risk online.
  • $0 Price Free online validator and formatter
  • None Signup required Listed among free no-signup dev tools
  • 14 Alternatives tracked In 2026 comparison roundups
  • 1 high Known CVEs (npm lib) CVE-2022-42227, jsonlint 1.0

Pricing

Free

$0

  • Validate and format JSON online
  • No signup required
  • Ad-supported site

Security

No website breaches found; the npm jsonlint package has known high-severity CVEs, and the site publishes its own security page.

  • CVE-2022-42227 (High)jsonlint 1.0 npm package is vulnerable to heap-buffer overflow.⁹
  • CVE-2021-23358 (High)High-severity underscore 1.6.0 vulnerability flagged in scans referencing jsonlint.10

What users say

A long-standing default for quick JSON checks; users call it easy, though 2026 comparisons list many richer alternatives.

“よく使うサイトなので単純なオススメ的な話。”
Japanese dev blog
“การใช้ JSONLint นั้นง่าย”
EPT programming tutorial (Thai)
Full analysis

Based on 40+ public sources (snippet-level); no hands-on testing.

Free, no-signup JSON validator — fine for quick checks. Never paste confidential data; use local linting for CI.

Methodology

Based on 40+ public sources (snippet-level); no hands-on testing.

Sources

  1. JSONLint - The JSON Validatorjsonlint.com
    official
  2. Source code for jsonlint.comgithub.com
    official
  3. JSONLint error code E001jsonlint.com
    official
  4. JSONLint comments documentationjsonlint.com
    official
  5. Free no-signup tools list (Reddit)reddit.com
    review
  6. 5 Best JSON Formatter Online Toolshypertest.co
    review
  7. Best Free JSON Formatters Comparedtoolbox-kit.com
    review
  8. JSONLint 2026 Reviewaijet.cc
    review
  9. CVE-2022-42227: jsonlint 1.0 heap-buffer overflowbreachspider.com
    security
  10. CVE-2021-23358 in underscore 1.6.0github.com
    security
  11. Is Your Data Safe When Using Online JSON Validators?inventivehq.com
    review
  12. BidTune ad revenue case studybidtune.com
    news

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