Developer tools / JSONLint
JSONLint
JSONLint is the free online validator, json formatter, and json beautifier tool for JSON, a lightweight data-interchange format.
Where it stands
3.6 / 5
Signals score
Not a hands-on test
Based on 1 of 3 signals
- Website health3.9 / 5 · weight 50%
Measured from the tool's public website
Built only from what we can measure or quote without using the tool. How ranking works
Rank by signals
We have not run our own hands-on test on JSONLint yet. Facts checked 2026-11-08. How tests work
Disclosure: agathox makes some of the tools listed here. They are labelled and scored by the same method as every other tool.
Should you use JSONLint?
A quick read built only from what the tool's own pages state and from our tests, not from opinion. Facts checked 2026-11-08.
A good fit if…
Nothing is clearly stated yet.
Check first
- Its pages do not state: pricing, signup, watermark. Check on the tool's site before you rely on it.
Does: Code formatter
Measured signals
3.9 / 5 · measured 2026-11-08Read automatically from JSONLint's public website: how reliable, secure, private and open the site is. This is not a test of how well the tool does its job. How this is measured
- Reliability5 / 5The page answered and finished downloading in 129 ms.
- Security2 / 50 of 5 protective headers set.
- Privacy5 / 5No third-party tracking services found on the page.
- Transparency3 / 5Links a privacy policy; no pricing page linked.
Community feedback
Not enough discussion yet: 1 classified comment from 1 thread. We need at least 12 from 2 threads.
- Positive
“Thank you also for jsonlint.com; great tool.”
Read in the thread
Threads: JSONLint, The JSON Validator (2012, 17 comments)
- Free tier
- Not stated.
- Paid plan
- Not stated.
- Signup
- Not stated.
- Watermark
- Not stated.
- Where files go
- All JSON validation happens client-side in your browser, and data is never sent to servers. The page says: “All JSON validation happens client-side in your browser. Your JSON data is never sent to our servers for processing.”
From the tool's own pages, checked 2026-11-08. Sources: Privacy. Prices and limits change; check the tool before you rely on them.
Read automatically by a program, not by a person. Each fact quotes the sentence it came from, and a fact is shown only if that sentence is on the page. Where a page did not say, it reads “Not stated.”
Get an email if JSONLint changes
We check its official pages every week. If they change, we tell you, so you can see if the price or limits moved. No other email, and one click stops it.
Are you the maker of JSONLint? Link to this page
Copy this into your site. The link goes to this page, and it does not change any score.
<a href="https://agathox.com/tools/jsonlint">JSONLint on agathox: compared and tested</a>
Tasks and scores
- Code formatterNot tested yet
Similar tools
Top signals in Code formatter.
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