JSONLint
What JSONLint is
JSONLint validates and formats JSON on the web, with a Mac app and Chrome extension available. You can paste or type JSON, or provide a URL containing JSON for retrieval and parsing. The validator identifies errors and reports their line numbers. Web tools include formatting, minifying, comparison, tree viewing, schema validation, and JSON Path querying. Converters handle JSON with CSV, Excel, SQL, YAML, XML, Java, and Python. JSONLint says browser validation keeps JSON content from being sent to its servers for processing. The free Chrome extension adds a collapsible tree, image previews, clickable URLs, timestamps, and export to jsonlint.com. JSONLint Pro for Mac adds real-time validation, repair of common errors, conversions, tree view, and multi-document tabs. The Mac app works offline and requires macOS 12.0 or later. Pro costs $6.99, paid once.
Who it suits
JSONLint suits developers and analysts who need to validate, inspect, compare, convert, or query JSON. Mac users can work offline, while web users can submit JSON text or a URL.
What it does well
- Reports validation errors with line numbers
- Includes schema validation and JSON Path tools
- Converts JSON with several data formats
- Browser validation is not sent for processing
- Mac app works offline without an account
What to know first
- Mac app requires macOS 12.0 or later
- Web site uses analytics and cookies
- Paid Mac Pro is a one-time purchase
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| JSONLint Pro | macOS 12.0 or later · Mac app | $6.99, paid once |
As jsonlint.com lists them, read 2 Oct 2026. The maker's own page has the final word.
Verdict
JSONLint covers common JSON checking and transformation tasks across browser, extension, and Mac app formats. Its browser-side validation and offline Mac option may matter when handling sensitive files.
Facts from JSONLint's own pages
- Analytics and cookies
- The privacy policy says the site uses Google Analytics and cookies for preferences, analytics, and advertising. · jsonlint.com, 2 Oct 2026
- Chrome extension
- The free Chrome extension offers a collapsible JSON tree, image previews, clickable URLs, timestamps, and export to jsonlint.com. · jsonlint.com, 2 Oct 2026
- Conversions
- The site lists converters between JSON and CSV, Excel, SQL, YAML, XML, Java, and Python. · jsonlint.com, 2 Oct 2026
- Error reporting
- The site says its validator identifies errors and reports their line numbers. · jsonlint.com, 2 Oct 2026
- Extension privacy
- The extension page says it operates client-side and does not track or collect data. · jsonlint.com, 2 Oct 2026
- Mac app
- JSONLint Pro offers real-time validation, repair of common JSON errors, formatting, conversions, tree view, and multi-document tabs. · apps.apple.com, 2 Oct 2026
- Mac app privacy
- The Mac app listing says it works offline on the device and requires no account, analytics, tracking, or internet connection. · apps.apple.com, 2 Oct 2026
- Open source engine
- The site says its validator uses @jsonlint/core, which is available to install with npm for use in other projects. · jsonlint.com, 2 Oct 2026
- Privacy
- The privacy policy says JSON validation happens in the browser and JSON content is not sent to JSONLint servers for processing. · jsonlint.com, 2 Oct 2026
- Purpose
- JSONLint is a validator and formatter for JSON that accepts pasted or typed code and URLs containing JSON. · jsonlint.com, 2 Oct 2026
- URL input
- Users can supply a URL containing JSON for JSONLint to retrieve and parse. · jsonlint.com, 2 Oct 2026
- Web tools
- JSONLint lists formatting, minifying, comparison, tree viewing, schema validation, and JSON Path tools. · jsonlint.com, 2 Oct 2026
Where JSONLint stands on Freedom251
- JSON Tools#15 of 29