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JSONLint

JSONLint validates and formats JSON in a browser, with a Mac app and Chrome extension also listed.

Place
#28 of 29
Score
5.8
JSONLint's website

What JSONLint is

JSONLint validates and formats JSON in a browser, with a Mac app and Chrome extension also listed. Users can paste or type JSON, or provide a URL containing JSON for retrieval and parsing; the validator reports errors with line numbers. Web tools include minifying, comparison, tree viewing, schema validation, and JSON Path queries. Converters cover JSON and CSV, Excel, SQL, YAML, XML, Java, and Python. JSONLint says browser validation does not send JSON content to its servers for processing. The free Chrome extension adds a collapsible tree, image previews, clickable URLs, timestamps, and export to jsonlint.com; its page says it operates on the client without tracking or collecting data. JSONLint Pro for Mac adds real-time validation, repair of common errors, conversions, tree view, and multi-document tabs. The Mac app works offline on the device and requires macOS 12.0 or later. Its listed price is $6.99 USD once.

Good

  • Reports validation errors with line numbers.
  • Includes schema validation and JSON Path tools.
  • Offers converters for several data formats.
  • Mac app works offline and requires no account.
  • Free Chrome extension provides a collapsible JSON tree.

Watch out

  • Mac app requires macOS 12.0 or later.
  • Mac app costs $6.99 USD once.

Who it suits

JSONLint may suit developers who need to inspect, validate, or convert JSON in a browser. The Mac app is an option for users who need offline work and multi-document tabs.

Verdict

JSONLint covers JSON checks, formatting, comparison, and conversion, with web, extension, and Mac options. Choose the Mac app if offline use or multi-document tabs matter.

Plans and prices

From JSONLint's own pricing page, checked 2 Oct 2026.

All about pricing
PlanPriceWhat it gives you
JSONLint Pro$6.99, paid oncemacOS 12.0 or later · Mac app

The facts

Each one read from JSONLint's own pages, with the date it was checked.

What it does

Analytics and cookies
The privacy policy says the site uses Google Analytics and cookies for preferences, analytics, and advertising.checked 2 Oct 2026
Chrome extension
The free Chrome extension offers a collapsible JSON tree, image previews, clickable URLs, timestamps, and export to jsonlint.com.checked 2 Oct 2026
Conversions
The site lists converters between JSON and CSV, Excel, SQL, YAML, XML, Java, and Python.checked 2 Oct 2026
Error reporting
The site says its validator identifies errors and reports their line numbers.checked 2 Oct 2026
Extension privacy
The extension page says it operates client-side and does not track or collect data.checked 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.checked 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.checked 2 Oct 2026
Purpose
JSONLint is a validator and formatter for JSON that accepts pasted or typed code and URLs containing JSON.checked 2 Oct 2026
URL input
Users can supply a URL containing JSON for JSONLint to retrieve and parse.checked 2 Oct 2026
Web tools
JSONLint lists formatting, minifying, comparison, tree viewing, schema validation, and JSON Path tools.checked 2 Oct 2026

Where it runs

Mac app
JSONLint Pro offers real-time validation, repair of common JSON errors, formatting, conversions, tree view, and multi-document tabs.checked 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.checked 2 Oct 2026

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