JSON Hero
What JSON Hero is
JSON Hero is a browser-based tool for working with JSON. It can format, minify, validate, view, search, edit, compare, and share JSON documents. The editor pretty-prints data with syntax highlighting and can parse both strict JSON and malformed input using tolerant parsing. A collapsible tree, line numbers, bracket highlighting, and live search help navigate larger documents. You can load JSON from a public URL, a local file, or the clipboard, then download it in formatted or minified form. Comparison tools support ignore rules, matching arrays by key, and a compatibility report. Formatting, minifying, validation, searching, folding, unescaping, and downloading happen on your device. Sharing works differently: making a share link uploads the JSON, and anyone with the link can view it without a password. The free plan’s shared data is deleted after seven days. Free use requires no account and allows documents up to 100 KB. A Pro plan is listed at $4.99 a month, but it is not on sale yet. Its listed tools include expanded comparison options, comparison exports, larger documents, and priority email replies.
Who it suits
JSON Hero suits people who need to inspect, edit, validate, or compare JSON in a browser without creating an account or installing software. It can also suit users who need share links or advanced comparison exports, once the Pro plan is available.
What it does well
- Works in a modern browser with no sign-up or installation.
- Processes common JSON tasks on the user's device.
- Loads JSON from URLs, files, or the clipboard.
- Compares documents with ignore rules and key-matched arrays.
- Free plan has no ads.
What to know first
- Free documents are limited to 100 KB.
- Free share links are viewable by anyone who has the link.
- Free shared data is deleted after seven days.
- Pro is not on sale yet.
Limits
The free plan supports documents up to 100 KB, 30 new share links per hour, and 100 per day; free share data expires after seven days. Pro is listed at $4.99 a month and allows 1 MB documents and 500 shares per day, but it is not on sale yet.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Forever. No account required. · 100 KB per document · links expire after 7 days · 30 shares per hour · 100 shares per day · no ads | Free |
| Pro (not on sale yet) | Monthly or annually; the page says Pro is not on sale yet. · 1 MB per document · share links last 7, 30, or 90 days, or until deleted · 500 shares per day · priority email replies | $4.99 a month |
As jsonhero.dev lists them, read 9 Oct 2026. The maker's own page has the final word.
Getting started
- Open https://jsonhero.dev/ in a modern browser.
- Load JSON from a public URL, a local file, or the clipboard.
- Format, validate, search, edit, or compare the JSON in the editor.
- Download formatted or minified JSON, or create a share link if you want others to view it.
- Check the pricing page for email notification when Pro opens.
Verdict
Choose JSON Hero for browser-based JSON editing, validation, navigation, and comparison. Look elsewhere if you need password-protected share links or need Pro features now, since shared links are not password protected and Pro is not on sale yet.
Questions
Is JSON Hero free?
Yes. Its Free plan costs nothing, is billed forever, and requires no account.
What does Pro cost?
Pro is listed at $4.99 a month, billed monthly or annually. The pricing page says it is not on sale yet.
Which platforms does it support?
JSON Hero is available on the web and runs in a modern browser.
Does it upload my JSON?
Formatting, minifying, validating, searching, folding, unescaping, and downloading run on your device. Creating a share link uploads the JSON.
Can anyone open a shared link?
Anyone with the link can view it, and links are not password protected. Free-plan data is deleted after seven days.
What does Pro add?
Pro removes comparison rule limits, saves rule presets in the browser, exports comparisons as JSON Patch, unified diff, or Markdown, and includes priority email replies.
Facts from JSON Hero's own pages
- Availability
- The pricing page says Pro is not on sale yet and offers email notification when it opens. · jsonhero.dev, 9 Oct 2026
- Billing
- The pricing page says prices are per person, taxes are included, Indian customers are billed in rupees, and everyone else in US dollars. · jsonhero.dev, 9 Oct 2026
- Browser based
- The editor runs in a modern browser with no sign-up or installation required. · jsonhero.dev, 9 Oct 2026
- Comparison
- Users can compare two JSON documents with ignore rules, arrays matched by key, and a compatibility report. · jsonhero.dev, 9 Oct 2026
- Formatting
- It pretty-prints JSON with syntax highlighting and supports strict and tolerant parsing for malformed JSON. · jsonhero.dev, 9 Oct 2026
- Import and export
- Users can load JSON from a public URL, a local file, or the clipboard, and download formatted or minified JSON. · jsonhero.dev, 9 Oct 2026
- Local processing
- Formatting, minifying, validating, searching, folding, unescaping, and downloading run on the user's device; this JSON is not uploaded. · jsonhero.dev, 9 Oct 2026
- Navigation and search
- It provides a collapsible tree, line numbers, bracket highlighting, and real-time search with highlighted matches. · jsonhero.dev, 9 Oct 2026
- Pro comparison tools
- Pro removes comparison rule limits, saves rule presets in the browser, and exports comparisons as JSON Patch, unified diff, or Markdown. · jsonhero.dev, 9 Oct 2026
- Purpose
- JSON Hero is an online tool for formatting, minifying, validating, viewing, searching, editing, comparing, and sharing JSON. · jsonhero.dev, 9 Oct 2026
- Share limits
- The free plan allows up to 100 KB per document, 30 new links per hour, and 100 per day; Pro allows up to 1 MB and 500 links per day. · jsonhero.dev, 9 Oct 2026
- Sharing and security
- Creating a share link uploads the JSON; anyone with the link can view it, links are not password protected, and the free-plan data is deleted after 7 days. · jsonhero.dev, 9 Oct 2026
- Support
- Pro includes priority replies by email at [email protected]. · jsonhero.dev, 9 Oct 2026
Where JSON Hero stands on Freedom251
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