Developer Tools
JSONViewerTool
Fast, browser-based JSON viewer, formatter, validator and converter that runs entirely client-side
- 0community votes
- 9DR by Ahrefs +2 (up) since last check
Ahrefs Domain Rating listed 6 Nov 2026, relisted 27 Oct 2026.
Free online tools for viewing, formatting, validating, converting and comparing JSON. All processing runs in your browser with no data uploads or server
What it is
JSONViewerTool: the homepage
JSONViewerTool is a collection of browser-based developer tools for working with JSON data. It provides a suite of utilities for viewing JSON in multiple formats (tree, code, text), formatting and beautifying unreadable JSON, validating syntax and catching errors, minifying payloads, comparing JSON structures, and converting JSON to other formats like CSV, Excel, YAML and XML. The platform also includes utilities like JWT decoder, Base64 encoder/decoder, and UUID generator.
All tools run entirely in the browser with no server uploads, storage or logging. This privacy-first approach makes it safe for handling sensitive API responses and production data. The interface displays input and output side-by-side for easy comparison and debugging. JSONViewerTool is designed for developers, QA engineers, data analysts and students who need practical JSON tools without installation or setup time. It works across modern browsers including Chrome, Edge, Firefox and Safari on both desktop and mobile devices.
Listed capabilities
- View JSON in tree, code, and text modes
- Format and beautify unreadable JSON
- Validate JSON and catch syntax errors
- Minify JSON to reduce payload size
- Convert JSON to CSV, Excel, YAML, and XML
- Decode JWT tokens and inspect claims
- Generate UUIDs and encode or decode Base64 data
- Compare and diff JSON structures
- Sort, search and transform JSON data
- All processing runs 100% client-side in browser
Pricing
Pricing model: Free
Follow JSONViewerTool for an email about each milestone, update and new product they post, in a daily summary.
JSONViewerTool metrics
| Metric | Value |
|---|---|
| Domain Rating | 9 +2 (up) since last check |
| Trust Flow | 7 no change since last check |
| Citation Flow | 30 no change since last check |
| Referring domains | 48 no change since last check |
| External backlinks | 218 no change since last check |
Ahrefs Domain Rating listed 6 Nov 2026, relisted 27 Oct 2026. Listed under topic: Science/Social Sciences (7). Majestic listed 25 Oct 2026, relisted 25 Oct 2026. Link data listed by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
JSONViewerTool domain listing data
Show the listing data
| Domain age | 10 months |
|---|---|
| Registered | |
| Expires | |
| Registrar | GoDaddy.com, LLC |
| DNSSEC | Not signed |
JSONViewerTool launch receipt entry
| Measure | At launch, then latest |
|---|---|
| Domain Rating (Ahrefs) | 7 to 9 +2 (up) since launch 25 Oct 2026, then 6 Nov 2026 |
| Trust Flow (Majestic) | 7 first measured 25 Oct 2026 |
| Referring domains (Majestic) | 48 first measured 25 Oct 2026 |
Day 11 since launch. Next receipt: day 30, 24 Nov 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
Before you launch
The playbook on SaaS Directory List lists what to prepare, what to post on launch day and where else to list your product.
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Quick answers
Is JSONViewerTool free to use?
Yes, all tools on JSONViewerTool are free to use without registration or account creation.
Is my JSON data uploaded or stored on a server?
No. All processing happens entirely in your browser. Your data is never uploaded, stored, or logged on any server.
Which browsers are supported?
JSONViewerTool works on recent versions of Chrome, Edge, Firefox, and Safari on both desktop and mobile devices.
Can I use JSONViewerTool on mobile devices?
Yes, the user interface is responsive and works on modern mobile browsers, though very large files may perform better on desktop.
Is there a file size limit?
There is no strict server limit since processing happens in your browser. Practical limits depend on your device memory and browser performance.
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