What is BestJSON?
BestJSON is a browser-based JSON toolkit for developers, QA engineers and data analysts. Paste or load JSON and format, validate, repair or minify it in one place.
Everything runs locally in a Web Worker, so your data is not uploaded. Beyond formatting it includes a JSON diff, a viewer, JSON5 support and helpers like URL encoding and timestamp conversion.
Key features
- Format, validate, repair and minify JSON
- Accepts JSON5 and comments
- Side-by-side JSON diff
- Runs locally, no upload
Pros
- Fast even with large files
- Private by design
- Many JSON helpers in one site
Cons
- Young project compared to classic formatters
- Focused on JSON only
Best for
Cleaning up API responsesComparing two JSON payloadsFixing broken JSON
Ratings and reviews
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BestJSON FAQ
Is BestJSON free?
All tools are free and work without an account.
Do I need an account to use BestJSON?
No. BestJSON works without signing up, so you can open bestjson.com and start using it right away.
What are some alternatives to BestJSON?
Similar free tools that also work without an account include Regex101, CyberChef, Crontab Guru, Transform, JSON Crack and Carbon.