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Developer Tools

Free online developer tools — JSON validator, regex tester, cron explainer, Base64 encoder, UUID generator and more.

🔒 No data stored
⚡ Instant results
🆓 Always free
📱 Mobile-friendly
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JSON Validator
Validate JSON syntax instantly.
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JSON Formatter
Beautify and minify JSON.
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JSON Diff
Compare two JSON objects.
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Regex Tester
Test regex with live highlighting.
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Cron Explainer
Convert cron to plain English.
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Base64 Encoder
Encode/decode Base64.
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URL Encoder
Encode/decode URL components.
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UUID Generator
Generate UUID v4 in bulk.
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Hash Generator
SHA-1, SHA-256, SHA-512.
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Timestamp Converter
Epoch to date converter.