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The Private Developer Toolbox — fast, browser-based tools for JSON, JWT, Base64, URL encoding, and regular expressions. Every tool runs 100% client-side: your data never leaves your browser. Free for everyday use, with optional Pro features for power users.

Developer Tools

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  • JSON Diff
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Regex

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  • Java Regex Sheet
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Converters

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  • Roman Numerals

More Tools

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