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11 tools available
Free developer tools: JSON formatter, Base64 decode, JWT decoder, regex tester, UUID generator, SQL formatter, hash generator and more.
Generate random UUIDs (v4) instantly. Copy with one click.
Encode and decode text or files to and from Base64 format instantly.
Convert Unix timestamps to readable dates and vice versa in multiple formats.
Decode and inspect JSON Web Tokens. View header, payload, and signature.
Test and debug regular expressions with real-time matching and explanation.
Format, beautify, and minify raw HTML markup with customizable indentation.
Prettify raw, messy SQL queries with uppercase keywords and line indentation.
Generate SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic hashes using Web Crypto API.
Encode special characters into percent-encoding or decode URL query strings safely.
Calculate Unix file permissions in octal (e.g. 755) and symbolic (rwxr-xr-x) notation.
Generate production-ready .gitignore files for Node.js, Python, React, Go, Java, and more.
Discover the best free online tools every developer should know about. From JSON formatters to JWT decoders, we cover it all.
Master JSON formatting with our comprehensive guide. Learn about proper indentation, validation, and structure.
Learn how to validate JSON online without installing software. Format, beautify, and check JSON syntax instantly with ToolNova's free JSON Validator.