TechFinity toolkit
Developer Workbench
JSON, regular expressions, URLs, query strings, JWT inspection, text transforms, Base64, UUIDs, and practical examples in one local browser workspace.
JSON formatter & validator
Pretty-print or minify JSON entirely in your browser.
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Regular expression tester
Try a known example, change it, and see every match plus capture groups.
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Tip: g finds all matches, i ignores case, and m makes ^ and $ work per line.
Regex quick reference
Common building blocks. Combine them and use the examples above to see the effect.
^ $Start / end of string or line with m.\bWord boundary..Any character except newline unless s.\d \w \sDigit, word character, whitespace.[A-Z]Character class / range.[^0-9]Negated character class.* + ?0+, 1+, or optional repetition.{2,5}Repeat 2 through 5 times.(...)Capture group.(?:...)Non-capturing group.(?<name>...)Named capture group.a|bAlternation: a or b.Important: a regex such as the IPv4 example only recognizes the shape. Use semantic validation when the numeric range matters; for example, 999.999.999.999 matches the simple shape but is not a valid IP address.
URL & query inspector
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JWT payload inspector
Decodes header and payload only. A decoded token is not a verified or trustworthy token.
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Base64 / UTF-8
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Text transforms & metrics
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Identifiers
Generated locally with Web Crypto.
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HTML entity helper
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Privacy: all workbench processing happens in your browser; entered content is not submitted to the server by these tools.