Developer
High-signal browser utilities
Bookmarkable helpers for JSON, SQL, auth, and CSS—all run client-side unless noted. Jump into any tool below.
← All tools·30 utilities in catalog
Data & API
- J2TJSON to TypeScriptTurn sample JSON into interfaces and type aliasesOpen →
- JWTJWT DecoderInspect JWT header and payload (signature not verified)Open →
- JΔJSON CompareStructural diff for two JSON documentsOpen →
- XΔXML ComparePretty-print and line-diff two XML documentsOpen →
- CJCSV to JSON / JSON to CSVBidirectional conversion with delimiter and header optionsOpen →
- JYJSON to YAML / YAML to JSONRound-trip YAML and JSON with clear errorsOpen →
Security & DevOps
- CRCrontab GeneratorBuild cron expressions with a readable summaryOpen →
- BCBcrypt Hash GeneratorHash passwords with configurable cost (in your browser)Open →
- KEYAPI Key GeneratorCryptographically strong random stringsOpen →
- B64Base64 Encoder / DecoderEncode and decode text safely in the browserOpen →
- URLURL Encode / DecodeencodeURIComponent and decodeURIComponent helpersOpen →
Database & SQL
Frontend & markup
- RXJavaScript Regex TesterLive matches, flags, and capture groupsOpen →
- CSSSCSS / SASS to CSSCompile SCSS and indented SASS to CSS in the browserOpen →
- REMPX to REM / REM to PXAccessibility-friendly rem math with custom root sizeOpen →
- MINJavaScript MinifierMinify JS with Terser in the browserOpen →
- OBFJavaScript ObfuscatorObfuscate JS for demos only—expect larger bundlesOpen →
- MDMarkdown FormatterPrettier-powered Markdown formattingOpen →
- H2MHTML to MarkdownConvert sanitized HTML snippets to MarkdownOpen →
Marketing & analytics
- UTMUTM Campaign BuilderBuild encoded campaign URLs instantly in-browserOpen →
- ROIB2B ROI CalculatorEstimate projected revenue, ROI, and payback periodOpen →
- 10311031 Exchange TimelineMap identification (day 45) and closing (day 180) deadlines from your sale dateOpen →
- CFSaaS Cash Flow ValleyModel one cohort’s cumulative cash vs CAC, MRR, and churn over 24 monthsOpen →
- SWB2B Software ROI & PaybackPayback months, year-one ROI, and annual savings from efficiency gainsOpen →
- AICAI Agent Cost EstimatorEstimate monthly RAG spend across tokens, retrieval, and infraOpen →
- RWYSaaS Runway CalculatorForecast runway months from cash, growth, and burn assumptionsOpen →
- TAXSelf-Employment Tax EstimatorCompare sole prop, LLC, and S-corp tax outcomesOpen →