Developer Tools

Developer utilities — converters, builders, and checkers.

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ENV / Shell / Docker Converter

Convert .env files to JSON, YAML, TOML, shell export, and Docker ENV instantly in your browser. Nothing is uploaded — all conversion is client-side.

JSON Formatter & Validator

Format, validate, and minify JSON instantly in your browser. Zero network requests — your data never leaves your device.

JWT Decoder

Decode JWT headers and payloads locally in your browser. Inspect claims, expiry, issuer, and timestamps without sending tokens anywhere.

Base64 Encoder / Decoder

Encode and decode Base64 locally in your browser. Supports text conversion, URL-safe Base64, and file-to-Base64 export.

Cron Expression Builder

Build cron expressions visually for Unix, Quartz, AWS EventBridge, and GitHub Actions. Preview upcoming run times instantly in your browser.

Structured Data Converter

Convert YAML, JSON, and TOML locally in your browser with multi-document YAML support and anchor resolution.

HTTP Security Headers Checker

Paste raw response headers or curl -I output to review common security headers locally, including CSP, HSTS, and COOP.

Log Formatter

Paste JSON, nginx, Docker, syslog, or plain logs to normalize, filter by level, and inspect them locally in your browser.

Reading Time Estimator

Estimate reading and speaking time instantly. Paste any text to get word count, character count, reading time, and speaking time — CJK-aware.

Color Palette + WCAG Checker

Check contrast ratios, AA/AAA compliance, generate palette variants, and export CSS or Tailwind v4 color tokens locally.