DevKit - Developer Toolbox

About

DevKit puts essential developer utilities right in your browser toolbar. No more switching tabs to format JSON, decode a JWT, or convert a timestamp.

── FORMATTERS ──
• JSON Formatter — format, minify, and validate JSON with instant error feedback
• Diff Viewer — compare two blocks of text side-by-side and see exactly what changed
• Markdown Preview — write Markdown and see the rendered output live

── ENCODERS & DECODERS ──
• Base64 — encode or decode Base64 strings in one click
• URL Encoder — encode or decode URL/URI components
• JWT Decoder — inspect the header, payload, and expiry of any JWT token
• HTML Entities — escape and unescape HTML entities
• Hash Generator — generate MD5, SHA-1, SHA-256, and SHA-512 hashes

── CONVERTERS ──
• Timestamp — convert between Unix timestamps and human-readable dates (ms and seconds)
• Number Base — convert between binary, octal, decimal, and hexadecimal
• Color Converter — convert between HEX, RGB, and HSL with a live color preview
• Case Converter — switch text between camelCase, PascalCase, snake_case, kebab-case, and more

── GENERATORS ──
• UUID Generator — generate v4 UUIDs instantly, one or in bulk

── INSPECTORS ──
• Regex Tester — test patterns against live text with match highlighting and capture groups
• String Inspector — count characters, words, lines, and bytes in any text

── WHY DEVKIT ──
✓ Results update as you type — no buttons to click
✓ One-click copy on every output
✓ Keyboard shortcut: Ctrl+Shift+D (Cmd+Shift+D on Mac)
✓ Dark and light themes
✓ Remembers your last tool and input between sessions
✓ Fully offline — nothing is sent anywhere

── PRIVACY ──
DevKit runs entirely in your browser. No data leaves your machine. No accounts. No analytics. No tracking. Ever.

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DevKit covers the browser. 1DevTool covers everything else.
Need AI agent terminals, an API client, and connections to 13 databases — all in one desktop app?
→ https://1devtool.com/