⌘
Developer Tools
Format, encode, decode, and debug
JSON Formatter & Validator
Pretty-print, validate, minify, and view JSON as a collapsible tree
Base64 Encoder/Decoder
Encode and decode text or files to/from Base64
URL Encoder/Decoder
Percent-encode and decode URL components
JWT Decoder
Paste a JWT and see decoded header, payload, and expiration
UUID / ULID Generator
Generate v4 UUIDs, ULIDs, nanoids — bulk and copy
Cron Expression Builder
Visual cron schedule builder with human-readable descriptions and next-run preview
HTML Entity Encoder
Encode/decode HTML entities — named and numeric
Timestamp Converter
Convert between Unix epoch, ISO 8601, RFC 2822, and human-readable
Chmod Calculator
Visual permission calculator for Unix file permissions
Epoch Countdown
Live ticking Unix timestamp with conversion
Coming Soon
JWT Builder
Craft and sign JWTs with a user-provided secret
SQL Formatter
Beautify and indent raw SQL queries
CSS Flexbox Playground
Toggle every flex property and see layout changes in real time
CSS Grid Playground
Visual grid builder — define rows, columns, gaps, place items
Open Graph Previewer
Paste HTML meta tags and preview social cards
Responsive Breakpoint Tester
Preview a URL at common device widths
Snippet Manager
Save, tag, and search code snippets in localStorage
API Response Mocker
Define mock endpoints and responses for frontend dev
Diff / Patch Viewer
Visualize unified diffs with syntax highlighting
YAML ↔ JSON Converter
Convert between YAML and JSON
CSV ↔ JSON Converter
Transform CSV to JSON array and vice versa
XML ↔ JSON Converter
Bidirectional XML and JSON conversion
TOML ↔ JSON Converter
Parse and convert TOML configuration files
HTTP Status Code Reference
Searchable reference of all status codes
User-Agent Parser
Parse a user-agent string into browser, OS, device details
Markdown Table Generator
Visual table editor that outputs Markdown or HTML