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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
JWT Builder
Craft and sign JWTs with a user-provided secret
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
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
API Response Mocker
Define mock endpoints and responses for frontend dev
Diff / Patch Viewer
Visualize unified diffs with syntax highlighting
Timestamp Converter
Convert between Unix epoch, ISO 8601, RFC 2822, and human-readable
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
HTTP Status Code Reference
Searchable reference of all status codes
Chmod Calculator
Visual permission calculator for Unix file permissions
User-Agent Parser
Parse a user-agent string into browser, OS, device details
Markdown Table Generator
Visual table editor that outputs Markdown or HTML
Epoch Countdown
Live ticking Unix timestamp with conversion
Coming Soon
Snippet Manager
Save, tag, and search code snippets in localStorage
TOML ↔ JSON Converter
Parse and convert TOML configuration files