Developer Tools
Regex testers, JWT decoders, cron explainers
Git Command Generator
Describe what you want to do in plain English and get the exact Git command. Perfect for beginners.
API Request Builder
Build and test API requests in your browser. Like Postman, but no install needed. Send GET, POST, PUT, DELETE requests.
Cron Job Generator
Build cron expressions visually. Select schedule options and get the cron syntax automatically.
Redirect Checker
Check URL redirects, follow redirect chains, and see final destinations with status codes
Regex Tester
Test and debug regular expressions with live matching and highlighting
Regex Explainer
Paste any regex and get a plain English explanation. Understand anchors, groups, quantifiers instantly.
JWT Decoder
Decode JWTs instantly in your browser. See header, payload, claims. Private - never sent to a server.
Contrast Checker (WCAG)
Check color contrast for WCAG accessibility compliance. AA and AAA conformance levels.
JSON to YAML Converter
Convert JSON data to YAML format and vice versa
Cron Expression Explainer
Understand what a cron schedule expression means in plain English
HTML Entity Encoder
Encode and decode HTML entities
HTTP Status Code Reference
Look up HTTP status codes and their meanings
Chmod Calculator
Calculate Unix file permissions in numeric and symbolic notation
MIME Type Lookup
Look up MIME types by file extension or find extensions by MIME type. Comprehensive database.
URL Parameter Extractor
Extract query parameters from URLs into table or JSON format. Parse URLs instantly.
Font Size Converter
Convert between px, em, rem, pt, and percentage font sizes. Typography unit converter.
CSS Unit Converter
Convert px to vw, vh, rem instantly. Essential for responsive CSS. Set your viewport dimensions.
JWT Generator
Generate unsigned JWTs for testing. Build custom headers and payloads for development.
JSONPath Tester
Test JSONPath expressions against JSON data. Query and filter JSON with JSONPath syntax.
Base64 Image Viewer
Preview Base64-encoded images. Paste data URI or raw Base64 to render image.
HTTP Header Explainer
Understand HTTP headers in plain English. Paste headers and get clear explanations.
JWT Explainer
Decode and explain JWTs with security focus. Understand token claims and expiration.
HTTP Method Explainer
Reference for HTTP methods (GET, POST, PUT, DELETE). When to use each method.
Subdomain Extractor
Extract subdomain, domain, and TLD from any URL. Handles .co.uk, .com.au and complex TLDs.
Token Counter
Count tokens for GPT, Claude, and other LLM models