Developer Utilities
42 toolsA grab-bag of everyday developer tools: UUID generation, QR code creation, regex testing, SQL formatting, mock data generation, environment-variable parsing, and more. These are the utilities you reach for constantly but do not want to write yourself every time.
Environment Variable Diff
Compare two .env files and spot missing keys or changed values between environments.
Dockerfile Linter
Check Dockerfiles for common reproducibility, security, and maintainability issues.
Kubernetes YAML Validator
Validate Kubernetes YAML for basic required fields, deployment selectors, and risky image tags.
SQL Query Explainer
Break SQL queries into readable clauses so joins, filters, grouping, and ordering are easier to inspect.
UUID Generator
Generate UUID v1, v4, and v5 identifiers
GUID Generator
Generate Windows-style GUIDs for .NET and COM applications
Token Counter
Count tokens for GPT-4, Claude, Llama, and Gemini models with cost estimates
README Generator
Fill in project details and generate a professional GitHub README.md with badges, features, and more
Nginx Config Generator
Generate nginx server block configs for static sites, reverse proxies, Node.js apps, and PHP with SSL support
.htaccess Generator
Generate Apache .htaccess rules for HTTPS redirects, caching, security headers, and more
Docker Compose Validator
Validate and analyse docker-compose.yml files — checks syntax, services, ports, and networks
URL Parser
Parse any URL into its components: protocol, hostname, port, path, query params, and hash
cURL to Code
Convert cURL commands into JavaScript fetch, Axios, Python requests, or PHP code
.gitignore Generator
Generate a .gitignore file for your project by selecting languages, frameworks, and editors
Meta Tag Generator
Generate HTML meta tags for SEO, Open Graph (Facebook), and Twitter Cards
API Request Tester
Test HTTP API endpoints with custom headers and request body
HTTP Header Viewer
Inspect and decode HTTP request and response headers
IP Lookup Tool
Look up geolocation, ISP, and details for any IP address
User Agent Parser
Parse and analyze browser user-agent strings
DNS Lookup
Query DNS records including A, AAAA, MX, CNAME, and TXT
Port Checker
Check if a port is open or closed on any host
QR Code Generator
Generate QR codes for URLs, text, WiFi, and more
QR Code Reader
Scan and decode QR codes from images or your camera
Mock Data Generator
Generate realistic fake data — names, emails, addresses, dates, UUIDs — as JSON or CSV for testing and prototyping
SQL Formatter
Format and prettify SQL queries, or minify them to a single line. Keywords are automatically uppercased.
XML Formatter and Validator
Format, minify, and validate XML documents in your browser. Detects syntax errors and shows the line that failed.
JSON Schema Generator
Paste a sample JSON object and instantly get a JSON Schema. Includes a Power Automate mode for the Parse JSON action.
.env File Parser
Parse .env files into a table or JSON, or convert a JSON object back to .env format. Strips comments and handles quoted values.
Aspect Ratio Calculator
Calculate, simplify, and scale aspect ratios for images, videos, and UI elements. Includes common presets like 16:9, 4:3, and 1:1.
Prompt Builder
Build structured LLM prompts with system, user, and assistant sections — copy as text or JSON
AI Model Comparator
Side-by-side comparison of major LLM models — context window, pricing, strengths, and knowledge cutoff
Prompt Diff
Compare two LLM prompt versions side by side — see added, removed, and unchanged lines at a glance
Percentage Calculator
Three percentage calculators in one: X% of Y, X is what % of Y, and % change from X to Y
SQL to MongoDB
Translate SQL WHERE clauses to MongoDB filter syntax — supports =, !=, IN, LIKE, AND, OR, NULL checks
DB Schema Visualizer
Paste CREATE TABLE SQL and visualize your database schema — tables, columns, types, and foreign key relationships
GitHub Actions Validator
Validate GitHub Actions workflow YAML — check required keys, step definitions, trigger formats, and common mistakes
Kubernetes Linter
Lint Kubernetes manifest YAML — validate required fields, container specs, resource limits, and best practices
Makefile Generator
Generate Makefiles for Node.js, Python, Go, Rust, and Docker projects — pick targets, set variables, download
DevHexDraw
Free browser-based diagram editor for architecture diagrams, flowcharts, and system sketches — hand-drawn style, infinite canvas, no sign-up
Mind Map
Visual brainstorming tool. Build a mind map with branches and ideas, export to Markdown or JSON
Dev Task List
A dopamine-releasing developer task manager with categories, priorities, subtasks, progress tracking, and satisfying completion animations
Penalty Shootout
Take a break and play a penalty shootout game. Aim inside the goal, charge your shot, and try to beat the keeper. 5 kicks per round.