Free Developer Tools - Code, Debug & Ship Faster
Spending too much time on boilerplate and debugging? Our free developer tools help you format data, test endpoints, explain code, generate SQL, and create documentation — all in your browser with zero setup. Ship cleaner code faster without switching between desktop apps.
API Tester
Send REST API requests with custom headers, body, and params. View structured responses.
Code Explainer
Get line-by-line breakdowns of code logic, syntax, and purpose in plain language.
Code Refactorer
Refactor code for readability, performance, and maintainability with side-by-side diffs.
CSS Gradient Generator
Design linear, radial, and conic gradients with a visual editor and copy the CSS.
HTML Previewer
Write HTML/CSS/JS and see the rendered output alongside the editor in real time.
JSON Formatter & Validator
Validate syntax, beautify structure, and navigate JSON in a collapsible tree view.
Newsletter Curator
Compile and organize newsletter content with topic suggestions and draft text.
Product Description Generator
Write e-commerce product listings with features, specs, and benefit-focused copy.
README Generator
Build structured README.md files with project overview, installation, and usage examples.
Regex Tester
Test regular expressions with real-time match highlighting and a quick-reference cheat sheet.
Resume Builder
Build ATS-friendly resumes with structured sections and multiple professional templates.
SQL Generator
Describe queries in plain English and get formatted SQL with proper joins and clauses.
Uptime Monitor
Track website availability with downtime alerts, status pages, and incident history.
URL Shortener
Create short links with custom aliases, click analytics, and QR code generation.
Web Analyzer
Run technical audits on any URL covering SEO, performance, and accessibility with scored reports.
About Our Developer Tools - Code, Debug & Ship Faster
ToolmetryAI's developer tools are built for programmers who want to move fast without cluttering their workflow. Format and validate JSON with error highlighting, test REST APIs with custom headers and payloads, or debug regular expressions with real-time match previews. Need SQL? Describe what you want in plain English and get a syntactically correct query. Refactoring legacy code? Paste it in and receive a cleaner, more maintainable version with side-by-side diffs. You will also find a visual CSS gradient builder, a live HTML/CSS/JS previewer, a README generator that structures your GitHub repos, and a URL shortener with click analytics. Every tool is browser-based, free, and requires no installation — so you can open a tab, get your answer, and get back to building.