Convert & validate
Turn JSON into YAML, XML or CSV, inspect malformed SQL and detect configuration syntax errors without leaving the browser.
FREE DEVELOPER UTILITIES · NO LOGIN FOR PUBLIC TOOLS
All your essential developer tools.
One focused workspace.
Format data, compare code, design mock APIs, validate Swagger specifications, test expressions, inspect JWTs and automate repetitive work. Fast, readable tools made for real development workflows.
✓ Developer-friendly editors✓ Copy & download output✓ Responsive light / dark modes
TOOL DIRECTORY
Explore the toolkit
Choose the utility that fits your task. Each tool has its own dedicated workspace and usage tips.
Data & comparison
{ }Data ConverterValidate, beautify and convert JSON, XML, CSV and YAML in a side-by-side developer workspace with syntax highlighting and copy.Open workspace →≠Compare TextCompare text and structured data with character-level highlights, added/deleted line counts, and ignore value or whitespace options.Open workspace →SQLSQL StudioFormat and syntax-check MySQL, PostgreSQL, SQLite and SQL Server queries with readable errors. Queries are never executed.Open workspace →
APIs & authentication
↗API PlaygroundCreate and validate mock API requests with strict header, parameter and body matching; generate cURL and Postman collections.Open workspace →APIOpenAPI StudioCreate Swagger/OpenAPI YAML or JSON, validate schemas and references, preview API documentation and inspect endpoints.Open workspace →JWTJWT DebuggerDecode JWT headers and claims, inspect expiry, validate HS256/RS256 signatures and check issuer/audience in your browser.Open workspace →
Encoding & text
.*Regex TesterTest JavaScript regular expressions with match highlighting, groups, flags, replace previews and timeout protection.Open workspace →64Base64 & URL ToolsEncode and decode Unicode text using Base64, Base64URL, URL component or full URL with validation and copy.Open workspace →#Hash GeneratorGenerate MD5, SHA-256 and SHA-512 hashes from text or a local file directly in your browser.Open workspace →
Dates & automation
⏱Time ConverterConvert Unix seconds and milliseconds to ISO/UTC/local dates and compare world time zones in one workspace.Open workspace →*/Cron BuilderBuild and validate cron schedules, select a timezone, use presets and preview upcoming run times.Open workspace →▦QR Code GeneratorCreate QR codes for URLs and text with customizable size, colors and error correction; download as PNG or SVG.Open workspace →
Built for practical day-to-day engineering
Build & debug APIs
Create workspace-scoped API mocks, test contract matching, share reproducible cURL commands and validate OpenAPI documentation.
Encode & generate
Inspect JWT claims, test regular expressions, generate cryptographic hashes and share URLs as QR images.
Frequently asked questions
Can I use the tools without signing up?
Yes. The public developer tools do not require an account. The API Playground creates a browser-scoped workspace; the analytics dashboard is administrator-only.
Do the tools execute SQL queries or API specifications?
No. The SQL Studio checks syntax and formatting without connecting to a database. OpenAPI Studio validates and previews documentation without executing endpoint requests.
Does the site work on phones?
Yes. Each tool uses responsive layouts and accessible controls, though a desktop provides more space for multi-pane editors.