Developer Tools
Free online developer tools for web development. Format code, convert data, generate code snippets, and more essential utilities for developers.
API Tester
Test and debug API endpoints
Code Converter
Convert code between different programming languages
JWT Decoder
Decode and validate JWT tokens
YAML Converter
Convert between YAML and other formats
Data Generator
Generate mock data for testing
Unicode Viewer
View and search Unicode characters
Hash Calculator
Calculate hash values for text
Code Beautifier
Format and beautify code
Mining Calculator
Calculate cryptocurrency mining profitability and hash rates
How It Works
Boost your productivity in four simple steps.
Select a Tool
Pick the developer utility you need—API Tester, JWT Decoder, Code Beautifier and more.
Configure Options
Adjust settings such as HTTP method, code language, or formatting style to fit your workflow.
Run & Preview
Execute the tool in-browser and instantly preview results without leaving the page.
Export & Share
Copy, download or share the generated output and apply it directly in your project.
Perfect for Every Developer
Whether you're building APIs or polishing UI, our tools have you covered.
Rapid Debugging
Use the API Tester to validate endpoints and view responses in real time—no external clients needed.
Security Audits
Decode and verify JWTs to inspect headers, payloads, and signatures during authentication reviews.
UI Theming
Grab exact HEX / RGB values with the Color Picker and keep your design system consistent.