Free Online Tools for Developers
JSON workspace, JWT decoder, Base64, URL encoder, TypeScript generator, and code minifiers — no setup, no account.
Essential Tools for Developers
Why These Tools?
Every developer needs quick access to utilities for decoding tokens, encoding strings, formatting data, and converting between formats. These browser-based tools eliminate the need for command-line gymnastics or installing packages.
The JSON Workspace includes 15 tools: validator, formatter, minifier, schema generator, JSONPath tester, repair tool, and converters to TypeScript, CSV, YAML, XML, Python, and Java.
The JWT Decoder reveals token headers and claims without requiring the secret key — essential for debugging authentication. The Base64 and URL Encoder handle the encoding tasks that come up constantly in API development.
The Secret Generator produces cryptographically random passwords, API keys, and JWT secrets directly in your browser — more secure than pasting into online tools that log inputs.
All Recommended Tools (17)
Frequently Asked Questions
Can I decode a JWT without the secret key?
Yes. JWT decoding only requires the base64url decoding of the header and payload. Signature verification requires the secret, which the decoder deliberately does not request.
What is the fastest way to generate TypeScript interfaces from an API?
Paste an example JSON response into JSON to TypeScript. It instantly generates named interface definitions for all nested objects.
How do I minify CSS for production?
Paste your CSS into the CSS Minifier. It removes comments and whitespace, reducing file size typically 20-40%.
What length should my API keys be?
32 characters (hexadecimal) is standard for API keys. 64 characters is appropriate for HMAC secrets and JWT signing keys.