Developer Tools
31 free, browser-based tools for developers. Format code, decode JWTs, test regex, generate hashes, convert formats — all without uploading anything to a server.
JSON
JWT
Encoding
Code Formatting
Testing & Development
IDs & Hashing
Time & Date
Why these developer tools?
Developers waste hours every week on small tasks: formatting messy JSON, decoding a JWT to inspect claims, testing a tricky regex pattern, or converting between formats. These tools handle those tasks instantly — no installation, no signup, no data sent to any server.
Privacy by design
Every tool runs entirely in your browser using JavaScript, Web Crypto, and standard Web APIs. Your code, tokens, and credentials never leave your device. This matters when you're working with sensitive data like API keys, JWT secrets, or production config files.
Common use cases
- Debugging APIs: Format JSON responses, decode JWTs, test JSONPath
- Code review: Format SQL, XML, YAML, HTML, CSS, JS for readability
- Data conversion: JSON ↔ CSV, YAML ↔ JSON, timestamp ↔ date
- Testing: Regex patterns, cron expressions, hash verification
- Generating: UUIDs, MD5/SHA hashes, JWT tokens
All processing is local
The tools use modern browser APIs — Canvas for images, Web Crypto for hashing, DOMParser for XML/HTML — meaning you get real, accurate results without any server round-trips. Fast, private, and free.
Frequently Asked Questions
Are these developer tools free?
Yes, every tool is completely free. No signup, no limits, no paid tier.
Is my code uploaded to a server?
No. All tools run entirely in your browser. Your code, JSON, JWTs, and any other input never leave your device.
Which languages/formats are supported?
JSON, JWT, Base64, URL, HTML, SQL, XML, YAML, CSS, JavaScript, and more. See the full list above.
Can I use these tools offline?
Once the page loads, most tools work offline since all processing is client-side.
Do you have an API?
Not yet. All tools are browser-based and free to use directly.