Free Open Source Developer Tools
that don't get in your way.
Free, open-source, and privacy-focused utilities for developers. All tools run entirely in your browser — your data never leaves your machine.
JSON Converter
Format, validate, and minify JSON with tree and table views.
Text Converter
Transform case, clean whitespace, and encode/decode strings.
Diff Viewer
Compare two texts side-by-side and highlight differences.
JWT Decoder & Signer
Inspect JWT tokens and generate new ones with a secret key.
Mock API Generator
Create stateless dummy API responses with common presets.
Why Choose Our Open Source Developer Tool Suite?
100% Client-Side
Security and privacy are at the heart of our developer tools. We don't have a backend database for your data. Everything happens right in your browser using modern JavaScript APIs, keeping your secrets, API keys, and sensitive JSON data safe from prying eyes.
Developer First Experience
Built by developers, for developers. We prioritize clean interfaces, keyboard shortcuts, and smart defaults to help you work faster. No distractions, no ads, and no complicated setup — just the utilities you need, when you need them.
Free & Open Forever
Our mission is to provide high-quality online utilities to the community. No subscriptions, no paywalls, and no account requirements. We believe that essential tools for building the web should be accessible to everyone, everywhere.
A Comprehensive Toolkit for JSON, Text & Dev Utilities
In today's fast-paced development environment, having a reliable set of utilities can save hours of frustration. Whether you are a frontend engineer debugging a complex state, a backend developer verifying authentication tokens, or a DevOps specialist building automation scripts, gbkarki.com.np offers a unified platform to handle common tasks with precision.
Our suite includes everything from a high-performance JSON formatter to a robust JWT decoder. We understand that developers often need to jump between multiple tools. By consolidating these utilities into a single, high-performance web application, we eliminate the need for dozens of browser tabs and insecure third-party sites.
Mastering JSON Data Management
JSON (JavaScript Object Notation) is the lingua franca of the web. However, working with raw, unformatted JSON can be nearly impossible. Our JSON Converter doesn't just beautify your code; it provides deep validation and structural insights. You can instantly switch between tree, table, and raw views to better understand your data's hierarchy.
- Instant validation against standard JSON schemas.
- Minification for optimizing network payloads and storage.
Learn more about the JSON standard and its best practices.
Security & Identity Verification
Security is never an afterthought. When you are debugging authentication flows, you need to see exactly what is inside your tokens. Our JWT Decoder & Signer provides a visual breakdown of your JSON Web Tokens, highlighting the header, payload, and signature components.
Unlike other decoders that send your tokens to a server, our tool processes the data entirely in your local session. This means your sensitive claims and secret keys never touch the internet. We also offer a cryptographically secure Password Generator that uses the Web Crypto API to ensure your credentials are truly random and resistant to brute-force attacks.
Explore the JWT documentation to understand how tokens are structured.
Advanced Text & String Manipulation
From comparing environment variables to cleaning up dirty data exports, text manipulation is a daily task. Our Diff Viewer uses advanced algorithms to identify additions, deletions, and subtle character-level changes between two text blocks.
The Text Converter utility provides a versatile playground for case transformations (camelCase, snake_case, PascalCase), URL encoding, Base64 processing, and whitespace cleaning. It's the Swiss Army knife for string data that every developer needs in their bookmarks.
Frequently Asked Questions
Is my data shared with any third party?
Absolutely not. All processing happens locally in your browser. We do not use any tracking cookies or third-party analytics that capture your input data. Your privacy is our top priority.
Can I use these tools for commercial projects?
Yes! gbkarki.com.np is free for personal, educational, and commercial use. We encourage teams to use our tools to improve their development velocity.
Do you support offline mode?
Yes, since our tools are built using client-side technologies, once the page is loaded, most functionalities will continue to work without an active internet connection.
How can I request a new tool?
We are always looking to expand our toolkit. You can send your suggestions through our Support page or connect with us on GitHub.
Help us grow the community
If you find these tools useful, please share them with your fellow developers. Together, we can build a better web.