Developer Tools Hub

Free, secure, and powerful development tools to help with testing and development tasks.

No registration required • No data stored • Open source

FCM Push Notification Tester

Test Firebase Cloud Messaging push notifications by sending test messages to devices. Perfect for mobile app developers testing push notification functionality.

Start Testing FCM
QR Code Generator

Generate QR codes for URLs quickly and easily. Perfect for sharing links, testing mobile apps, or creating marketing materials with downloadable QR codes.

Generate QR Code
OAuth Access Token Generator

Generate OAuth access tokens for Azure AD applications using client credentials flow. Essential for API testing and development workflows.

Generate Token
JSON Formatter & Validator

Format (pretty-print) or minify JSON instantly. Validate JSON syntax and copy the formatted result. Fast, secure, and free.

Format JSON
Miscellaneous Tools

UNIX time converter, URL encode/decode, and Base64 encode/decode utilities. Fast in-browser conversions.

Open Misc Tools
About These Developer Tools

These free developer tools are created to help the developer community with useful, secure, and easy-to-use solutions for common development tasks.

  • FCM Tester: Enter your Firebase server key and device token to send test push notifications instantly
  • QR Generator: Input any URL to generate a high-quality, downloadable QR code for free
  • Access Token Generator: Use your Azure AD app credentials to generate OAuth tokens for API testing
  • JSON Formatter & Validator: Paste JSON to pretty-print, minify, validate syntax, and color-highlight data types (strings, numbers, booleans, null) with one click
  • Misc Tools: Convert UNIX timestamps (UTC/local), URL encode/decode text, and Base64 encode/decode content entirely in the browser with no data sent to the server
Security Features
  • • No data storage - your information is never saved
  • • Client-side processing where possible
  • • HTTPS encryption for all communications
  • • No registration or account creation required
Developer Benefits
  • • Fast and responsive interface
  • • Built for developers by a developer
  • • Mobile-friendly responsive design
  • • Completely free to use
About the Developer

Udaiappa Ramachandran (Udai) is a passionate software developer with expertise in web development, cloud technologies, mobile app development and developer tools. These tools are created to give back to the developer community and provide free, reliable solutions for common development tasks.

Technologies Used
ASP.NET Core 9 C# 13 Bootstrap 5 jQuery Font Awesome Agent Sonnet-4 Agent GPT-5

AI assistance provided by Agents Sonnet-4 and GPT-5 during content and refinement.

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