A curated collection of 100+ online utilities to make developers' lives easier. Completely free and open source.

Available Tools

• JSON Utilities
  ^{JSON Formatter, Validator and Linter | Online Free DevTools}
• JSON Prettifier
  ^{JSON Formatter, Validator and Linter | Online Free DevTools}
• JSON Validator
  ^{JSON Validator - Check & Validate Your JSON Online}
• JSON Fixer
  ^{JSON Fixer - Automatically Correct JSON Errors}
• Password Generator
  ^{Secure, Strong & Random Password Generator | Online Free Devtools}
• Dockerfile Linter
  ^{Dockerfile Linter and Validator | Online Free DevTools}
• Date Time Converter
  ^{Date Time Converter | Online Free DevTools}
• More tools coming soon...

Quick Start

1. Clone the repository

   git clone https://github.com/yourusername/freedevtools.git
   cd freedevtools

2. Install dependencies

   cd frontend
   npm install

3. Run development server

   make run

4. Deploy

   make deploy

How to Test SEO for Your Project

Once your tool is partially or fully completed, you can run validation steps to identify any SEO issues.

Steps for Comprehensive SEO Testing

1. Open the AI Chat window in your IDE (such as Cursor or Copilot).
2. Select the relevant files for your tool—mainly the main source file, tools.ts (which contains configurations and details), and any subcomponents if applicable.
3. Attach the seo.md file.
4. Run this prompt:
   Go through all the attached files of this tool [tool name] and find any SEO issues based on the instructions provided in #seo.md file.
5. Wait for the analysis to complete, then fix any issues found.

Testing Specific Sections

If you want to test a particular section (for example, the meta description):

1. Attach all relevant files.
2. Run the prompt:
   Check the meta description of the tool [tool name] is valid based on seo.md file.

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Improving Results

If you find any SEO issues in your tool that are not addressed in seo.md, you can improve the file by adding those issues along with validation methods.
Make sure to follow the same format for any new sections you

SEO testing tools

• https://tools.backlinko.com/seo-checker
• https://pagespeed.web.dev/analysis
• https://seositecheckup.com/
• https://rankmath.com/tools/seo-analyzer/

License

This project is licensed under the MIT License - see the LICENSE file for details.

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Related Projects

LiveReview - I'm building a private AI code review tool that runs on your LLM key (OpenAI, Gemini, etc.) with flat, no-seat pricing — designed for small teams. Check it out, if that's your kind of thing.

LiveReview helps you get great feedback on your PR/MR in a few minutes.

Saves hours on every PR by giving fast, automated first-pass reviews. Helps both junior/senior engineers to go faster.

If you're tired of waiting for your peer to review your code or are not confident that they'll provide valid feedback, here's LiveReview for you.

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⭐ Star This Repository

If you find these tools helpful, please consider giving us a ⭐ star on GitHub! It helps us reach more developers who could benefit from these utilities.

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Contributing

We welcome contributions! Here's how you can help:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-tool)
3. Make your changes
4. Commit your changes (git commit -m 'Add amazing new tool')
5. Push to the branch (git push origin feature/amazing-tool)
6. Open a Pull Request

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Made with ❤️ by the developer community