In today's fast-paced tech world, developers are constantly seeking ways to streamline their workflows and reduce manual labor. One of the most tedious tasks in web development is reverse engineering APIs to understand their endpoints and interactions. But what if there was a tool that could automate this entire process? Enter Reverse-Api-Engineer, a groundbreaking CLI tool that captures browser traffic and automatically generates production-ready Python API clients. No more manual reverse engineering—just browse, capture, and get clean API code.
What is Reverse-Api-Engineer?
Reverse-Api-Engineer is a CLI tool created by kalil0321 that captures browser traffic and uses AI to generate Python API clients. This tool is built on Playwright with stealth mode for realistic browsing and uses Claude 4.5 to analyze traffic and generate clean Python code. It's trending now because it simplifies the process of reverse engineering APIs, making it accessible to developers of all skill levels.
Key Features
- Browser Automation: Built on Playwright with stealth mode for realistic browsing.
- Autonomous Agent Mode: Fully automated browser interaction using AI agents.
- HAR Recording: Captures all network traffic in HTTP Archive format.
- AI-Powered Generation: Uses Claude 4.5 to analyze traffic and generate clean Python code.
- Collector Mode: Data collection with automatic JSON/CSV export.
- Multi-SDK Support: Native integration with Claude and OpenCode SDKs.
- Interactive CLI: Minimalist terminal interface with mode cycling.
- Production Ready: Generated scripts include error handling, type hints, and documentation.
- Session History: All runs saved locally with full message logs.
- Cost Tracking: Detailed token usage and cost estimation with cache support.
- Tag System: Powerful tags for fine-grained control.
Use Cases
1. Rapid API Development
Developers can quickly generate API clients for any website they interact with. This speeds up the development process and reduces the time spent on manual reverse engineering.
2. Automated Data Collection
The Collector Mode allows developers to collect structured data from the web using natural language prompts. This is particularly useful for scraping and data mining tasks.
3. Cost-Efficient Development
By tracking token usage and providing cost estimates, developers can manage their resources more effectively. This is especially valuable when working with paid API models.
4. Seamless Integration
With support for multiple SDKs and a flexible configuration system, Reverse-Api-Engineer can be easily integrated into existing development workflows.
Step-by-Step Installation & Setup Guide
Using uv (recommended)
# Basic installation
uv tool install reverse-api-engineer
# With agent mode support (includes browser-use with HAR recording)
uv tool install 'reverse-api-engineer[agent]' --with 'browser-use @ git+https://github.com/browser-use/browser-use.git@49a345fb19e9f12befc5cc1658e0033873892455'
Using pip
# Basic installation
pip install reverse-api-engineer
# With agent mode support
pip install 'reverse-api-engineer[agent]'
pip install git+https://github.com/browser-use/browser-use.git@49a345fb19e9f12befc5cc1658e0033873892455
Post-installation
Install Playwright browsers:
playwright install chromium
Enhanced Pricing Support (Optional)
By default, Reverse API Engineer includes pricing data for the most common models (Claude 4.5, Gemini 3). For extended model coverage (100+ additional models including OpenAI GPT, Mistral, DeepSeek, and more), install with pricing extras:
# With uv
uv tool install 'reverse-api-engineer[pricing]'
# With pip
pip install 'reverse-api-engineer[pricing]'
REAL Code Examples from the Repository
Example 1: Basic Installation and Usage
# Basic installation
uv tool install reverse-api-engineer
# Launch the interactive CLI
reverse-api-engineer
This command installs the basic version of Reverse-Api-Engineer and launches the interactive CLI. The CLI provides a minimalist terminal interface where you can choose different modes (Manual, Engineer, Agent, Collector) using Shift+Tab.
Example 2: Generating an API Client
# Start the CLI
reverse-api-engineer
# Enter task description
> fetch all apple jobs from their careers page
# Browser opens, navigate and interact
# Close browser when done
After entering the task description, the browser opens. You can navigate and interact with the website. Once you close the browser, the AI automatically generates the API client and saves the scripts to ./scripts/apple_jobs_api/.
Example 3: Using Agent Mode
# Start the CLI and switch to agent mode
reverse-api-engineer
# Switch to agent mode using Shift+Tab
# Enter task description
> Click on the first job listing
# Agent automatically navigates and interacts
In Agent Mode, the tool uses AI agents to automatically navigate and interact with the website. The HAR is captured automatically, and the API client is generated without manual intervention.
Advanced Usage & Best Practices
- Use Tags for Fine-Grained Control: Tags like
@record-onlyand@codegenallow you to control the behavior of the tool during capture and generation. - Monitor Token Usage: Keep an eye on token usage and cost estimates to manage your resources efficiently.
- Regularly Update Playwright Browsers: Ensure you have the latest versions of Playwright browsers installed to avoid compatibility issues.
- Experiment with Different Modes: Each mode (Manual, Engineer, Agent, Collector) has its own strengths. Experiment with them to find the best fit for your workflow.
Comparison with Alternatives
| Feature/Tool | Reverse-Api-Engineer | Alternative 1 | Alternative 2 |
|---|---|---|---|
| Browser Automation | Yes | No | Partial |
| AI-Powered Generation | Yes | No | No |
| HAR Recording | Yes | No | No |
| Multi-SDK Support | Yes | No | No |
| Cost Tracking | Yes | No | No |
| Interactive CLI | Yes | No | No |
| Production Ready | Yes | No | No |
| Session History | Yes | No | No |
FAQ
Q: Is Reverse-Api-Engineer free to use? A: Yes, Reverse-Api-Engineer is open-source and free to use under the MIT license.
Q: Can I use it with other programming languages? A: Currently, Reverse-Api-Engineer generates Python API clients. Support for other languages may be added in the future.
Q: How accurate is the AI-generated code? A: The AI-generated code is highly accurate, but it's always a good idea to review and test the generated scripts.
Q: Does it work with all websites? A: Most websites, but some advanced bot-detection mechanisms may limit capture or require manual interaction.
Q: Can I contribute to the project? A: Absolutely! Contributions are welcome. Check the Contributing guide for details.
Conclusion
Reverse-Api-Engineer is a game-changing tool for developers looking to streamline their API development process. With its powerful features and user-friendly interface, it simplifies the task of reverse engineering APIs and generates production-ready code. Whether you're a seasoned developer or a beginner, this tool can significantly enhance your workflow. Ready to give it a try? Head over to the GitHub repository and start automating your API development today!
