reverse-api-engineer

<div align="center"> <img src="https://raw.githubusercontent.com/kalil0321/reverse-api-engineer/main/assets/reverse-api-banner.png" alt="Reverse API Engineer Banner"> <br><br> <a href="https://pypi.org/project/reverse-api-engineer/"><img src="https://img.shields.io/pypi/v/reverse-api-engineer?style=flat&color=e50d75&labelColor=1f1f1f" alt="PyPI"></a> <a href="https://www.python.org/downloads/"><img src="https://img.shields.io/badge/python-3.11+-e50d75?style=flat&labelColor=1f1f1f" alt="Python"></a> <a href="https://opensource.org/licenses/MIT"><img src="https://img.shields.io/badge/license-MIT-e50d75?style=flat&labelColor=1f1f1f" alt="License"></a> </div>

Reverse API Engineer

Turn websites into APIs. Browse (or let an agent browse), and get a clean, typed client for the endpoints the site actually uses.

<p align="center"> <img src="https://raw.githubusercontent.com/kalil0321/reverse-api-engineer/main/assets/rae-autoscout.gif" alt="Agent Mode Demo"> <br> <em>Agent mode</em> </p>

<p align="center"> <img src="https://raw.githubusercontent.com/kalil0321/reverse-api-engineer/main/assets/reverse-api-engineer.gif" alt="Manual Mode Demo"> <br> <em>Manual mode</em> </p>

How it works

1. You give it a website and a goal ("fetch all Apple jobs").
2. A browser visits the site, either driven by you or by an AI agent.
3. Network traffic is captured to a HAR file.
4. Claude reads the traffic and writes you a working API client (Python, JS, or TS).

No more manually opening DevTools, copying cURL commands, and gluing together a client.

Install

uv tool install reverse-api-engineer   # or: pip install reverse-api-engineer
playwright install chromium

Quick start

reverse-api-engineer
> fetch all apple jobs from their careers page

# Browser opens. Navigate, interact, close when done.
# → ./scripts/apple_jobs_api/  (api_client.py, README.md, example_usage.py)

Cycle modes with Shift+Tab:

Agent mode providers:

• •auto (default): Playwright MCP, single workflow for browsing + reverse engineering.
• •chrome-mcp: drives your real Chrome so you keep existing sessions/cookies. Requires Chrome 146+ and Node.js 20.19+.
• •agent-browser: Vercel agent-browser CLI (not a Reverse API Engineer browser MCP server). At session start RAE uses whatever agent-browser is already on PATH, otherwise runs `npm install -g <pin>` (same pin as config / RAE_AGENT_BROWSER_PACKAGE), prints a yellow notice, validates with `--help`, and only then falls back to `npx -y <pin>` if npm cannot install. Prompts embed the resolved shell prefix alongside `skills get core --full`, `skills list`, HAR phases, cloud notes from agent_browser_notes. Tune with agent_browser_npx_package (optional), env RAE_AGENT_BROWSER_*. First Chromium fetch: `agent-browser install` (add --with-deps on trimmed Linux).

Optional sanity checks:

agent-browser doctor --offline --quick || true
agent-browser skills list >/dev/null

Configuration

Settings live in ~/.reverse-api/config.json and can be edited via /settings in the CLI:

{
  "agent_provider": "auto",
  "agent_browser_npx_package": "agent-browser@0",
  "agent_browser_notes": "",
  "claude_code_model": "claude-sonnet-4-6",
  "collector_model": "claude-sonnet-4-6",
  "opencode_model": "claude-sonnet-4-6",
  "opencode_provider": "anthropic",
  "copilot_model": "gpt-5",
  "cursor_model": "composer-2.5",
  "output_dir": null,
  "output_language": "python",
  "real_time_sync": true,
  "sdk": "claude"
}

• •Models: Sonnet 4.6 (default), Opus 4.6 (most capable), Haiku 4.5 (fastest). For OpenCode see models.dev.
• •SDK: claude (default), opencode, cursor, or copilot (GitHub Copilot).
• •Output language: python, javascript, or typescript.

CLI

Slash commands inside the CLI:

• •/settings: configure model, SDK, agent provider, and sync settings.
• •/history: list past runs with timestamps, costs, and status.
• •/messages <run_id>: view detailed message logs for a run.
• •/help (alias: /commands): show the command list.
• •/exit (alias: /quit): leave the CLI.

Scriptable subcommands (pipe to jq):

reverse-api-engineer agent --prompt "capture the public jobs api" \
  --url https://example.com/jobs --json | jq

reverse-api-engineer list --json
reverse-api-engineer show <run_id> --json
reverse-api-engineer run <run_id> --file api_client.py \
  --no-interactive --auto-install -- --org acme

Pass --no-interactive (and/or --json) to skip prompts. With --json, stdout is one JSON document and logs go to stderr.

agent --json schema

Exit codes

For run, the exit code is the underlying script's return code on success, 1 if no script was found, or non-zero if --no-interactive would have had to prompt.

Output locations

• •~/.reverse-api/runs/scripts/{run_id}/: permanent storage
• •./scripts/{descriptive_name}/: local copy with a readable name
• •Collector: ./collected/{folder_name}/ (items.json, items.csv, README.md)

Caveats

• •Generated code runs locally via Claude Code, so review before executing.
• •Sites with aggressive bot detection may block capture or require manual interaction.

Development

git clone https://github.com/kalil0321/reverse-api-engineer.git
cd reverse-api-engineer
uv sync
uv run reverse-api-engineer

Build: ./scripts/clean_build.sh. Requires Python 3.11+, Playwright browsers, and an API key for agent mode.

License

MIT. See LICENSE.