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Reverse API Engineer

Reverse API Engineer is an open-source Python CLI that captures a website’s network traffic in a HAR file while a person or AI agent browses, then uses a configured model to identify endpoints and generate a typed API client.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Reverse API Engineer — OpenViST project profile in Browser Agents.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when a website’s browser requests can support a repeatable data or API workflow, and you want a generated typed client rather than manually assembling requests from DevTools.

Who it is for

  • Developers who want reusable clients for endpoints observed during website browsing.
  • People who need to inspect HAR traffic and document website requests and patterns.
  • Users who want an agent to navigate a site toward a stated data-gathering goal.

Documented uses

  • Capture requests generated while interacting with a website.
  • Generate an API client from observed endpoint traffic in a selected programming language.
  • Regenerate a client using a previous capture.
  • Collect structured JSON or CSV data using the collector mode’s web search and fetch.
Before you choose

Requirements & limits

The project is a public GitHub repository licensed under MIT. Its README specifies Python 3.11 or later and supported installation platforms of Linux, Apple Silicon macOS and 64-bit Windows.

  • Manual mode uses a local Playwright browser and requires the optional manual extra plus Chromium; agent mode uses browser tooling launched through npx and needs no extra Python packages.
  • Chrome MCP drives a real Chrome session and requires Chrome 146+ and Node.js 20.19+.
  • The configured model reads captured HAR traffic to produce the client; output language is configurable.
  • The documented workflow generates client files, including a README and example usage, in an output directory.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Install Reverse API Engineer for manual browsing

Set up the CLI and its optional Playwright-based manual browser mode.

Before you start

  • Python 3.11 or later.
  • A supported installation platform: Linux, Apple Silicon macOS or 64-bit Windows.
  • uv or pip.

Steps

  1. Install the CLI with the command below or the command below.

    Documented command
    uv tool install reverse-api-engineer
    Documented command
    pip install reverse-api-engineer

  2. Install the manual extra with the command below or the command below.

    Documented command
    uv tool install "reverse-api-engineer[manual]"
    Documented command
    pip install "reverse-api-engineer[manual]"

  3. Install Chromium with playwright install chromium.

Expected outcome

The CLI and the documented Playwright Chromium dependency for manual mode are installed.

Guide limitations

  • This guide covers installation only; it does not run a capture or generate a client.
  • Intel macOS and 32-bit Windows are not supported installation paths.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
11 October 2026
Original website title
kalil0321/reverse-api-engineer · Official homepage title · retained in its source language
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