APITester Agent-Driven API Testing

Test API endpoints and document responses. Define tests in plain English, run them, get formatted results. Agent-driven Postman alternative.

Test API endpoints and document responses. Define tests in plain English, run them, get formatted results. Agent-driven Postman alternative.

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Define API tests in plain English. Run them. Get documented results.

Usage

tests:
  - name: "Get all users"
    method: GET
    url: "https://api.example.com/users"
    expect:
      status: 200
      body_contains: "users"

  - name: "Create user"
    method: POST
    url: "https://api.example.com/users"
    body:
      name: "Test User"
      email: "[e-mail]"
    expect:
      status: 201

Test Results

API Test Results — 2026-02-28
✅ Get all users        200 OK    145ms
✅ Create user          201 OK    230ms
❌ Delete user          403 FORBIDDEN
✅ Update user          200 OK    189ms

Pass: 3/4 (75%) | Avg response: 188ms

Features

• YAML test definitions — no code required
• Variable chaining — use response values in subsequent requests
• Environment configs — dev, staging, prod
• Auto-documentation — generates API docs from test results
• Parallel execution — run independent tests concurrently
• Report generation — HTML, JSON, or markdown

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⚠️ Disclaimer

This software is provided "AS IS", without warranty of any kind, express or implied.

USE AT YOUR OWN RISK.

• The author(s) are NOT liable for any damages, losses, or consequences arising from the use or misuse of this software — including but not limited to financial loss, data loss, security breaches, business interruption, or any indirect/consequential damages.
• This software does NOT constitute financial, legal, trading, or professional advice.
• Users are solely responsible for evaluating whether this software is suitable for their use case, environment, and risk tolerance.
• No guarantee is made regarding accuracy, reliability, completeness, or fitness for any particular purpose.
• The author(s) are not responsible for how third parties use, modify, or distribute this software after purchase.

By downloading, installing, or using this software, you acknowledge that you have read this disclaimer and agree to use the software entirely at your own risk.

DATA DISCLAIMER: This software processes and stores data locally on your system. The author(s) are not responsible for data loss, corruption, or unauthorized access resulting from software bugs, system failures, or user error. Always maintain independent backups of important data. This software does not transmit data externally unless explicitly configured by the user.

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Support & Links

🐛 Bug Reports	[e-mail]
☕ Ko-fi	ko-fi.com/theshadowrose
🛒 Gumroad	shadowyrose.gumroad.com
🐦 Twitter	@TheShadowyRose
🐙 GitHub	github.com/TheShadowRose
🧠 PromptBase	promptbase.com/profile/shadowrose

Built with OpenClaw — thank you for making this possible.

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