javascriptadvanced4 hr est.

Automated GitHub Code Reviewer

Build a GitHub App or Action that automatically reviews Pull Requests using OpenAI and comments on specific lines of code.

Editorial note

Written by TechIdea Curriculum Team

TechIdea Curriculum Team

Our engineers and educators design these projects to simulate real-world tasks and prepare you for technical interviews.

This guide is created to help beginners understand SEO, blogging, AI tools, and online growth in simple English. We focus on practical steps, original examples, and safe website growth methods.

Last updated: 2026-06-13

Before You Begin

1
Node.js
2
GitHub API
3
OpenAI

Project Architecture

Folder Structure

action/
├── index.js
└── action.yml

Data Flow

[GitHub PR Trigger] -> [Fetch Diff] -> [OpenAI Review] -> [Post PR Comment]

Source Code Breakdown & Implementation

Set up a GitHub Action repository.

Use @actions/github to get the context and octokit instance.

Runs automatically on PR creation.

Ignore very large diffs to save API costs.

Complete Solution Code

Compare your approach

Testing Checklist

• Open a PR with a bug
• Check if AI comments on it

Common Bugs

Bug: Token limits
Fix: Diffs can be huge. Chunk them or ignore non-source files.

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