AI Apps Script Documentation Generator Apps Script Gemini Code 25

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🚀 Apps Script + Gemini Mastery — Issue #25

AI Apps Script Documentation Generator

Transform any Google Apps Script project into professional documentation automatically using Gemini.

Generate README files, installation guides, inline documentation, API references, architecture diagrams, and user guides in seconds.

⭐ What You Will Build

In this issue, you’ll build an AI Documentation Generator that can:

📄 Generate professional README.md files

📝 Document every function

🧠 Explain complex code

📚 Create installation guides

🏗 Generate project architecture documentation

📖 Build developer guides

💬 Create user documentation

🧠 Why This Project Matters

Documentation is one of the most neglected parts of software development.

Developers love writing code…

Few enjoy documenting it.

This project automatically turns Apps Script projects into professional documentation suitable for GitHub.

🧩 Architecture

Apps Script files

↓

Apps Script collects project code

↓

Gemini analyzes project

↓

Apps Script creates documentation

↓

Google Docs + Markdown output

🧱 Step 1 — Menu

Code.gs

function onOpen(){

SpreadsheetApp.getUi()
.createMenu("AI Tools")
.addItem(
"AI Documentation Generator",
"showDocumentationSidebar"
)
.addToUi()

}

function showDocumentationSidebar(){

SpreadsheetApp.getUi().showSidebar(
HtmlService
.createHtmlOutputFromFile("Sidebar")
.setTitle("AI Documentation Generator")
)

}

🧱 Step 2 — Sidebar

Sidebar.html

<div style="font-family:Arial;padding:14px;">

<h2>AI Documentation Generator</h2>

<label>

Paste your Apps Script project

</label>

<textarea
id="code"
style="width:100%;height:250px;">
</textarea>

<button onclick="generate()">

Generate Documentation

</button>

<pre id="output"></pre>

<script>

function generate(){

document.getElementById("output").textContent=
"Generating documentation..."

google.script.run
.withSuccessHandler(res=>{

document.getElementById("output").textContent=
res

})
.generateDocumentation(
document.getElementById("code").value
)

}

</script>

</div>

🧱 Step 3 — Ask Gemini

DocumentationGenerator.gs

function generateDocumentation(code){

const prompt = `
You are a senior technical writer.

Analyze this Apps Script project.

Return JSON:

{

"title":"",

"description":"",

"features":[...],

"installation":[...],

"functions":[
{
"name":"",
"description":""
}
],

"usage":[...],

"architecture":"",

"readme":""

}

Code:

${code}

`

let result = callGemini(prompt,"")

result=result
.replace(/```json/g,"")
.replace(/```/g,"")

const docs=
JSON.parse(result)

return createDocumentation_(docs)

}

🧱 Step 4 — Create Documentation

DocumentationWriter.gs

function createDocumentation_(docs){

const doc=
DocumentApp.create(
docs.title
)

const body=
doc.getBody()

body.appendParagraph(docs.title)
.setHeading(
DocumentApp.ParagraphHeading.TITLE
)

body.appendParagraph(
docs.description
)

body.appendParagraph(
"Features"
)
.setHeading(
DocumentApp.ParagraphHeading.HEADING2
)

docs.features.forEach(item=>{
body.appendListItem(item)
})

body.appendParagraph(
"Installation"
)
.setHeading(
DocumentApp.ParagraphHeading.HEADING2
)

docs.installation.forEach(item=>{
body.appendListItem(item)
})

body.appendParagraph(
"Functions"
)
.setHeading(
DocumentApp.ParagraphHeading.HEADING2
)

docs.functions.forEach(f=>{

body.appendParagraph(
f.name
)

body.appendParagraph(
f.description
)

})

return doc.getUrl()

}

🧱 Step 5 — Generate README.md

ReadmeWriter.gs

function exportReadme_(docs){

DriveApp.createFile(
"README.md",
docs.readme,
MimeType.PLAIN_TEXT
)

}

🧪 Example

Paste an Apps Script project.

Automatically generate:

✅ README

✅ Installation Guide

✅ Function Reference

✅ Developer Guide

✅ User Guide

✅ Architecture Overview

📄 Example Output

AI Dashboard Builder

Features

  • Sidebar UI
  • Gemini Integration
  • Dashboard Builder

Installation

  1. Create Apps Script project
  2. Add API key
  3. Deploy

Functions

buildDashboard()

Creates dashboard.

callGemini()

Communicates with Gemini API.

🔥 Advanced Exercises

✅ Mermaid architecture diagrams

✅ Sequence diagrams

✅ Flowcharts

✅ Generate GitHub Wiki

✅ Produce JSDoc comments automatically

✅ Create CHANGELOG.md

✅ Generate CONTRIBUTING.md

✅ Generate LICENSE recommendations

🌟 Why This Project Is Different

Documentation is often the last thing developers do—but it’s one of the first things users see.

By combining Apps Script with Gemini, you can transform raw code into polished, professional documentation that improves collaboration, onboarding, maintainability, and open-source adoption.

🔜 Next Issue (#26)

AI Apps Script Unit Test Generator

Automatically generate:

  • unit tests
  • mock objects
  • test data
  • edge-case scenarios
  • regression tests

from existing Apps Script code, helping developers build more reliable automations and improve code quality with AI-assisted testing.