Technical Writing for Developers: Documentation That Gets Read

You can write brilliant code that nobody can use because the documentation is impenetrable. Or you can write average code with excellent docs that becomes everyone’s go-to solution.

Documentation is a multiplier. These principles help you write docs that work.

Know Your Audience

Different readers need different docs:

Tutorials (learning-oriented): “Follow these steps to build X”

• For newcomers
• Hand-holding is okay
• Complete, working examples
• Progressive complexity

How-to Guides (task-oriented): “How to do X”

• For users with specific goals
• Assume basic familiarity
• Direct and practical
• Problem → solution format

Reference (information-oriented): “X works like this”

• For experienced users
• Complete and accurate
• Consistent structure
• Searchable

Explanation (understanding-oriented): “Why X works this way”

• For curious users
• Background and context
• Design decisions
• Trade-offs discussed

Start with the Problem

Don’t start with your solution. Start with what the reader is trying to do:

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❌ Bad:
# MyLib API

MyLib uses a functional composition pattern with monadic 
error handling to provide type-safe data transformations.

✅ Good:
# MyLib: Transform Data Without the Boilerplate

Transform arrays, objects, and async data with a simple, 
chainable API. No more nested loops or try-catch blocks.

```javascript
// Before: 15 lines of error-prone code
// After:
const result = transform(data)
  .filter(isValid)
  .map(normalize)
  .get();

✅ Good:

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import { MyClient } from 'mylib';

const client = new MyClient({
  apiKey: process.env.MY_API_KEY,
  // Optional: customize timeout
  timeout: 5000,
});

// Verify connection
const status = await client.ping();
console.log(status); // { ok: true, latency: 42 }

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import { process } from 'mylib';
const result = process(data);

Configuration

Customize behavior with options:

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const result = process(data, {
  strict: true,
  format: 'json',
});

Advanced Usage

For complex scenarios, use the streaming API…

Common causes:

• API key copied incorrectly (check for trailing spaces)
• Key expired (keys expire after 90 days)
• Wrong environment (staging key used in production)

Basic Usage

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import { MyLib } from 'mylib';
const lib = new MyLib();

API Reference

process(data, options)

Transform input data according to rules.

Parameters:

Returns: ProcessedData

Throws: ValidationError if data is invalid

Test your examples in CI. Broken examples break trust.

Write for Search

People find docs through search. Include terms they’ll search for:

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# Handling Timeouts

When requests take too long (timeout errors, ETIMEDOUT, 
request timeout), use the `timeout` option:

Think: “What would I search for if I had this problem?”

Version Your Docs

Docs for v2 shouldn’t confuse v1 users:

Or use version selectors in your doc site.

The README Formula

A good README follows this pattern:

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# Project Name

One-sentence description of what it does.

## Features

- Feature 1
- Feature 2
- Feature 3

## Installation

```bash
npm install project-name

Quick Start

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// Minimal working example

Documentation

Link to full docs.

Contributing

How to contribute.

License

MIT