How to Document Code Properly

The practices that make your codebase readable six months from now - not just today.

Documentation is the thing every team says matters and almost none do consistently. This guide covers the practices that work in real production codebases - not academic ideals, but the minimum viable documentation that saves hours of onboarding and debugging.

No fluff. Production-grade answers from engineers who build this every day.

Why Most Code Documentation Fails (And What to Do Instead)

The two failure modes: too much and too little. Too little means no one knows why a function exists. Too much means the comments are wrong three weeks after the code changed. The target: documentation that answers 'why', not 'what'. Code already shows what it does. Comments, READMEs, and ADRs should explain decisions, constraints, and gotchas - the context that disappears the moment the original engineer leaves.

At Valletta Software, we focus on:

Inline comments: explain WHY not WHAT - // retry because downstream API is flaky before 9am UTC

JSDoc / docstrings: for all public functions, params, return types, and thrown errors

README per service: purpose, how to run locally, env variables, external dependencies

ADR (Architecture Decision Records): record decisions with context and alternatives considered

API docs: OpenAPI / Swagger generated from code not maintained separately

Changelog: KEEP A CHANGELOG format - human-readable per release

Onboarding doc: how to set up and ship your first PR - updated by every new joiner

The Tools That Actually Get Used

If documentation requires a separate tool nobody opens, it won't happen.

We give you more than just people. We give you top performers who drive results.

JSDoc / TSDoc - inline auto-generated lives with the code

README.md + docs/ folder - Markdown in the repo versioned with the code

OpenAPI / Swagger - auto-generated from NestJS FastAPI or Django decorators

ADR format - lightweight Markdown files in /docs/decisions/

Docusaurus or Mintlify - for public-facing or internal dev portals

Linear / Notion - for product-level context not code-level docs

Automated reminders: PR template with Did you update the README / ADR?

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How to Document Code Properly - With Engineers Who Actually Do It

Documentation is a habit not a sprint task. Our engineers write ADRs maintain READMEs and generate API docs as part of every PR - not as a cleanup task before handoff.

Our engineers are trained in today's most powerful tools - Copilot, Claude, Cursor, and AI-assisted tooling - and use them daily to move faster without cutting corners.

Choose from a solo dev, mini team, or full squad. All powered by AI and ready to build from day one.

Let's keep it simple.

Our Node.js engineers document every API endpoint, write ADRs for every architectural decision, and maintain READMEs that new team members actually use.

How we work