How to write readable backend code — Basic

Misc / Other Coding & architecture practices

Use descriptive names, small functions, early returns, and comments only for non-obvious business rules.

Learn: Readable code reduces bugs in team settings. Prefer const, async/await over nested callbacks, and functions under ~30 lines. Rename until intent is obvious without comments.

Supplementary examples

Extract validation helper

function requireString(value, field) {
  if (typeof value !== "string" || !value.trim()) {
    const err = new Error(`${field} is required`);
    err.status = 400;
    throw err;
  }
  return value.trim();
}

Course example

// Prefer explicit names
async function listActiveUsers() {
  return knex("users").where({ is_active: true });
}

// Prefer early return over deep nesting
if (!req.body.name) {
  return res.status(400).json({ error: "name is required" });
}

Additional references & examples

Clean Code (summary concepts)
Readable structure complements backend layering.
Express.js guide
Routing, middleware order, and request/response lifecycle.