chroma-log/index.js

A Colourful and minimal HTTP request logging middleware for node.js

const chalk = require('chalk');

const getDurationInMilliseconds = (start) => {
  const NS_PER_SEC = 1e9;
  const NS_TO_MS = 1e6;
  const diff = process.hrtime(start);

  return (diff[0] * NS_PER_SEC + diff[1]) / NS_TO_MS;
};

function logPose(req, res, next) {
  const start = process.hrtime();

  function GetColour(code) {
    if (code >= 200 && code < 300) {
      return chalk.greenBright.underline(code);
    }
    if (code >= 300 && code < 400) {
      return chalk.blueBright.underline(code);
    }
    if (code >= 400 && code < 500) {
      return chalk.yellowBright.underline(code);
    }
    if (code >= 500) {
      return chalk.redBright.underline(code);
    }
  }

  const { url } = req;

  res.on('finish', () => {
    const responseCode = res.statusCode;
    GetColour(responseCode);
    // eslint-disable-next-line no-console
    console.log(`${chalk.magentaBright(req.method)}: ${chalk.whiteBright('')}${GetColour(responseCode)}${chalk.whiteBright('')} ${chalk.cyanBright('->')}${chalk.redBright(' [ ')}${chalk.underline.whiteBright(url)}${chalk.redBright(' ]')} ${chalk.cyanBright('-> ')}${getDurationInMilliseconds(start).toLocaleString()}ms${chalk.cyanBright('')}`);
  });

  next();
}

module.exports = logPose;