Koa request logger

Simple middleware for Koa 2 to log in and out request, with diff time, and custom logger.

Install

npm install --save koa-request-logger

Usage

const Koa = require('Koa');
const koaRequestLogger = require('koa-request-logger');

const app = new Koa();
app.use(koaRequestLogger());

app.listen(3000);

Options

You can customize :

• logger, the logger object, by default console
• method, the logger method, by default log
• format, the output format function for IN and OUT request which takes params:
  • ctx: the koa context of the request
  • id: an unique ID to match in/out with easy
  • isIn: true if IN request, else false,
  • timeDiff: diff time for OUT requests (null for IN requests)

Example with winston as logger and custom log format

const Koa = require('Koa');
const koaRequestLogger = require('koa-request-logger');
const winston = require('winston');

const logger = new (winston.Logger)({
  transports: [
    new (winston.transports.Console)(),
    new (winston.transports.File)({ filename: 'somefile.log' })
  ]
});

const app = new Koa();
app.use(koaRequestLogger({
  logger,
  method: 'info',
  format: (ctx, id, isIn = true, timeDiff = null) => (isIn ?
    `Incoming request #${id}: method ${ctx.request.method}, url ${ctx.request.url}` :
    `Sending request results #${id}: method ${ctx.request.method}, url ${ctx.request.url}, status: ${ctx.status}, duration: ${timeDiff}ms`);
}));

app.listen(3000);

License

MIT