LogMyErr

LogMyErr JS Module enables write logs in log file or text file in server side.

Features:

• Uses the custom log message to output information and write log to the text file of log file/ in custom extention.
• Exception Handler allows us to handle exception from the route file in MVC.

Please report bugs there on Github.

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Implementing Logger and Custom Logger

    const {logger} = require('logmyerr');
    logger.write("Hello, World");

• logger will creates a log directory in your local folder and create it automatically create a folder log with logmyerr-dd-mm-yy.log format in base project directory

• logger.write this methods takes different parameters.

  • message - required parameter, This takes your message or a information. type : String, default value : No
  • type - optional parameter, it can accept only the Info/error/warn/debug. type : String, default value : info
    • Example
      1. logger.LOGTYPE.info
      2. logger.LOGTYPE.error
      3. logger.LOGTYPE.warn
      4. logger.LOGTYPE.debug

   loggers.write(err.stack,loggers.LOGTYPE.info);

  • priority - optional parameter, it can accept only the critical/informative/major. type : String, default value : informative
    • Example
      1. this.PRIORITY.critical
      2. this.PRIORITY.informative
      3. this.PRIORITY.major

   loggers.write(err.stack,loggers.LOGTYPE.info, loggers.PRIORITY.informative);

OR

    const {customLogger} = require('logmyerr');
    const logger = customLogger.getInstance();
    logger.write("Hello, World");

• In this customLogger it help us to change the default configuration.

Example

    const {customLogger} = require('logmyerr');
    let defaultConfig = {
        logFileName: "logmyerr" ,
        logFileExtension: ".log",
        logFilePath: "<Your System local path or a Custom Path>", 
        logFolderName: "logs",
        }
    const logger = customLogger.getInstance(defaultConfig);
    logger.write("Hello, World");

• logger will creates a logs directory in custom local folder and create it automatically create a folder log with logmyerr-dd-mm-yy.log format in base project directory

• logger.write this methods takes different parameters.

  • message - required parameter, This takes your message or a information. type : String, default value : No
  • type - optional parameter, it can accept only the Info/error/warn/debug. type : String, default value : info
    • Example
      1. logger.LOGTYPE.info
      2. logger.LOGTYPE.error
      3. logger.LOGTYPE.warn
      4. logger.LOGTYPE.debug

   loggers.write(err.stack,loggers.LOGTYPE.info);

  • priority - optional parameter, it can accept only the critical/informative/major. type : String, default value : informative - Example 1) this.PRIORITY.critical 2) this.PRIORITY.informative 3) this.PRIORITY.major

   loggers.write(err.stack,loggers.LOGTYPE.info, loggers.PRIORITY.informative);

Exception Handler Router based

If you are following MVC patter in you Application you can use this exception handler to Handle all your exception from your router. Basically It will handles the all the exception from your controller.

let  express  =  require('express');
let  router  =  express.Router();
let {exceptionHandler} =  require('logmyerr');
const  LoginController  =  require('../controllers/login.controllers');
router.post('/', exceptionHandler(LoginController.login)); 

and also it must to be implement the global exception handler in main.js file

Example

📁 app.js

var  createError  =  require('http-errors');
var  express  =  require('express');
var  path  =  require('path');
var  cookieParser  =  require('cookie-parser');
// importing DotEnv
require('dotenv').config();
let {logger} =  require('logmyerr');
let  loginRouter  =  require('./routes/login.routes');

var  app  =  express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/login', loginRouter);

app.use(function(req, res, next) {
if(process.env.NODE_ENV ===  'development'){
next(createError(404));
}else  if(process.env.NODE_ENV ===  'Perf'){
next(createError(404));
}else{
const  err  =  new  Error('Not Found');
err.status =  404;
next(err);
}
});

// error handler
app.use(function(err, req, res, next) {
if(process.env.NODE_ENV ===  'development'){
// set locals, only providing error in development
res.locals.message =  err.message;
res.locals.error =  req.app.get('env') ===  'development'  ?  err  : {};
loggers.write(err.stack,loggers.LOGTYPE.error, loggers.PRIORITY.critical);
// render the error page
res.status(err.status ||  500);
res.json({
message: err.message,
});
}
else{
res.status (err.status ||  500);
loggers.write(err.stack,loggers.LOGTYPE.error, loggers.PRIORITY.critical);
res.json({
error: {
message: "Internal Server Error"
}
});
}
});
module.exports  =  app;

📶 router.js

let  express  =  require('express');
let  router  =  express.Router();
let {exceptionHandler} =  require('logmyerr');
const  LoginController  =  require('../controllers/login.controllers');
router.post('/', exceptionHandler(LoginController.login));

🎮 Controller.js

const  LoginController  = {}
LoginController.login  = (req, res) => {
	throw  new  Error("Dummy Exception");
}

License

MIT