Jade Bird

Jade Bird


Logging Best Practices in Node.js Applications

In this post, we will cover the following topics:

  • What are the logs and what is their importance?
  • Best practices to log
  • Important parts of the log
  • Correct usage of log levels
  • Why Winston?

What are the logs and their importance?

Logs are the events that reflect the various aspect of your application, it is the easiest mode of troubleshooting and diagnosing your application, if written correctly by the team.

When you start a Node.js server and the database is not running or stopped abruptly due to some issue or the server port is already in use, if there are no logs you would never know why the server failed.

Many times, as a developer, you need to debug some issue, we happily use debugger and breakpoints to understand where and what broke.

What would you do when your application is running on production? Can you attach a debugger there and replay around the bug? Obviously no. Hence, this is where logging will help you.

You will achieve ideal logging setup only when, without using the debugger, you can find an issue by going through logs and you know what and where things went wrong.

Best practices

1) Three important parts of logs

The application logs are both for humans and for machines. Humans refer to logs for debugging the issue and machines use the logs to generate various dashboards and graphs and for data analysis to produce various conclusions on the customer usages.

Every log should contain the three most important parts:

  • Source of log

When we have a microservice architecture, this becomes really crucial to know the source of the log, the information like service name, zone, hostname, etc.

The detailed metadata about the source is mostly handled by the log shipper agent, which will push the logs from all the microservices to the centralized logging system. Filebeat by ELK stack is one of the best options to consider for log shipper.

  • Timestamp

The moment when an event occurred or log was generated is really important. Hence, make sure every log has the timestamp so that we can sort and filter.

  • Level and context

When going through the logs to find the error, if the log doesn’t provide enough information and if you have to refer back to the code to understand, it would be very frustrating. Hence while logging we should pass enough context.

E.g. a log without context would look like the following: The operation failed!

The better example with meaningful context would be: Failed to create user, as the user id already exist

2) What and how to log?

  • Log methods and inputs:

While debugging the issue if we get to know which function was called and what parameters were passed, it will really help.

import logger from '../logSetup';
getInstallment(month: number, count: number ): number {
    logger.debug(`>>>> Entering getInstallment(month = ${month}, count= ${count}");
// process

const installment: number = 3;
log.debug("<<<< Exiting getIntallment()");
return installment;


While going through the logs >>>> and <<<< will give a high-level insight of entry of function and exit of function. This is inspired by git merge conflict.

  • The log should not evaluate to throw an exception

In line #7, the userService.getUser() can return null and .getId() can throw an exception, hence please avoid these kinds of scenarios.

import logger from ‘…/logSetup’;

processLoan(…) {

logger.debug(“>>>> Entering processLoan()”);

// ... process

logger.debug(`Processing user loan with id ${userService.getUser().getId()}`);
// this might throw error, when getUser returns undefined

logger.debug("&lt;&lt;&lt;&lt; Exiting processLoan()");
return true;


You should use Aspect js to automate the function level logs.

  • The log should not produce a side effect

The log should be stateless and should not produce any side effect. For example, the following log in line #7 will create a new resource in the database.

import logger from ‘…/logSetup’;

createUser() {

logger.debug(“>>>> Entering createUser”);

// … process

logger.debug(“Saving user loan {}”, userInfoRepository.save(userInfo)) // don’t do this

return true;

  • Log errors with details

When there is an Error be descriptive, mention what was attempted and why it failed.

Log what failed and what you are doing next.

import logger from ‘…/logSetup’;

processLoan(id: number, userId: number) {

try {


} catch(error) {

log.error(Failed to do getLoanDetails with id ${id}, ignoring it and trying to getLoanDetailsByUserId, error);

// good example: provide what failed, and how you are handling.

// e.g here on fail I am trying to call other function





In case you are throwing back the error in catch section, please log which operation failed and mention that you are throwing the error as is.

import logger from ‘…/logSetup’;

processLoan(id: number, userId: number) {

try {


} catch(error) {

log.error(Failed to do getLoanDetails with id ${id} hence throwing error, error);

// good example: provide what failed, and how you are handling.

// e.g here on fail I am throwing

throw error;



3) Sensitive information

The series of logs should reflect the activities of a user in the application so that debugging can be easier and should log the errors so that the action can be taken as soon as possible. The logs contain pieces of information like which function was called with what inputs, where and what error occurred, etc.

While logging we have to make sure we do not log the sensitive information like username and password, financial information like the card number, CVV number, etc.

As developers, we should ask and consult with the product team to prepare a list of sensitive information and mask it before logging.

4) Correct usage of log levels

If production applications have a reasonably high number of user transactions, per day the ideal log setup might generate GBs of logs, hence we would need to categorize our logs in multiple groups. So that depending on the audience, we can switch the log level on run time, and get only appropriate logs.

For example, if a product manager wants to see how many customers transactions are successful or failed in our logging dashboard, he should not be shown cluttered information of function calls on various which is only for developers. And when there is a bug in production, the developer should see the detailed logs of the various functions that were successfully executed and which failed. So that the issue can be identified and fixed asap.

To achieve this kind of setup, we need to have a better understanding of each log levels.

Let’s discuss the most important levels and their usages:

  • INFO: Some important messages, event messages which describe when one task is finished. For example: New User created with id xxx This represents the just for information logs on progress.
  • · DEBUG: This level is for developers, this is similar to logging the information which you see while you are using debugger or breakpoint, like which function was called and what parameters were passed, etc. It should have the current state so that it can be helpful while debugging and finding the exact issue.
  • · WARN: These logs are the warnings and not blocking the application to continue, these provide alerts when something is wrong and the workaround is used. e.g wrong user input, retries, etc. The admins should fix these warnings in the future.
  • · ERROR: Something wrong happened and should be investigated on priority. E.g. database is down the communication with other microservice was unsuccessful or the required input was undefined.

The primary audiences are system operators or monitoring systems.

Ideally, the production app should have close to zero error logs.

5) Don’t use console.log

Most of the developers have used the console module as the first tool to get the logs or debug the code, as it’s easy to use, available globally and no setup is required. In Node.Js the console is implemented differently than in browsers, the console module prints the message in stdout when using console.log and if when you use console.error it will print to stderr.

The console.log, console.debug and console.info prints in stdout, hence we will not be able to switch off or on debug and info. Similarly, console.warn and console.error both prints in stderr.

The switching of various levels is hard on the production app.

We also need different kinds of configuration like standard format, JSON output format to send to ELK stack, and these are not available in console out of the box. 

To overcome all these issues we will use Winston logging framework, there are few other options are also available like Bunyan, Pino, etc.

Why we need a logging library like Winston?

As in the last section we discussed a few flaws of the console, let’s list down few important features provided by Winston:

  • Levels: Winston comes with few sets of log levels and also prints the level as the part of the log, which will enable us to filter the logs in our centralized dashboard.

e.g {message: “something wrong”, level: “error"}

You can also create custom levels if needed.

  • Formats: Winston has some advanced configurations, like giving colors to logs, formatting in JSON, etc.
  • Dynamically changing the log levels: We will have warning and error enabled in our production application, and when needed we need the functionality to change the log level to debug and back to error, as per need without restarting the application. The Winston logger comes with this feature out of the box.
// log setup

import winston from ‘winston’;

const transports = {

console: new winston.transports.Console({ level: ‘warn’ }),


const logger = winston.createLogger({

transports: [transports.console, transports.file]


logger.info(‘This will not be logged in console transport because warn is set!’);

transports.console.level = ‘info’; // changed the level

logger.info(‘This will be logged in now!’);

export default {logger, transport}

We can also expose an API to change the level dynamically, expose REST API and in handler execute the line #13 to change level.

  • Transport: For our production environment, we would like to have a centralized logging system where all our microservices push the logs, and we will have the dashboard, filtering and searching of logs. This is the standard ELK setup or equivalent.
import winston from ‘winston’;

const logger = winston.createLogger({

level: ‘info’,

format: winston.format.json(),

transports: [


new winston.transports.File({ filename: ‘stdout.log’ })



export default logger;


Winston comes with configuration to write our logs to file so that any log shipper agent can push the logs to the centralized system.

The discussion is out of the scope of this post though, we should discuss this in detail in a separate post.

6) Performance impact

If the application’s frequency of writing log is high it might impact the performance of the application directly.

Debug and info level contributes to more than 95% of logs, that’s why we should only enable the error and warning level, and change the level to debug when we want to figure out the issue and switch it back to the error.

The logs are a life savior when there is an issue on the app. If you currently don’t have logging practices, frame a logging practice and add the logs to be mandatory in the code review checklist.

Happy logging.

Originally published by Mahesh Haldar at https://blog.bitsrc.io

#node-js #javascript #web-development

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Buddha Community

Logging Best Practices in Node.js Applications

NBB: Ad-hoc CLJS Scripting on Node.js


Not babashka. Node.js babashka!?

Ad-hoc CLJS scripting on Node.js.


Experimental. Please report issues here.

Goals and features

Nbb's main goal is to make it easy to get started with ad hoc CLJS scripting on Node.js.

Additional goals and features are:

  • Fast startup without relying on a custom version of Node.js.
  • Small artifact (current size is around 1.2MB).
  • First class macros.
  • Support building small TUI apps using Reagent.
  • Complement babashka with libraries from the Node.js ecosystem.


Nbb requires Node.js v12 or newer.

How does this tool work?

CLJS code is evaluated through SCI, the same interpreter that powers babashka. Because SCI works with advanced compilation, the bundle size, especially when combined with other dependencies, is smaller than what you get with self-hosted CLJS. That makes startup faster. The trade-off is that execution is less performant and that only a subset of CLJS is available (e.g. no deftype, yet).


Install nbb from NPM:

$ npm install nbb -g

Omit -g for a local install.

Try out an expression:

$ nbb -e '(+ 1 2 3)'

And then install some other NPM libraries to use in the script. E.g.:

$ npm install csv-parse shelljs zx

Create a script which uses the NPM libraries:

(ns script
  (:require ["csv-parse/lib/sync$default" :as csv-parse]
            ["fs" :as fs]
            ["path" :as path]
            ["shelljs$default" :as sh]
            ["term-size$default" :as term-size]
            ["zx$default" :as zx]
            ["zx$fs" :as zxfs]
            [nbb.core :refer [*file*]]))

(prn (path/resolve "."))

(prn (term-size))

(println (count (str (fs/readFileSync *file*))))

(prn (sh/ls "."))

(prn (csv-parse "foo,bar"))

(prn (zxfs/existsSync *file*))

(zx/$ #js ["ls"])

Call the script:

$ nbb script.cljs
#js {:columns 216, :rows 47}
#js ["node_modules" "package-lock.json" "package.json" "script.cljs"]
#js [#js ["foo" "bar"]]
$ ls


Nbb has first class support for macros: you can define them right inside your .cljs file, like you are used to from JVM Clojure. Consider the plet macro to make working with promises more palatable:

(defmacro plet
  [bindings & body]
  (let [binding-pairs (reverse (partition 2 bindings))
        body (cons 'do body)]
    (reduce (fn [body [sym expr]]
              (let [expr (list '.resolve 'js/Promise expr)]
                (list '.then expr (list 'clojure.core/fn (vector sym)

Using this macro we can look async code more like sync code. Consider this puppeteer example:

(-> (.launch puppeteer)
      (.then (fn [browser]
               (-> (.newPage browser)
                   (.then (fn [page]
                            (-> (.goto page "https://clojure.org")
                                (.then #(.screenshot page #js{:path "screenshot.png"}))
                                (.catch #(js/console.log %))
                                (.then #(.close browser)))))))))

Using plet this becomes:

(plet [browser (.launch puppeteer)
       page (.newPage browser)
       _ (.goto page "https://clojure.org")
       _ (-> (.screenshot page #js{:path "screenshot.png"})
             (.catch #(js/console.log %)))]
      (.close browser))

See the puppeteer example for the full code.

Since v0.0.36, nbb includes promesa which is a library to deal with promises. The above plet macro is similar to promesa.core/let.

Startup time

$ time nbb -e '(+ 1 2 3)'
nbb -e '(+ 1 2 3)'   0.17s  user 0.02s system 109% cpu 0.168 total

The baseline startup time for a script is about 170ms seconds on my laptop. When invoked via npx this adds another 300ms or so, so for faster startup, either use a globally installed nbb or use $(npm bin)/nbb script.cljs to bypass npx.


NPM dependencies

Nbb does not depend on any NPM dependencies. All NPM libraries loaded by a script are resolved relative to that script. When using the Reagent module, React is resolved in the same way as any other NPM library.


To load .cljs files from local paths or dependencies, you can use the --classpath argument. The current dir is added to the classpath automatically. So if there is a file foo/bar.cljs relative to your current dir, then you can load it via (:require [foo.bar :as fb]). Note that nbb uses the same naming conventions for namespaces and directories as other Clojure tools: foo-bar in the namespace name becomes foo_bar in the directory name.

To load dependencies from the Clojure ecosystem, you can use the Clojure CLI or babashka to download them and produce a classpath:

$ classpath="$(clojure -A:nbb -Spath -Sdeps '{:aliases {:nbb {:replace-deps {com.github.seancorfield/honeysql {:git/tag "v2.0.0-rc5" :git/sha "01c3a55"}}}}}')"

and then feed it to the --classpath argument:

$ nbb --classpath "$classpath" -e "(require '[honey.sql :as sql]) (sql/format {:select :foo :from :bar :where [:= :baz 2]})"
["SELECT foo FROM bar WHERE baz = ?" 2]

Currently nbb only reads from directories, not jar files, so you are encouraged to use git libs. Support for .jar files will be added later.

Current file

The name of the file that is currently being executed is available via nbb.core/*file* or on the metadata of vars:

(ns foo
  (:require [nbb.core :refer [*file*]]))

(prn *file*) ;; "/private/tmp/foo.cljs"

(defn f [])
(prn (:file (meta #'f))) ;; "/private/tmp/foo.cljs"


Nbb includes reagent.core which will be lazily loaded when required. You can use this together with ink to create a TUI application:

$ npm install ink


(ns ink-demo
  (:require ["ink" :refer [render Text]]
            [reagent.core :as r]))

(defonce state (r/atom 0))

(doseq [n (range 1 11)]
  (js/setTimeout #(swap! state inc) (* n 500)))

(defn hello []
  [:> Text {:color "green"} "Hello, world! " @state])

(render (r/as-element [hello]))


Working with callbacks and promises can become tedious. Since nbb v0.0.36 the promesa.core namespace is included with the let and do! macros. An example:

(ns prom
  (:require [promesa.core :as p]))

(defn sleep [ms]
   (fn [resolve _]
     (js/setTimeout resolve ms))))

(defn do-stuff
   (println "Doing stuff which takes a while")
   (sleep 1000)

(p/let [a (do-stuff)
        b (inc a)
        c (do-stuff)
        d (+ b c)]
  (prn d))
$ nbb prom.cljs
Doing stuff which takes a while
Doing stuff which takes a while

Also see API docs.


Since nbb v0.0.75 applied-science/js-interop is available:

(ns example
  (:require [applied-science.js-interop :as j]))

(def o (j/lit {:a 1 :b 2 :c {:d 1}}))

(prn (j/select-keys o [:a :b])) ;; #js {:a 1, :b 2}
(prn (j/get-in o [:c :d])) ;; 1

Most of this library is supported in nbb, except the following:

  • destructuring using :syms
  • property access using .-x notation. In nbb, you must use keywords.

See the example of what is currently supported.


See the examples directory for small examples.

Also check out these projects built with nbb:


See API documentation.

Migrating to shadow-cljs

See this gist on how to convert an nbb script or project to shadow-cljs.



  • babashka >= 0.4.0
  • Clojure CLI >=
  • Node.js 16.5.0 (lower version may work, but this is the one I used to build)

To build:

  • Clone and cd into this repo
  • bb release

Run bb tasks for more project-related tasks.

Download Details:
Author: borkdude
Download Link: Download The Source Code
Official Website: https://github.com/borkdude/nbb 
License: EPL-1.0

#node #javascript

bindu singh

bindu singh


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The age limit is 18 to 25 years. It may differ from one airline to another!


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  • The candidate should not have a significant cardiovascular condition.

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Aria Barnes

Aria Barnes


Why use Node.js for Web Development? Benefits and Examples of Apps

Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.

What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

  • quick execution and information preparing; 
  • exceptionally reusable code; 
  • the code is not difficult to learn, compose, read, and keep up; 
  • tremendous asset library, a huge number of free aides, and a functioning local area. 

In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

Designers Can Utilize JavaScript for the Whole Undertaking 

This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based. 

A Quick Environment for Microservice Development 

There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.

Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.


Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

Original Source

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