🎓 This repository contains examples that I have done for my own preparation for the Node.js certification exam - Application Developer (JSNAD).
This content is not official from the OpenJS Foundation or from Node.js.
I have been working in this repository for several months. I have wanted to share OpenSource examples that I have developed for my own preparation. These examples are organized by folders for each Node.js API.
Usage & Example
Assertion Testing
Buffer
Child Processes
Cluster
Console
ECMAScript Modules
Errors
Events
File System
HTTP
HTTP/2
HTTPS
Inspector
Internationalization
Modules
Net
OS
Path
Performance Hooks
Process
Query Strings
Readline
REPL
Report
Stream
Timers
Utilities
V8
VM
Worker Threads
Zlib
Go through the core Node.js API, focus on streams, buffers, the event system and child processes. As described in the exam details they are the most important topics.
- Buffer and Streams – 11% (++)
- Node.js Buffer API’s
- Incremental Processing
- Transforming Data
- Connecting Streams
- Control flow – 12%
- Managing asynchronous operations
- Control flow abstractions
- Child Processes – 8% (++)
- Spawning or Executing child processes
- Child process configuration
- Diagnostics – 6%
- Debugging Node.js
- Basic performance analysis
- Error Handling – 8%
- Common patterns
- Handling errors in various scenarios
- Node.js CLI – 4%
- Node executable command line flags https://nodejs.org/dist/latest-v14.x/docs/api/cli.html
- Events – 11% (++)
- The event system
- Building event emitters
- Consuming event emitters
- File System – 8%
- Input/output
- Watching
- JavaScript Prerequisites – 7%
- Language fundamentals
- Scoped to core language features introduced since EcmaScript 1 and still heavily used today
- Module system – 7%
- CommonJS Module System only
- Process/Operating System – 6%
- Controlling the process
- Getting system data
- Package.json – 6%
- Package configuration
- Dependency management
- Unit Testing – 6%
- Using assertions
- Testing synchronous code
- Testing asynchronous code
-
Generic
-
Child Processes
-
Console
-
ECMAScript Modules
-
Events
-
File System
-
Worker Threads
-
Control Flow
-
Performance Hooks
-
Stream
- Backpressuring in Streams
- Understanding Streams in Node.js
- Node.js Streams Tutorial - An Introduction to Node.js Streams
- Node.js Stream Tutorial - The Power and Simplicity of Node.js Streams
- El manejo de streams en NodeJS
- Node.js Streams: Everything you need to know
- Using Node.js to Read Really, Really Large Datasets & Files
- Streams For the Win: A Performance Comparison of Node.js Methods for Reading Large Datasets (Pt 2)
ESTlint, tool for identifying and reporting on patterns found in ECMAScript/JavaScript code.
NPM ESLint
NPM ESLint | Airbnb
In order to work with this project, your local environment must have at least the following versions:
- NodeJS Version: 14.xx
- NPM Version: 6.14.7
$npm i$node ./src/'folder'/'file.js'# If you want use http2 you need generate localhost certificate
$openssl req -x509 -newkey rsa:2048 -nodes -sha256 -subj '/CN=localhost' -keyout localhost-privkey.pem -out localhost-cert.pem/
├── assets 🌈 # Images Sources.
| └── ... # ...
| |
├── env 🔌 # Configure enviroments deploy.
| └── ... # ...
| |
├── src 💯
| ├── usage-example # Usage & Example.
| | ├── example01 # Http server return pain text.
| | └── example02 # Http server return json object.
| |
| ├── assertion-testing # Assertion Testing.
| | ├── example01 # Equal numbers or not with assert.strictEqual method.
| | ├── example02 # Equal numbers and string or not with assert.equal method.
| | ├── example03 # Equal arrays values and structure or not with strict.deepEqual method.
| | ├── example04 # Equal objects values and structure or not with strict.deepEqual method.
| | └── example05 # Http request with Reject results and objects results with structure and typeof control.
| |
| ├── async-hooks # Async Hooks.
| | ├── example01 # Create http server with external request to get content. This functions launch async hooks and save into .log file.
| | ├── test.log # Log example file.
| | └── ... # ...
| |
| ├── buffer # Buffer.
| | ├── example01 # Create first safe and not Buffer empty and with string.
| | ├── example02 # Get length of string and buffer string.
| | ├── example03 # Is Buffer and is Encoding functions.
| | ├── example04 # Work with compare, concat, equal, includes, indexOf, lastIndeOf, keys and slice functions.
| | ├── example05 # Work with toString and toJSON functions.
| | └── ... # ...
| |
| ├── child-processes # Child Processes.
| | ├── example01 # spawn function.
| | ├── example02 # exec and execSync functions.
| | ├── example03 # spawn and spawnSync functions.
| | ├── example04 # exec and spawn functions with custom sh file.
| | ├── example05 # exec and spawn functions with magick tool (you need install imagemagick library).
| | ├── example06 # execFile and execFileSync functions.
| | ├── example07 # fork function with example messages to childs.
| | ├── example07-sub01 # sub process message fork function.
| | ├── example07-sub01 # sub process message fork function.
| | ├── example08 # fork function with process ls and sh.
| | ├── example08-sub01 # sub process spawnSync ls fork function.
| | ├── example08-sub01 # sub process spawnSync sh fork function.
| | ├── test.sh # Sh example file.
| | ├── cat.jpg # Image cat example.
| | └── ... # ...
| |
| ├── cluster # Cluster.
| | ├── example01 # Show CPUs number and create a cluster for each core.
| | ├── example02 # Control cluster waiting or working any task.
| | └── ... # ...
| |
| ├── console # Console.
| | ├── example01 # Basic console log, error and warn.
| | ├── example02 # Console log with params added.
| | ├── example03 # Show and get log and save into .log files (out and error files).
| | ├── example04 # Clear console with setTimeout into async function.
| | ├── example05 # Assert, count, countReset.
| | ├── example06 # Group and groupEnd.
| | ├── example07 # Time and timeEnd.
| | ├── example08 # Table with arrays of numbers, objects and more arrays of strings.
| | └── ... # ...
| |
| ├── esm # ECMAScript Modules.
| | ├── example01 # Import esm module with .js extension file.
| | ├── example02 # Import esm module from "libs" folder into your js application with .js extension file.
| | ├── example03 # Import esm submodule from "libs" folder into your js application with .js extension file.
| | └── ... # ...
| |
| ├── errors # Errors.
| | ├── example01 # Variable no defined into try/catch.
| | ├── example02 # With properties of an object in try/catch.
| | ├── example03 # In callback functions.
| | ├── example04 # In try/catch with async and sync functions.
| | ├── example05 # Custom message Error into throw.
| | └── ... # ...
| |
| ├── events # Events.
| | ├── example01 # Differents instances and times.
| | ├── example02 # Define arguments and show.
| | ├── example03 # Extends class EventEmitter and create main scope with custom properties.
| | ├── example04 # What happens to the functions: setTimeout, setImmediate and process.nextTick.
| | ├── example05 # Handling events only once.
| | ├── example06 # Remove event with removeListener.
| | ├── example07 # Set Max Listeners to event with setMaxListeners.
| | └── ... # ...
| |
| ├── file-system # File System.
| | ├── example01 # Open and close file by name with concrete path.
| | ├── example02 # Open and close with Url and Buffer.
| | ├── example03 # Get File Descriptors with stat function from json and txt files.
| | ├── example04 # Open folder and file details with opendirSync and openSync functions.
| | ├── example05 # Read folder and file content with readdirSync and readFileSync functions.
| | ├── example06 # Get folder content with Callback, Sync and Promises.
| | ├── example07 # Get file list of folder and content files with Sync.
| | ├── example08 # Get if directory is or not directory and file is or not file.
| | ├── example09 # Access function for get if file exist or not.
| | ├── example10 # Append function for include new data inside file.
| | ├── example11 # Chmod function for set and change permissions of a file.
| | ├── example12 # Chown function for set and change owner and group of a file.
| | ├── example13 # Copy function for copy file from origin to destination.
| | ├── example14 # Create Read Stream from file for get all content and others.
| | ├── example15 # Create file and Write Stream of new file for save all content.
| | ├── example16 # Create symbolic link with link function.
| | ├── example17 # Create directories with mkdir, mkdirSync.
| | ├── example18 # Create temp directories with mkdtemp and mkdtempSync.
| | ├── example19 # Rename file with rename and renameSync functions.
| | ├── example20 # Remove folders with rmdir and rmdirSync functions with recursive option.
| | ├── example21 # Remove files with unlink and unlinkSync functions.
| | ├── example22 # Create listener for get if change the folder and files content.
| | └── ... # ...
| |
| ├── http # HTTP.
| | ├── example01 # Get methods and status codes from http.
| | ├── example02 # Create http server and show lifecycle-events.
| | ├── example03 # Create http server with custom routers and reponses for POST or GET methods.
| | ├── example04 # Request to url with method GET and port 80 and received JSON object.
| | ├── example05 # Request to url with method POST and port 80 send and received JSON object.
| | └── ... # ...
| |
| ├── http2 # HTTP2.
| | ├── example01 # Create http2 server and response html elements.
| | ├── example02 # Create http2 server and show lifecycle-events.
| | ├── example03 # Create http and http2 server and see all differences.
| | | ├── example03-http # Create http server and return static file. See that the connection open and close for each request.
| | | └── example03-https # Create http2 server and return static file. See that the connection open one time and not close for each request.
| | ├── example04 # Create http2 server and with html file and push css and js file.
| | └── ... # ...
| |
| ├── https # HTTPS.
| | ├── example01 # Create https server and response html elements.
| | ├── example02 # Request to url with method GET and port 443 and received JSON object.
| | └── ... # ...
| |
| ├── inspector # Inspector.
| | ├── example01 # Create inspector instance and config host and port.
| | ├── example02 # Send console log, warn, info and error.
| | ├── example03 # Send console table.
| | ├── example04 # Create new session for any inspector and report via console.
| | ├── example05 # Create new session for any inspector and write profile.cpuprofile file.
| | └── ... # ...
| |
| ├── intl # Internationalization.
| | ├── example01 # toLowerCase and toUpperCase functions with String.
| | ├── example02 # Collator functions for get order string and sort string by order.
| | ├── example03 # DateTimeFormat for get date with differents languaje and formats.
| | ├── example04 # NumberFormat for format numbers with differents languaje and formats.
| | └── ... # ...
| |
| ├── modules # Modules.
| | ├── example01 # Module Exports and Require consts with strings values.
| | ├── example02 # Module Exports and Require function for sum two digits.
| | ├── example03 # Module Exports and Require class with methods.
| | ├── example04 # Module Exports and Require classes extends with methods.
| | ├── example05 # Module Exports and Require classes extends with static method.
| | ├── example06 # Export Default and Import class extends with static method.
| | ├── example07 # Export and Import classes extends with static method.
| | ├── example08 # Two Require of the same Module assign with Require Cache just once.
| | ├── example09 # Require JS Module and JSON File.
| | ├── example10 # Require JS Module from folder with Package.json file.
| | └── ... # ...
| |
| ├── net # Net.
| | ├── example01 # Server and Client with emit messages and Close Socket Connection.
| | ├── example02 # Server and Client with severals messages from client Without Close Socket.
| | ├── example03 # Server and Two Clients send severals messages to all clientes Without Close Socket.
| | ├── example04 # Server and two clients and send Message to differents client Pear to Pear.
| | └── ... # ...
| |
| ├── os # OS.
| | ├── example01 # Get and show CPUs numbers and props.
| | ├── example02 # Get and show Free and Total System Memmory.
| | ├── example03 # Get and show Home Directory.
| | ├── example04 # Get and show Host Name Machine.
| | ├── example05 # Get and show Network Interfaces and props.
| | ├── example06 # Get and show Platform and Release.
| | ├── example07 # Get and show Temporal Directory.
| | ├── example08 # Get and show User Info.
| | ├── example09 # Get and show Operating System Constants.
| | └── ... # ...
| |
| ├── path # Path.
| | ├── example01 # Get Basename of current or specific folder.
| | ├── example02 # Use basename for get all internal files from folder and get basename of files.
| | ├── example03 # Use dirname for get the main folder and all internal files.
| | ├── example04 # Use extname for get extension of file name or all path.
| | ├── example05 # Get if any path is absolute.
| | ├── example06 # Use joins method for concat all string for create a correct path.
| | ├── example07 # Use normalize method for create corrects paths.
| | ├── example08 # Use parse method for get object with all properties of paths.
| | ├── example09 # Use relative method for compare two path and get an absolute path.
| | ├── example10 # Use sep method for generate array with split and resolve a structure with folders and files.
| | └── ... # ...
| |
| ├── perf-hooks # Performance Hooks.
| | ├── example01 # Timer and measure for JSON parse and stringify functions examples.
| | ├── example02 # Timer and measure for Get all files from specific folders in a function with callback.
| | ├── example03 # Timer and timerify wrapper for Get all files from specific folder with function with callback.
| | ├── example04 # Timers with severals externals request https for others REST APIs.
| | ├── example05 # Show Measure and Mark timers with two Observers
| | ├── example06 # Get duration timer of severals require functions of modules.
| | └── ... # ...
| |
| ├── process # Process.
| | ├── example01 # Use beforeExit event for get when event loop has no additional work to schedule.
| | ├── example02 # Send message between procces, one http server and other write into file.
| | ├── example03 # Use multipleResolves event for tracking potential errors in an application while using the Promise constructor.
| | ├── example04 # Use multipleResolves event with Promise.race() method returns a promise that fulfills or rejects as soon as one of the promises.
| | ├── example05 # Use unhandledRejection event for get all promise without catch.
| | ├── example06 # Use uncaughtException event for get all error of function without try/catch control.
| | ├── example07 # Use warning event for example to get exceeded listener of Event Emitter.
| | ├── example08 # The argv property contain all arguments include via CLI.
| | ├── example09 # The process.cwd() method returns the current working directory of the Node.js process.
| | ├── example10 # The process.emitWarning() method can be used to emit custom or application specific process warnings.
| | ├── example11 # The process.execArgv property returns the set of Node.js-specific command-line options passed when the Node.js process was launched.
| | ├── example12 # The process.exit() method instructs Node.js to terminate the process synchronously with an exit status of code.
| | ├── example13 # Use getegid, geteuid, getgid, getgroups and getuid functions for show info process identity.
| | ├── example14 # The bigint version of the process.hrtime() method returning the current high-resolution real time in nanoseconds.
| | ├── example15 # The process.memoryUsage() method returns an object describing the memory usage of the Node.js process measured in bytes.
| | ├── example16 # process.nextTick() adds callback to the "next tick queue".
| | ├── example17 # pid, platform, ppid, release props for get additional data of process and NodeJS release.
| | ├── example18 # Returns object the resource usage for the current process.
| | └── ... # ...
| |
| ├── querystring # Query String.
| | ├── example01 # Use querystring.encode for encode json object to url params.
| | ├── example02 # Use querystring.decode for decode url with several params to json object.
| | └── ... # ...
| |
| ├── readline # Readline.
| | ├── example01 # Use createInterface and create question and show user answer.
| | ├── example02 # To exit this process you just have to press <ctrl> + C.
| | ├── example03 # Get content for show from txt file for create interface.
| | ├── example04 # Use "process.stdin" events to get more interactions.
| | ├── example05 # Use line, close, pause and resume of readline for get events.
| | ├── example06 # Use keypress, keyup and keydown for get "process.stdin" events.
| | └── ... # ...
| |
| ├── repl # REPL.
| | ├── example01 # Create REPL and press .help for show all help commands.
| | ├── example02 # Create and press 2 times ^C again or ^D or type .exit.
| | ├── example03 # Run REPL, create a function and execute it..
| | ├── example04 # Create "replServer" and use defineCommand for include Specific Commands.
| | └── ... # ...
| |
| ├── report # Diagnostic Report.
| | ├── example01 # Write error and report to generic json file with an example.
| | ├── example02 # Write error and report to concrete file with an example.
| | ├── example03 # Launch an error and getReport to show javascriptStack object..
| | ├── example04 # Show errors and reports via EventEmitter.
| | └── ... # ...
| |
| ├── stream # Stream.
| | ├── example01 # Write severals string into file.txt with .write function.
| | ├── example02 # Include callbacks for open, ready, finish, open and error events.
| | ├── example03 # Write big file with .write method with this result: 1,1G stream-big-example03.txt.
| | ├── example04 # Show how many seconds the function fs.writeFile and fs.createWriteStream needs to perform the same task.
| | ├── example05 # Create origin and destination Stream and use gzip for compress file destination.
| | ├── example06 # Create origin Stream, Custom transform Stream and destination Stream for replace text from origin to destination file.
| | ├── example07 # Http server and Read Stream for create gz file from txt file and download with browser.
| | ├── example08 # Http server and Read Stream for return html file with gzip encoding.
| | ├── example09 # Readable with iterate function with yield.
| | ├── example10 # Readable with iterate array.
| | ├── example11 # Readable Stream with iterate map with severals objects items.
| | ├── example12 # Readable Object with iterate map and two pipes for work with severals Streams Writables.
| | ├── example13 # Parallel Pipes with Readable from array with iterate map, transform and Write with two Stream file.
| | ├── example14 # Sequentials Pipes with end option to false and Readable and Duplex with write functions more info with timeouts.
| | ├── example15 # Sequentials Pipes and Readable with autoClose option to false and Duplex with end option to false and set severals writes functions.
| | ├── example16 # Work with Readline and Write Stream to save line by line.
| | ├── example17 # Create Stream from origin file, replace all emails to * characters and save into new Stream file.
| | └── ... # ...
| |
| ├── timers # Timers.
| | ├── example01 # timeout vs immediate.
| | ├── example02 # timeout vs immediate with inside timers.
| | ├── example03 # timeout vs severals immediate.
| | ├── example04 # timeout vs immediate vs nextTick.
| | ├── example05 # nextTick with try/catch and not block timeout and immediate.
| | ├── example06 # timeout, immediate, nextTick and promises inside this with try/catch/finally.
| | ├── example07 # timeout, immediate, nextTick and promises inside this with then/catch/finally.
| | └── ... # ...
| |
| ├── util # Util.
| | ├── example01 # Use .callbackify method with async function.
| | ├── example02 # Use .callbackify method with Promise.
| | ├── example03 # Return with .debuglog method param.
| | ├── example04 # Return with .debuglog method severals params.
| | ├── example05 # Return console with color in terminal and params.
| | └── ... # ...
| |
| ├── worker-threads # Worker Threads.
| | ├── example01 # Create Worker with the same file..
| | ├── example02 # Create Worker with differents files for create two parallels tasks.
| | ├── example03 # Create two Worker and send messages with parent.
| | ├── example04 # Create ten Worker and send messages to parent with finish setTimeout with random time.
| | ├── example05 # Create Worker when update the content of local json file for change it and save into other file.
| | └── ... # ...
| |
| ├── zlib # Zlib.
| | ├── example01 # Compress to zip destination file from txt file how source.
| | ├── example02 # Compress jpg file to zip file and decompress zip for get jpg origin file.
| | ├── example03 # Create .gz file from jpg file and uncompress with createGunzip method.
| | ├── example04 # Create severals .gz file with gzip, deflate and brotli methods. You can see which one is more efficient.
| | ├── example05 # Create http server and return html file with Brotli Compress via response Stream.
| | ├── example06 # Create http server and Static files into a public folder.
| | └── ... # ...
| |
| └── ...
└── ...
For review and update all npm dependences of this project you need install in global npm package "npm-check-updates" npm module.
# Install and Run
$npm i -g npm-check-updates
$ncuCreated with JavaScript, lot of ❤️ and a few ☕️