\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{digotetso}
\pdfinfo{
  /Title (nodejs-cheat-sheet.pdf)
  /Creator (Cheatography)
  /Author (digotetso)
  /Subject (Nodejs Cheat Sheet)
}

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\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
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\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
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\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{667292}
\definecolor{LightBackground}{HTML}{F5F6F8}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Nodejs Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{digotetso} via \textcolor{DarkBackground}{\uline{cheatography.com/58474/cs/15450/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}digotetso \\
  \uline{cheatography.com/digotetso} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 11th April, 2018.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{p{0.74655 cm} x{4.23045 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{{\bf{Module}}}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{Module} & module has exports property e.g `module.exports = fn() =\textgreater{}\{\}`                       `module.exports = \{hello, move\}` \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\seqsplit{Require} & returns module.exports \tn 
% Row Count 6 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{config} & Storing configuration settings: \{\{nl\}\} {\bf{default, dev \& prod}}\{\{nl\}\} \seqsplit{``config.get(confiProperty)`} \tn 
% Row Count 9 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Node wraps you code with function expression \&  invokes it, this function expression has these argument: `exports, module, \_\_dirname \& \_\_filename`.Now  you have access to these argument within your code. You can use these argument e.g `module.exports = hello()` to expose ur module}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.84149 cm} x{3.13551 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Express}}  \tn
% Row 0
\SetRowColor{LightBackground}
install & `npm i express` \{\{nl\}\} `app = require('express')` \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
web server & `app.get('/', (req, res) =\textgreater{} \{\{\{nl\}\} res.send('hello')\{\{nl\}\}\}) \{\{nl\}\} app.listen(3000)` \tn 
% Row Count 6 (+ 4)
% Row 2
\SetRowColor{LightBackground}
route params\{\{nobreak\}\} & `req.params` \tn 
% Row Count 8 (+ 2)
% Row 3
\SetRowColor{white}
query params\{\{nobreak\}\} & `req.query` \tn 
% Row Count 10 (+ 2)
% Row 4
\SetRowColor{LightBackground}
middlewares\{\{nobreak\}\} & `app.use(body-parser.json())\{\{nl\}\}`parse body of req into json:-\{\{nl\}\} `app.use(express.json())`\{\{nl\}\} serves static files:-\{\{nl\}\}`app.use(express.static(path\{\{nl\}\}.join(\_\_dirname,'public')))` \tn 
% Row Count 18 (+ 8)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{route handle is a middleware. \newline request-processing-pipeline: Req -}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Request processing pipeline}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/digotetso_1523458559_Screen Shot 2018-04-11 at 4.43.02 PM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{`express.json()` will pass request to route handler and route will terminate request by sending response.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.09494 cm} x{3.88206 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Built - in modules (mostly used)}}  \tn
% Row 0
\SetRowColor{LightBackground}
path & to handle paths\{\{nl\}\} `path = require('path') \{\{nl\}\} path.join(\_\_dirname, 'public')` \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
os & provide operating system info  `\{\{nl\}\}os = require('os')  \{\{nl\}\} os.freemem() \{\{nl\}\} os.uptime() \{\{nl\}\} os.userInfo()` \tn 
% Row Count 7 (+ 4)
% Row 2
\SetRowColor{LightBackground}
http & make Node to act as webserver\{\{nl\}\}`server = require('http') \{\{nl\}\} server.createServer(req, res)=\textgreater{}\{\})\{\{nl\}\} server.listen(3000)` \tn 
% Row Count 12 (+ 5)
% Row 3
\SetRowColor{white}
process & Node process info - global object\{\{nl\}\} `port = process.env.PORT || 3000` \tn 
% Row Count 15 (+ 3)
% Row 4
\SetRowColor{LightBackground}
events & to handle events \{\{nl\}\} ` EventEmitter = require('events) \{\{nl\}\}emitter = new EventEmitter() \{\{nl\}\}emitter.on(eventName, listener)`  \{\{nl\}\} `emitter.emit(eventName,{[}args..{]})` \tn 
% Row Count 21 (+ 6)
% Row 5
\SetRowColor{white}
file system & to handle file system \{\{nl\}\}`fs = require('fs') \{\{nl\}\} fs.readfile(path, callback)\{\{nl\}\} fs.copyFile(source.txt,dest.txt, callback)` \tn 
% Row Count 26 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{set environment vars: `export PORT = 3000`}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.09494 cm} x{3.88206 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{ewwee}}  \tn
% Row 0
\SetRowColor{LightBackground}
require & \seqsplit{rrnrnrnrnrnrnrnrnrnrnrnrn} \tn 
% Row Count 1 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{2.4885 cm} p{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{www}}  \tn
% Row 0
\SetRowColor{LightBackground}
w & w \tn 
% Row Count 1 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} x{4.4793 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Debugging}}  \tn
% Row 0
\SetRowColor{LightBackground}
 & `dbDebugger = \seqsplit{require('debug')('app:db')} \{\{nl\}\} startDebugger= \seqsplit{require('debug')('app:start')`} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
 & ` \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{\{\{fa-check-circle\}\}Two names are will create:- `app:db \& app:start`. You can replace `console.log` with `dbDebugger` or `startDebugger`.   \newline  \newline \{\{fa-check-circle\}\}Define console output:-\{\{nl\}\} `export DEBUG=app:start` \textasciicircum{}or\textasciicircum{}\{\{nl\}\} `export DEBUG=app:db` \textasciicircum{}or\textasciicircum{} \{\{nl\}\} `export DEBUG=app:start,app:db` \textasciicircum{}or\textasciicircum{}\{\{nl\}\}`export DEBUG=app:*`}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.29402 cm} x{3.68298 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{NPM}}  \tn
% Row 0
\SetRowColor{LightBackground}
`npm init` & Create package.json file \{\{nl\}\} alt: `npm init  -{}-yes` \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
`npm i ` & Install npm package\{\{nl\}\} alt: `npm i -{}-save-dev` \{\{nl\}\} `npm i -{}-save` \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
`npm list` & lookup dependencies \& version \{\{nl\}\} alt: `npm list -{}-depth=0` \tn 
% Row Count 8 (+ 3)
% Row 3
\SetRowColor{white}
`npm outdated` & check 4 outdated npm package \tn 
% Row Count 10 (+ 2)
% Row 4
\SetRowColor{LightBackground}
`npm update` & update npm package - only updates minor \& patches \tn 
% Row Count 12 (+ 2)
% Row 5
\SetRowColor{white}
`npm  un` & uninstall npm package \tn 
% Row Count 13 (+ 1)
% Row 6
\SetRowColor{LightBackground}
`npm login` & login in npm registry \tn 
% Row Count 15 (+ 2)
% Row 7
\SetRowColor{white}
`npm adduser` & create user on npm registry \tn 
% Row Count 17 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}