Read a file in Node js

Question

I m quite puzzled with reading files in Node js    fs open    start html    r   function err  fileToRead       if   err           fs readFile fileToRead   encoding   utf-8    function err data               if   err               console log  received data      data               response writeHead 200    Content-Type    text html                 response write data               response end                 else                  console log err                                  else          console log err               File start html is in the same directory with file that tries to open and read it   However  in the console I get         Error  ENOENT  open    start html   errno  34  code   ENOENT   path     start html      Any ideas

User · Answer

To read the html file from server using http module. This is one way to read file from server. If you want to get it on console just remove http module declaration.

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var http = require('http');_x000D_
var fs = require('fs');_x000D_
var server = http.createServer(function(req, res) {_x000D_
  fs.readFile('HTMLPage1.html', function(err, data) {_x000D_
    if (!err) {_x000D_
      res.writeHead(200, {_x000D_
        'Content-Type': 'text/html'_x000D_
      });_x000D_
      res.write(data);_x000D_
      res.end();_x000D_
    } else {_x000D_
      console.log('error');_x000D_
    }_x000D_
  });_x000D_
});_x000D_
server.listen(8000, function(req, res) {_x000D_
  console.log('server listening to localhost 8000');_x000D_
});

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<html>_x000D_
_x000D_
<body>_x000D_
  <h1>My Header</h1>_x000D_
  <p>My paragraph.</p>_x000D_
</body>_x000D_
_x000D_
</html>

_x000D_

User · Answer

var fs   require  fs    var path   require  path     exports testDir   path dirname   filename   exports fixturesDir   path join exports testDir   fixtures    exports libDir   path join exports testDir      lib    exports tmpDir   path join exports testDir   tmp    exports PORT    process env NODE COMMON PORT    12346      Read File fs readFile exports tmpDir   start html    utf-8   function err  content      if  err        got error   true      else       console log  cat returned some content      content       console log  this shouldn  t happen as the file doesn  t exist             assert equal true  false

User · Answer

With Node 0 12  it s possible to do this synchronously now     var fs   require  fs      var path   require  path          Buffer mydata   var BUFFER   bufferFile     public mydata png       function bufferFile relPath        return fs readFileSync path join   dirname  relPath       zzzz           fs is the file system   readFileSync   returns a Buffer  or string if you ask   fs correctly assumes relative paths are a security issue   path is a work-around   To load as a string  specify the encoding   return fs readFileSync path   encoding   utf8

User · Answer

Use path join   dirname    start html    var fs   require  fs        path   require  path            filePath   path join   dirname   start html     fs readFile filePath   encoding   utf-8    function err data       if   err            console log  received data      data           response writeHead 200    Content-Type    text html             response write data           response end          else           console log err

User · Answer

Run this code  it will fetch data from file and display in console  function fileread filename                   var contents  fs readFileSync filename      return contents            var fs  require  fs        file system         var data  fileread  abc txt      module exports say  say    data say    console log data toString

User · Answer

1  For ASync    var fs   require  fs    fs readFile process cwd      text txt   function err data                                if err                      console log err                  else                     console log data toString                       2  For Sync    var fs   require  fs    var path   process cwd    var buffer   fs readFileSync path      text txt    console log buffer toString

User · Answer

simple synchronous way with node   let fs   require  fs    let filename    your-file something   let content   fs readFileSync process cwd           filename  toString    console log content

User · Answer

Use path join   dirname    start html      var fs   require  fs        path   require  path            filePath   path join   dirname   start html     fs readFile filePath   encoding   utf-8    function err data       if   err            console log  received data      data           response writeHead 200    Content-Type    text html             response write data           response end          else           console log err               Thanks to dc5

User · Answer

If you want to know how to read a file  within a directory  and do something with it  here you go  This also shows you how to run a command through the power shell  This is in TypeScript  I had trouble with this  so I hope this helps someone one day  Feel free to down vote me if you think its THAT unhelpful  What this did for me was webpack all of my  ts files in each of my directories within a certain folder to get ready for deployment  Hope you can put it to use   import   as fs from  fs   let path   require  path    let pathDir     path to myFolder   const execSync   require  child process   execSync   let readInsideSrc    error  any  files  any  fromPath  any    gt        if  error            console error  Could not list the directory    error           process exit 1              files forEach  file  any  index  any    gt            if  file endsWith   ts                    set the path and read the webpack config js file as text  replace path             let config   fs readFileSync  myFile js    utf8                let fileName   file replace   ts                    let replacedConfig   config replace    placeholder g  fileName                  write the changes to the file             fs writeFileSync  myFile js   replacedConfig                  run the commands wanted             const output   execSync  npm run scriptName     encoding   utf-8                  console log  OUTPUT  n   output                  rewrite the original file back             fs writeFileSync  myFile js   config                            loop through all files in  path  let passToTest    error  any  files  any    gt        if  error            console error  Could not list the directory    error           process exit 1              files forEach function  file  any  index  any            let fromPath   path join pathDir  file           fs stat fromPath  function  error2  any  stat  any                if  error2                    console error  Error stating file    error2                   return                             if  stat isDirectory                      fs readdir fromPath   error3  any  files1  any    gt                        readInsideSrc error3  files1  fromPath                                     else if  stat isFile                        do nothing yet                                          run the bootstrap fs readdir pathDir  passToTest

[node.js] Read a file in Node.js

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