node js - how to write an array to file

Question

I have a sample array as follows  var arr       1373628934214  3        1373628934218  3        1373628934220  1        1373628934230  1        1373628934234  0        1373628934237  -1        1373628934242  0        1373628934246  -1        1373628934251  0        1373628934266  11       I would like to write this array to a file such as I get a file as follows  1373628934214  3  1373628934218  3 1373628934220  1

User · Accepted Answer

If it s a huuge array and it would take too much memory to serialize it to a string before writing  you can use streams   var fs   require  fs     var file   fs createWriteStream  array txt    file on  error   function err       error handling        arr forEach function v    file write v join           n        file end

User · Answer

We can simply write the array data to the filesystem but this will raise one error in which     will be appended to the end of the file  To handle this below code can be used   var fs   require  fs     var file   fs createWriteStream  hello txt    file on  error   function err    Console log err      data forEach value   gt  file write    value  r n     file end          r n   is used for the new Line       n   won t help  Please refer this

User · Answer

To do what you want  using the fs createWriteStream path   options   function in a ES6 way  const fs   require  fs    const writeStream   fs createWriteStream  file txt    const pathName   writeStream path    let array     1   2   3   4   5   6   7          write each value of the array on the file breaking line array forEach value   gt  writeStream write    value  n         the finish event is emitted when all data has been flushed from the stream writeStream on  finish        gt       console log  wrote all the array data to file   pathName             handle the errors on the write process writeStream on  error    err    gt        console error  There is an error writing the file   pathName    gt    err            close the stream writeStream end

User · Answer

Remember you can access good old ECMAScript APIs  in this case  JSON stringify     For simple arrays like the one in your example   require  fs   writeFile          my json        JSON stringify myArray        function  err            if  err                console error  Crap happens

User · Answer

A simple solution is to use writeFile    require  fs   writeFile       somepath       arr map function v   return v join          join   n         function  err    console log err    Error    err    ok

[javascript] node.js - how to write an array to file

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