javascript - Node File System Create Directory and files on post route -

i have dashboard generates json data , saves .json file. written in php various reasons have re-written application in node. code below takes post data , should check see if file exists if update if not should create file , directory.

however seems create first file , cannot fathom why doesn't create subsequent files post route called once each post.

the post method looks this

$.ajax({     type : "post",     url : '/save/',     datatype : 'json',     data : {     category : settings.category_id,     name : settings.campaignid,     json : json.stringify(settings)     } }); 

i have debugged , when called correct file paths passed if file isn't being written data.

during debugging using node-inspector , nodemon code loops through requested new file names , gives me error code enoent, should follow create file path.

if know node , file system module , feel helping me out amazing if it's pointing me in direction of more tutorials, ... great!

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'use strict'  const fs = require('fs'); const path = require('path'); const express = require('express'); const router = express.router();  /* save data */ router.post('/', function(req, res) {    if (!(req.body.json && req.body.name && req.body.category)) {     res.sendstatus(400);     return;   }    let dir = 'public/saveddata/' + req.body.category;   let filepath = dir + '/' + req.body.name + '.json';    fs.access(filepath, function(error) {     console.log(filepath);      console.log(error.code);     if (error) {         if (error.code == 'enoent') {             console.log(error.code);             //debugger;             // create file since doesn't exist             createfile(req, res, filepath);          } else {             //debugger;             console.log('access error:', error);             res.sendstatus(500);         }     } else {         //debugger;         // update file since exists         updatefile(req, res, filepath);     } }); });  function createfile(req, res, filepath) { try {     let json = json.parse(req.body.json);     let output = json.stringify([json], null, 4);      fs.mkdir(path.dirname(filepath), function(error) {         if (error) {             if (error.code == 'eexist') {                 updatefile(req, res, filepath);             } else {                 res.sendstatus(500);                 console.log('create file error :', error);             }         } else {             fs.writefile(filepath, output, function(error) {                 if (error) {                     res.sendstatus(500);                     console.log('write file error :', error);                 } else {                     res.sendstatus(200);                     console.log('data saved');                 }             });         }     }); } catch (error) {     res.sendstatus(500);     console.log(error); } }  function updatefile(req, res, filepath) {  try {     fs.readfile(filepath, 'utf-8', function(error, data) {         if (error) {             res.sendstatus(500);             console.log('update error:', error);         } else {             try {                 let newjson = json.parse(req.body.json);                 let jsonarray = json.parse(data);                 let output;                  jsonarray.push(newjson);                 output = json.stringify(jsonarray, null, 4);                  fs.writefile(filepath, output, function(error) {                     if (error) {                         res.sendstatus(500);                         console.log(error);                     } else {                         res.sendstatus(200);                         console.log('data saved');                     }                 });             } catch (error) {                 res.sendstatus(500);                 console.log(error);             }         }     }); } catch (error) {     res.sendstatus(500);     console.log(error); } }  module.exports = router; 

instead of checking if file exists, should try write flags wx, creates file fails if exist. way won't subjecting race conditions. suggest package mkdirp, not emit error if directory exists.

router.post('/', (req, res) => {   if (!(req.body.json && req.body.name && req.body.category)) {     res.sendstatus(400);     return;   }    const dirpath  = `public/saveddata/${req.body.category}`;   const filepath = `${dirpath}/${req.body.name}.json`;    mkdirp(dirpath, err => {     if (err) {       console.error('mkdirp failed', err);       return res.sendstatus(500);     }      const output = json.stringify([json.parse(req.body.json)]);      fs.writefile(filepath, output, { flags: 'wx' }, err => {       if (err) {         console.error('writefile failed', err);         return res.sendstatus(500);       }        console.log('data saved');       res.sendstatus(200);     });   ); }); 

make sure sanitize req.body.name , req.body.category parameters, since expose filesystem unintentional overwrites.