NodeJS Write Files

0-NODE-WRITE-FILES.MD

NODEJS WRITE FILES

https://code-boxx.com/write-files-nodejs/

LICENSE

Copyright by Code Boxx

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

1-write-async.js

// (A) FILE SYSTEM MODULE
const fs = require("fs");

// (B) WRITE TO FILE
fs.writeFile("demoA.txt", "Hello", err => {
  if (err) { console.log(err); }
  console.log("Written");
});

// (C) APPEND TO FILE
fs.appendFile("demoA.txt", "Goodbye", err => {
  if (err) { console.log(err); }
  console.log("Appended");
});

2-write-sync.js

// (A) FILE SYSTEM MODULE
const fs = require("fs");

// (B) WRITE FILE
try { fs.writeFileSync("demoB.txt", "Hello"); }
catch (err) { console.log(err); }
console.log("Written");

// (C) APPEND FILE
try { fs.appendFileSync("demoB.txt", "Goodbye"); }
catch (err) { console.log(err); }
console.log("Appended");

3-write.js

// (A) FILE SYSTEM MODULE
const fs = require("fs");

// (B) OPEN & WRITE FILE
fs.open("demoC.txt", "a", (err, handle) => {
  // (B1) ON ERROR
  if (err) { console.log(err); }

  // (B2) WRITE TO FILE
  else {
    fs.write(handle, "HELLO", (err, bytes) => {
      if (err) { console.log(err.message); }
      else { console.log(`Written - ${bytes} bytes`); }
    });
  }
});

4-stream-async.js

// (A) ARRAY TO WRITE
var data = ["Apple", "Banana", "Cherry"];

// (B) FILE SYSTEM + STREAM
const fs = require("fs"),
      stream = fs.createWriteStream("demoD.txt");
// stream = fs.createWriteStream("demoD.txt", {"flags": "a"});

// (C) WRITE TO FILE
stream.on("finish", () => console.log("WRITTEN"));
data.forEach((v,i) => {
  stream.write(v + "\r\n");
  if (i==2) { stream.end(); } // close the stream!
});