ajduke

fs = require('fs');
path = 'data/myfile.txt';
fs.exists(path, function(exists){
  if(exists){
    console.log('yes file exists...');
  } else {
    console.log('It doesnt exists');
  }
})

ajduke

fs.appendFile('myfile.txt', 'this content goes at end of the file', function(err){
  if(err) {
    console.log('Error is thrown', err); throw err;
  }
  console.log('data is appended !!');
})

ajduke

fs = require("fs");
path = "data/myfile.txt";
data = "This content is written from Node program";

result =fs.writeFileSync(path, data);

console.log('written contents are : ' + result);

ajduke

fs = require("fs");
path = "myfile.txt";
data = "This content is written from Node program";

fs.writeFile(path, data, function(error){
  if error
    console.error("error: " + error.message);
  else
    console.log("Successful Write to " + path);
})

ajduke

res= <destination file stream>; // It can be standard io, another file stream, etc
readStream = fs.createReadStream(filename);

readStream.on('open', function(){
  readStream.pipe(res);
});

readStream.on('error', function(err){
  res.end(err);
});

ajduke

//read it synchronously
content= fs.readFileSync('package.json', 'utf-8');
console.log(content);

ajduke

fs= require(‘fs’)
//read it asynchronously
fs.readFile('package.json', function(err, res){
  if(err){
    console.log('Error while reading the file content ');
  }
  console.log('file contents- ' + res)
})

ajduke

{"name":"ajduke"}

ajduke

Default behaviour....
{"myField":"value1","myAnotherField":"value2"}

Fields with lower case and dashes...
{"my-field":"value1","my-another-field":"value2"}

Fields with lower case and dashes...
{"My Field":"value1","My Another Field":"value2"}

ajduke

package in.ajduke.ap013;

import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class Example34 {
  public static void main(String[] args) {
    
    Gson gson = new Gson();