Install

npm install json.filed

Load module

var jf = require( 'json.filed' );

var jsonfile = jf.filed( '/path/to/jsonFile' );

jsonfile
.read( ( json ) => { < your code > } )
.exec();

For example :

.read( ( json ) => { console.log( json.msg ) } )

Result :

$ node exampleOnHow2Use.js
hello world

 jsonfile
 .write( <json object to write > )
 .exec();

For example :

 .write( { msg: 'good after noon' } )

Result :

$ cat data.json
{"msg":"good after noon"}