Appending JSON file in node

Question

I have a JSON file that looks like this

{
    "name": "John Doe",
    "address": "9 School Rd"    
}

how do I append this file in node.js? When I try fs.appendFile the JSON file ends up looking like this

{
    "name": "John Doe",
    "address": "9 School Rd"    
}, 
"nickname": "shmee"

however this is obviously not what I want it to look like. Thanks for your help!

So you want to add the "nickname" property to the file?

Mike Cluck
– Mike Cluck

2015-07-15 20:28:06 +00:00
Commented Jul 15, 2015 at 20:28 — Mike Cluck
– Mike Cluck, Commented Jul 15, 2015 at 20:28

Mike Cluck · Accepted Answer · 2015-07-15 20:31:30Z

1

A very simple way of doing this would be to parse in the object as JSON then save back the stringified version to the file.

var data = require('./my-data-file.json'); // Will automatically parse JSON
data.nickname = "shmee";
fs.writeFile('./my-data-file.json', JSON.stringify(data, null, 4), options, callback);

The options and callback are optional but I suggest writing a callback because that will let you know when the data has been saved.

answered Jul 15, 2015 at 20:31

Mike Cluck

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1 Comment

Lee Dennis Over a year ago

can you do this with variables? for example if nickname was instead a key, and "shmee" was a value could i do data[key] = value; and then the rest

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