How can I pretty-print JSON using node js

0 votes

Basically, I read a JSON file, change a key, and write back the new JSON to the same file. All works, but I loose the JSON formatting.So, instead of:

{
  name:'test',
  version:'1.0'
}

I get

{name:'test',version:'1.1'}

Is there a way in Node.js to write well formatted JSON to file ?

Jul 12, 2020 in Node-js by kartik
• 37,520 points
2,358 views

1 answer to this question.

0 votes

Hello @kartik,

JSON.stringify's third parameter defines white-space insertion for pretty-printing. It can be a string or a number (number of spaces). Node can write to your filesystem with fs. Example:

var fs = require('fs');

fs.writeFile('test.json', JSON.stringify({ a:1, b:2, c:3 }, null, 4));
/* test.json:
{
     "a": 1,
     "b": 2,
     "c": 3,
}
*/

Hope it helps!!

Thank you!!

answered Jul 12, 2020 by Niroj
• 82,760 points

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