How can I pretty-print JSON using node.js?

This seems like a solved problem but I am unable to find a solution for it.

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 the开发者_运维知识库re a way in Node.js to write well formatted JSON to file ?

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,
}
*/

See the JSON.stringify() docs at MDN, Node fs docs

I think this might be useful... I love example code :)

var fs = require('fs');

var myData = {
  name:'test',
  version:'1.0'
}

var outputFilename = '/tmp/my.json';

fs.writeFile(outputFilename, JSON.stringify(myData, null, 4), function(err) {
    if(err) {
      console.log(err);
    } else {
      console.log("JSON saved to " + outputFilename);
    }
}); 

If you just want to pretty print an object and not export it as valid JSON you can use console.dir().

It uses syntax-highlighting, smart indentation, removes quotes from keys and just makes the output as pretty as it gets.

const jsonString = `{"name":"John","color":"green",
                     "smoker":false,"id":7,"city":"Berlin"}`
const object = JSON.parse(jsonString)

console.dir(object, {depth: null, colors: true})

Under the hood it is a shortcut for console.log(util.inspect(…)). The only difference is that it bypasses any custom inspect() function defined on an object.

If you don't want to store this anywhere, but just view the object for debugging purposes.

console.log(JSON.stringify(object, null, "  "));

You can change the third parameter to adjust the indentation.

I know this is old question. But maybe this can help you