[json] 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 there a way in Node.js to write well formatted JSON to file ?

This question is related to json node.js

The answer is


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

JSON string

var jsonStr = '{ "bool": true, "number": 123, "string": "foo bar" }';

Pretty Print JSON

JSON.stringify(JSON.parse(jsonStr), null, 2);

Minify JSON

JSON.stringify(JSON.parse(jsonStr));

what about this?

console.table(object)

sample


Another workaround would be to make use of prettier to format the JSON. The example below is using 'json' parser but it could also use 'json5', see list of valid parsers.

const prettier = require("prettier");
console.log(prettier.format(JSON.stringify(object),{ semi: false, parser: "json" }));

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})

Screenshot of logged object

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.