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When I call JSON.stringify() on a complex object in JavaScript, it produces a string with lots of escape sequences (\", \\", etc.).

How can I make it create a human-readable JSON string instead? I.e., one that you can copy/paste into one of the many JSON validators on the web?

To clarify, my #1 concern is removing the escape sequences.

When I call JSON.stringify() on a complex object in JavaScript, it produces a string with lots of escape sequences (\", \\", etc.).

How can I make it create a human-readable JSON string instead? I.e., one that you can copy/paste into one of the many JSON validators on the web?

To clarify, my #1 concern is removing the escape sequences.

• javascript
• json

Share Improve this question Follow edited Mar 11, 2017 at 13:51 Peter Mortensen 31.6k2222 gold badges109109 silver badges133133 bronze badges asked Jan 7, 2016 at 6:46 INBINB 17511 gold badge11 silver badge66 bronze badges 1

• are you using jquery or other framework? – Peter P. Commented Jan 7, 2016 at 6:47

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5 Answers 5

Sorted by: Reset to default 13

You can use the replacer. The second parameter provided by JSON.stringify.Replacer could be a function or array.

In your case we can create a function which replaces all the special characters with a blank space.The below example replaces the whitespaces and underscores.

function replacer(key, value) {
  return value.replace(/[^\w\s]/gi, '');
}

var foo = {"a":"1","b":2};
var jsonString = JSON.stringify(foo, replacer);

If you simply want to replace the one special character, use:

JSON.stringify({ a: 1, b: 2 }, null, '\t');

For more information on replacer, check the MDN page JSON.stringify().

ECMAScript 2021, the 12th edition

You can use

JSON.stringify() and replaceAll()

Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replaceAll

    const foo = {
        A: 'This is my \\',
        B: 'This \\ is his \\'
    };

    let jsonString = JSON.stringify(foo, null, 2);

    document.write(jsonString);

    jsonString = jsonString.replaceAll('\\', '');

    document.write('<pre>' + jsonString + '</pre>');

You can use formatting on JSON.stringify.

'\t' represent a tab character

JSON.stringify({ uno: 1, dos: 2 }, null, '\t');
// returns the string:
// '{
//     "uno": 1,
//     "dos": 2
// }'

JSON.stringify(value[, replacer[, space]])

Space: A String or Number object that's used to insert white space into the output JSON string for readability purposes.

Replacer: A function that alters the behavior of the stringification process, or an array of String and Number objects that serve as a whitelist for selecting the properties of the value object to be included in the JSON string. If this value is null or not provided, all properties of the object are included in the resulting JSON string.

So you can do

var x = {"name":"void", "type":"O'\"Rielly"};
document.write(JSON.stringify(x, null, ' '));

I would use JSON.stringify(),

The JSON.stringify() method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified, or optionally including only the specified properties if a replacer array is specified.

with four spaces and an appropriate display environment with <pre>...</pre>.

The result is good, readable, and copyable for other use.

var object = { name: 'void', type1: "O'\"This", type2: 'O\'That', a: [1, 2, 3] };
document.write('<pre>' + JSON.stringify(object, 0, 4) + '</pre>');

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