JSON pretty print using JavaScript

JSON pretty print using JavaScript

Is there a JavaScript JSON pretty print library (with colors, indentation, etc.)?

Source: Tips4all

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Tips For AllApril 9, 2012 at 3:39 AM
With native JSON, there's no need to use a library, since pretty-printing is implemented natively.

var obj = {a:1, 'b':'foo', c:[false,null, {d:{e:1.3e5}}]};
var str = JSON.stringify(obj, undefined, 2); // indentation level = 2

See the MDN Docs for further details (e.g. on the second argument);

If you need syntax highlighting, you might use some regex magic like so:

function syntaxHighlight(json) {
if (typeof json != 'string') {
json = JSON.stringify(json, undefined, 2);
}
json = json.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
var cls = 'number';
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = 'key';
} else {
cls = 'string';
}
} else if (/true|false/.test(match)) {
cls = 'boolean';
} else if (/null/.test(match)) {
cls = 'null';
}
return '<span class="' + cls + '">' + match + '</span>';
});
}

See in in action (jsfiddle)
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Tips For AllApril 9, 2012 at 3:39 AM
Douglas Crockford's JSON in JavaScript library will pretty print JSON via the stringify method.

You may also find the answers to this older question useful: How to pretty-print JSON script?
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Tips For AllApril 9, 2012 at 3:39 AM
Pretty Diff uses a heavily modified form of js-beautify. Try it out and see if it does all that you need:

http://prettydiff.com/
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