pretty-print JSON using JavaScript

Question

How can I display JSON in an easy-to-read (for human readers) format? I\'m looking primarily for indentation and whitespace, with perhaps even colors / font-styles / etc.

Answer 1

To highlight and beautify it in HTML using Bootstrap:

function prettifyJson(json, prettify) {
    if (typeof json !== 'string') {
        if (prettify) {
            json = JSON.stringify(json, undefined, 4);
        } else {
            json = JSON.stringify(json);
        }
    }
    return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g,
        function(match) {
            let cls = "";
            if (/^"/.test(match)) {
                if (/:$/.test(match)) {
                    cls = "";
                } else {
                    cls = "";
                }
            } else if (/true|false/.test(match)) {
                cls = "";
            } else if (/null/.test(match)) {
                cls = "";
            }
            return cls + match + "";
        }
    );
}