How do I pretty-print JSON?

In JavaScript, use JSON.stringify(data, null, 2) for 2-space indentation. For quick formatting without code, paste the JSON into the JSON Formatter tool for instant pretty-printing with syntax validation.

Why is my JSON invalid?

Common causes: trailing commas after the last item, single quotes instead of double quotes, unquoted property names, comments (not allowed in JSON), or missing commas between items.

What is the difference between JSON and JavaScript objects?

JSON is a strict subset of JavaScript object notation. JSON requires double quotes on all keys and strings, doesn't allow trailing commas, doesn't support comments, functions, or undefined, and only allows strings, numbers, booleans, null, arrays, and objects as values.

How to Format and Pretty-Print JSON

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