JSON Formatter & Beautifier

A JSON formatter (also called a JSON beautifier or pretty printer) takes compact or minified JSON and adds proper indentation and line breaks to make it human-readable. It helps developers quickly inspect API responses, configuration files, and data structures.

A sample JSON looks like: { "name": "John", "age": 30, "email": "john@example.com", "hobbies": ["coding", "reading"], "address": { "city": "Mumbai", "country": "India" } }. JSON supports strings, numbers, booleans, arrays, objects, and null values.

Yes, 100%. JSONDev.in processes all JSON entirely in your browser using JavaScript. No data is ever sent to any server. You can even use it offline once the page has loaded.

2 spaces is the most common convention for JSON files (used by npm, most APIs, and JSON.stringify defaults). 4 spaces is used by some style guides. Tabs save bytes but are less portable. For minified production JSON, use 0 indentation.

Common JSON errors include: trailing commas after the last item in an object or array, single quotes instead of double quotes, unquoted keys, comments (JSON does not support comments), and missing or extra brackets/braces.

Use JSON.stringify(data, null, 2) to format JSON with 2-space indentation. To parse a JSON string, use JSON.parse(jsonString). For example: const formatted = JSON.stringify(JSON.parse(rawJson), null, 2).