JSON Formatter & Validator

It runs your input through a real JSON parser, so it catches the errors that break JSON.parse() in any language: trailing commas after the last item in an object or array, single quotes instead of double quotes, missing quotes around object keys, unescaped control characters inside strings, and unclosed brackets or braces. The error message tells you what went wrong and, where available, which line to check.

Format (beautify) adds indentation and line breaks so nested objects and arrays are easy to read — useful while you're developing, debugging a response, or reviewing a config file. Minify strips all whitespace and line breaks, producing the smallest possible payload. Use minify for JSON you're sending over the wire in production, like API request bodies or config files bundled with an app, where every byte counts.

They control how JSON.stringify() indents nested levels in the formatted output — purely a readability preference. 2 spaces is the most common convention in JavaScript/JSON codebases, 4 spaces matches some Python or Java style guides, and tabs let each person's editor render the width they prefer. It has no effect on the data itself, only on how the formatted text looks.

No. This checks that your input is syntactically valid JSON — correct brackets, quoting, commas, and value types — not that it matches a particular structure, has required fields, or uses correct data types for your application. If you need to validate against a specific shape, you'll want a JSON Schema validator instead.

Yes. Formatting, minifying, and validation all run entirely in your browser using JavaScript's built-in JSON.parse() and JSON.stringify() — nothing you paste is sent to a server, logged, or stored anywhere. You can safely use it with real API responses, config files, or other sensitive data.