JSON Formatter
Format, validate & minify JSON with syntax highlighting
How to use JSON Formatter
- Paste or type your JSON into the input panel on the left.
- Click 'Format' to pretty-print it with indentation, or 'Minify' to strip all whitespace.
- Use the indent selector to choose 2 spaces, 4 spaces, or tab indentation.
- Enable 'Sort keys' to alphabetically sort object keys.
- Copy the result to your clipboard or download it as a .json file.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data format used to transmit structured data between a server and a web application, or between any two systems that need to exchange data. It is language-independent and easy for both humans and machines to read.
A JSON document consists of key-value pairs, arrays, strings, numbers, booleans, and null values. Objects are enclosed in curly braces {}, arrays in square brackets [], and strings in double quotes.
Formatting JSON with proper indentation makes it far easier to read and debug. Minifying it is useful when you want to reduce payload size for API responses or configuration files — every byte saved speeds up transfers.
Frequently Asked Questions
What does the JSON formatter do?
It parses your JSON input, validates the syntax, and reformats it with consistent indentation for readability. It can also minify JSON by removing all whitespace, and sort object keys alphabetically.
Why does my JSON fail to parse?
The most common causes are: trailing commas (JSON does not allow them), single quotes instead of double quotes, unquoted keys, comments (JSON does not support comments), and unescaped special characters in strings. The error message shows the line and position where parsing failed.
What is the difference between formatting and minifying?
Formatting (also called "pretty-printing" or "beautifying") adds indentation and line breaks to make JSON human-readable. Minifying removes all unnecessary whitespace to produce the smallest possible valid JSON — useful for reducing payload size in APIs.
Is my JSON data safe when using this tool?
Yes. PXLTools processes your data locally on your device using JavaScript. Nothing is sent to any server.
Can I use this with very large JSON files?
Yes, but browser performance depends on your device. Files over 10 MB may cause brief freezing during parsing. For multi-megabyte files, consider using a command-line tool like jq for better performance.