JSON Formatter
Free Json Formatter for tools. Free online tool with accurate results using verified formulas. Includes worked examples, FAQ, and instant calculations.
Formula
Format: JSON.stringify(JSON.parse(input), null, 2) | Minify: JSON.stringify(JSON.parse(input))
The tool first parses the input to validate JSON syntax, then serializes it either with indentation or as a compact one-line string.
Frequently Asked Questions
Why format JSON?
Formatted JSON adds indentation and line breaks so you can inspect nested objects, arrays, and keys quickly. It is much easier to debug than a single minified line.
Why minify JSON?
Minified JSON removes unnecessary whitespace to reduce payload size. That makes network transfers and storage more efficient, especially in production environments.
What makes JSON invalid?
Common errors include trailing commas, unquoted keys, single quotes instead of double quotes, missing braces or brackets, and unescaped special characters inside strings.
Can JSON include comments?
Standard JSON does not allow comments. If you need comments in configuration data, use a different format such as YAML or a JSON-compatible extension like JSON5.
Does this formatter send my JSON to a server?
No. The formatter runs in your browser. Your JSON is parsed, formatted, and validated client-side.
What is JSON Schema?
JSON Schema is a vocabulary for annotating and validating JSON documents. It defines expected structure, data types, required fields, value constraints, and patterns. It is widely used for API documentation, form validation, and configuration file validation.