How to use
- Paste your JSON into the input area.
- Choose indent size and click Format.
- Copy the formatted output or download as a file.
Developer
JSON Formatter
Format, validate and beautify JSON data with syntax highlighting.
JSON (JavaScript Object Notation) is a lightweight, text-based format for structured data, standardized in RFC 8259. It represents data as key-value objects and ordered arrays, and is the de facto standard for web APIs and configuration files. This tool formats, validates and minifies JSON entirely in your browser — your data is never sent to a server.
Indent:
FAQ
What is JSON formatting?
JSON formatting (also called pretty-printing or beautifying) adds indentation and line breaks to JSON text so its structure is easy to read. Formatting only changes whitespace — the underlying data stays exactly the same. A 2-space indent is the most common convention.
Why is my JSON invalid?
The most common causes are trailing commas after the last item, single-quoted strings (JSON requires double quotes), unquoted object keys, and comments. All four are common in JavaScript but forbidden by the JSON specification (RFC 8259).
What is the difference between formatting and minifying?
Formatting adds whitespace to make JSON readable by humans; minifying removes all optional whitespace to make the payload as small as possible. Use formatted JSON for editing and debugging, and minified JSON for production APIs and storage.
Is my JSON uploaded to a server?
No. This tool runs entirely in your browser using JavaScript — paste, format and validate even with the network disabled. Nothing you enter is transmitted or stored anywhere.