JSON Formatter
Format, minify, and validate JSON with syntax highlighting and a tree view.
How to use
- Paste your JSON into the input area.
- Choose Format, Minify, or Validate.
- Review the result in the tree view or text output.
- Copy or download the processed JSON.
About this tool
JSON Formatter is a free online utility that lets developers beautify, minify, and validate JSON documents instantly. Whether you are debugging an API response or cleaning up a configuration file, it provides readable indentation, collapsible nodes, and clear error reporting.
Features
Pretty-print with configurable indentation, one-click minification, live syntax validation, an interactive tree view for exploring nested structures, and copy or download buttons for the output. Syntax highlighting makes strings, numbers, booleans, and null values easy to distinguish at a glance.
Use cases
Inspecting REST API responses during development, reviewing JSON configuration files, preparing payloads for automated tests, and sharing properly formatted snippets with teammates in code reviews or bug reports.
Why choose this tool
It runs fully in the browser with no uploads, so sensitive data stays on your machine. The interface is fast, mobile friendly, and requires no sign-up, making it a reliable daily companion for backend and frontend engineers alike.
FAQ
- Is my JSON data sent to a server?
- No. All processing happens entirely in your browser, so your data never leaves your device.
- What is the maximum size supported?
- Most modern browsers handle several megabytes without issue, though very large files may slow down the tree view.
- Can it detect syntax errors?
- Yes. The validator highlights the line and column where the parser failed and shows a descriptive error message.