Free Online JSON Formatter
Paste messy or minified JSON and beautify it into clean, indented output in one click, right in your browser.
No sign-up to start · Runs in your browser
How to format JSON
- 1
Paste your JSON
Drop raw, minified, or messy JSON into the input editor. You can also paste from your clipboard or load a file.
- 2
Click Format
JSON Copilot pretty-prints the data with consistent indentation and instantly flags any syntax errors with line numbers.
- 3
Copy or explore
Copy the formatted output, download it, or switch to the tree and mind-map views to explore the structure.
Why use JSON Copilot to format
Private by default
Formatting runs 100% client-side. Your JSON never leaves your device.
Instant error detection
Invalid JSON is caught as you type, with clear, line-level messages.
Flexible indentation
Choose 2-space or 4-space indentation to match your project style.
Built for big files
A Monaco-based editor handles large documents.
Frequently asked questions
Is the JSON formatter free?
Yes. Formatting, minifying, and validation are free and require no account. AI features use credits, with 1,000 free on signup.
Is my data safe?
Yes. JSON formatting runs entirely in your browser. Your data is never sent to a server unless you use an AI feature or save a project.
What is the difference between format and beautify?
They are the same thing: both convert compact JSON into readable, indented output. "Beautify" and "pretty-print" are common names for formatting.