~/devtools / json
tool::json
JSON
Formatter
Format, validate, and minify JSON. Paste your JSON to get started.
// tips
Supports objects, arrays, nested structures. Use indent selector to adjust spacing.
indent:
// input
ad · 300×250
// about this tool
What is a JSON Formatter?
JSON (JavaScript Object Notation) is the most widely used data exchange format in web APIs and configuration files. While simple in concept, deeply nested or minified JSON is very difficult for humans to read.
A JSON formatter applies indentation and line breaks to compressed JSON, making it easy to read, and immediately flags any syntax errors. It also supports minifying JSON back to a single line.
Just paste and the tool formats instantly. Choose between 2- or 4-space indentation. All processing happens in your browser — no data is sent to any server.
Use Cases
- ▸Improve readability of minified JSON received from API responses
- ▸Validate and clean up config files (config.json, package.json)
- ▸Quickly locate JSON syntax errors
- ▸Minify JSON before copying to reduce payload size
- ▸Navigate deeply nested data structures
FAQ
Q. What happens if my JSON has an error?
If parsing fails, an error message is shown with the location of the problem. Common mistakes like missing quotes or trailing commas are easy to spot.
Q. Is my JSON data sent to a server?
No. All processing is done entirely in your browser via JavaScript. You can safely use JSON containing personal or sensitive data.
Q. How do I change the indentation size?
Use the indentation selector next to the Format button to choose between 2 or 4 spaces. Different teams have different style guide preferences.
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