JSON Formatter
Pretty-print JSON with proper indentation, and catch syntax errors.
Why formatted JSON matters
Minified API responses and config files are unreadable at a glance. Reindenting reveals the actual nesting of objects and arrays, making it far easier to spot a missing bracket or find the value you need.
Choosing indentation
2 spaces is the modern default in most JS/JSON tooling and keeps deeply nested structures narrower. 4 spaces can be easier to scan visually. Both are equally valid JSON — it is purely a readability preference.
Common Mistakes to Avoid
Assuming formatting validates your JSON
Solution:
This tool assumes your JSON already parses correctly and focuses on layout. If you are not sure your JSON is valid, use the JSON Validator first to catch the exact error.
Formatting extremely large payloads
Solution:
Very large JSON files can be slow to reformat in the browser. Consider trimming to the relevant section first if you only need to inspect part of a large response.
Frequently Asked Questions
It expects valid JSON and will show an error if parsing fails, but for detailed error location, use the JSON Validator.
No — formatting happens entirely in your browser.
Why formatted JSON matters
Minified API responses and config files are unreadable at a glance. Reindenting reveals the actual nesting of objects and arrays, making it far easier to spot a missing bracket or find the value you need.
Choosing indentation
2 spaces is the modern default in most JS/JSON tooling and keeps deeply nested structures narrower. 4 spaces can be easier to scan visually. Both are equally valid JSON — it is purely a readability preference.