Free developer utility
JSON Formatter
Paste JSON to pretty print, minify, validate, copy, and download it. The tool runs locally in your browser, so API responses and configuration snippets are not uploaded to a server.
When to use this JSON formatter
Use it when an API response, analytics payload, schema markup, webhook body, or configuration file is hard to scan. Formatting makes nested objects readable; minifying removes whitespace when you need a compact payload.
Common JSON syntax issues
- Trailing commas after the last array item or object property.
- Single quotes instead of double quotes around property names or strings.
- Missing closing brackets, braces, or quotes.
- Comments inside JSON files. Standard JSON does not allow comments.
Related tools
Text Cleaner, Word Counter, SEO Title Preview, and All Tools Index.
FAQ
Does this JSON formatter upload my data?
No. Formatting, minifying, and validation run in your browser.
Can I use this for API responses?
Yes. Paste a JSON response to validate the structure, pretty print it, or minify it before saving.
What happens when the JSON is invalid?
The validator shows the browser JSON parse error so you can fix syntax issues such as trailing commas or missing quotes.