Does PrettyJSON send my data to a server?
No. Everything happens locally in your browser tab.
Quick JSON Refresher
- Objects:
{ "key": "value" }— keys must be strings wrapped in double quotes. - Arrays:
[1, 2, 3]— elements are ordered, zero-indexed. - Primitives:
string,number,boolean,null. No single quotes, no undefined. - Escapes:
\n,\t,\",\\,\uXXXXfor Unicode. - Comments: Not part of the JSON spec (use preprocessors or JSONC if you need them).
Common Lint Errors & Fixes
| Error | Why it happens | Quick fix |
|---|---|---|
| Trailing comma | Last item in object/array ends with a comma. | Remove the comma or add another item. |
| Unquoted key | { name: "PrettyJSON" } |
Wrap the key in ". |
| Single quotes | 'value' |
Swap to "value". |
| Duplicate keys | { "id":1, "id":2 } |
Consolidate or rename. |
| Control characters in strings | Unescaped newline, tab, backspace, etc. | Escape or remove them. |
FAQs
Can I prettify massive files?
Yes—streaming mode formats multi-megabyte blobs without freezing the UI.
Ready to make your JSON pretty?
- Paste or type your JSON.
- Click Prettify.
- Copy the clean result.
That’s it. Less time fighting brackets, more time building features—PrettyJSON has your back.