What "Fix common mistakes" repairs
- Trailing commas:
[1, 2,]→[1, 2] - Single quotes and unquoted keys:
{a: 'x'}→{"a": "x"} - Comments (
//and/* */) and Python values (None,True,False)
How to use the JSON Formatter & Validator tool
- Paste JSON (or drop a .json file).
- Format, minify, sort keys or convert to CSV.
- Copy or download the result.
Why SaralKit?
- Free forever: no "credits", no trial, no premium tier, no watermark and no daily limit.
- No account, ever: nothing to sign up for. Just open the page and use it.
- No data stored: your files and the numbers you type are processed by your own browser. We never upload, store or see them.
- Works offline: once the page has loaded, most tools keep working without internet.
- Open source: anyone can read the code on GitHub.
Frequently asked questions
Is my JSON uploaded anywhere?
No. Formatting and validation run in your browser with the built-in JSON parser. That makes it safe for API responses, tokens and config files.
Why is my JSON invalid?
The usual causes are a trailing comma, single quotes instead of double quotes, unquoted keys or comments. The error message shows the line and column. Try "Fix common mistakes" for these.
Can it convert JSON to CSV?
Yes, if the JSON is an array of objects (like most API results). Each object becomes a row and keys become columns.