Question 1

What is JSON Formatter?

Accepted Answer

JSON Formatter is a free online tool that helps you format, validate, beautify and minify JSON data. Simply paste your JSON, and it will be formatted instantly with proper indentation and syntax highlighting.

Question 2

How to format JSON online?

Accepted Answer

To format JSON online: 1) Go to json.fedrr.com, 2) Paste your JSON data into the text editor, 3) Click the 'Format' button. Your JSON will be instantly formatted with proper indentation. You can also load JSON from a URL or file.

Question 3

Is this JSON formatter free?

Accepted Answer

Yes, this JSON formatter is completely free to use. There are no ads, no tracking, and no limitations. You can format, validate, and minify as much JSON as you need.

Question 4

Can I validate JSON online?

Accepted Answer

Yes, the tool automatically validates your JSON as you type. If there are any syntax errors, they will be highlighted immediately with a clear error message showing the exact position of the error.

Question 5

How large JSON files can I open?

Accepted Answer

Files up to about 10 MB work smoothly. You can paste JSON, drag & drop a file, or load it from a URL. The editor and tree viewer stay responsive on large inputs.

Question 6

Can I undo changes or see previous versions?

Accepted Answer

Yes. The formatter keeps a history of up to 30 recent operations (Format, Sort Keys, Auto-format on paste) — up to 5 MB total — and lets you undo or time-travel to any previous state in one click. History is persisted between sessions.

Question 7

Can I compare two JSON documents?

Accepted Answer

Yes. The Diff tab shows a side-by-side comparison with a tree-based view and filters for added, removed and changed entries. You can also hide unchanged keys to focus on differences.