Is my JSON sent anywhere?

No. Formatting is done in the browser. Open the Verify Security panel and run the self-check to confirm zero network requests.

Does it change numbers?

No. Numbers are handled as text, so precision and trailing zeros are preserved.

What happens on invalid JSON?

You get a message naming the line and column, with a caret pointing at the offending character.

Is there a record limit?

Guests can format up to 500 records; a free account raises it to 50,000.

Private JSON formatter (no upload)

Paste JSON and format it with 2 spaces, 4 spaces, Tab, or Minify. The formatting runs in your browser, so tokens, payloads, and customer records in the JSON never leave your machine.

Formatting does not change the data: large integers such as 12345678901234567890 and values like 1.50 are kept exactly as written, unlike tools that parse through a number type and lose precision.

Formatted JSON

Paste JSON and press Format

Formatting happens in this browser. Numbers are kept exactly as written.

How to use this tool

1Switch the tool to Format JSON if it is not already open.
2Paste your JSON.
3Pick an indent or Minify.
4Copy the result or download a .json file.

Frequently asked questions

Is my JSON sent anywhere?: No. Formatting is done in the browser. Open the Verify Security panel and run the self-check to confirm zero network requests.
Does it change numbers?: No. Numbers are handled as text, so precision and trailing zeros are preserved.
What happens on invalid JSON?: You get a message naming the line and column, with a caret pointing at the offending character.
Is there a record limit?: Guests can format up to 500 records; a free account raises it to 50,000.

Private by design

This tool runs entirely in your browser. Files, tables, and results are never uploaded to a server — you can even disconnect your network and keep working. See the Privacy Policy.