Is my JSON uploaded anywhere?

No. Parsing uses the browser native JSON API and runs entirely on your machine.

How large a file can it handle?

As large as your tab can hold — tens of megabytes usually work, but the browser runs out of memory before the parser does.

Format, validate, and beautify JSON for easier reading and debugging.

Processed locally

About JSON Formatter

Uses the browser's native JSON API to format and minify, with optional key sorting and custom indentation. Everything runs locally.

1
Format, minify and key sorting share one input: changing the indent or the sort toggle re-runs instantly, with no re-pasting.
2
Validation uses the browser native JSON parser, so an error comes with the position that broke.
3
Key sorting walks nested objects, which makes two structurally similar payloads easy to compare.

Format & Minify

Auto-indent and organize HTML markup for better readability.

Format & Minify

Minify HTML by removing extra spaces and non-essential characters.

Format & Minify

Minify or prettify CSS code for production and maintenance workflows.

Format & Minify

Beautify JavaScript code with consistent indentation and spacing.

Format & Minify

Minify JavaScript to reduce file size for faster page delivery.

Format & Minify

Compress JSON by removing unnecessary whitespace and line breaks.

Format & Minify

Sort JSON object keys alphabetically to keep structure consistent.

Format & Minify

Format SQL queries to improve readability and team consistency.

Format & Minify