Beautify, validate, minify, and compare JSON instantly. Everything runs locally in your browser.
Input JSON
Paste, upload, or drag a .json file
Formatted Output
Editable result, ready to copy or download
Tell us whether the JSON Formatter workflow felt clear, or report what slowed you down.
A JSON formatter (also called a JSON beautifier or JSON pretty printer) takes raw, compact, or unformatted JSON and restructures it with proper indentation and line breaks so it becomes easy to read and understand. Whether you are debugging an API response, reviewing a config file, or inspecting data from a third-party service, a formatted JSON view saves significant time.
This tool also acts as a JSON validator. It detects syntax errors and reports useful line or position details when the browser parser provides them.
.json file, or load directly from a URL.Beautify & minify
Pretty-print with 2 or 4 space indent, or collapse to a single line.
Validate syntax
Instantly check whether JSON is well-formed with helpful error hints.
Compare JSON
Structural diff for two pastes—additions, removals, and changes per path.
Flexible input
Paste, upload a .json file, or load from a URL when the host allows CORS.
Sort keys
Optionally alphabetize object keys at every level for stable diffs and reviews.
Private & offline-capable
Parsing and formatting run in your browser; optional drafts stay on this device only.
JSON formatting (beautify / pretty print) adds indentation and line breaks so nested objects and arrays are easier to read. The values stay the same—only the layout changes.
Paste JSON in the Input JSON panel and click Validate. You get a compact success message or a clear error, often with line and column hints from the browser parser.
Click Compare JSON, paste the original on the left and modified on the right, then Compare. Each editor shows the diff lines that involve that copy; the combined list is below.
Core formatting, validation, and compare run locally in your browser. Loading a URL fetches that resource from your machine. Routine site analytics may still apply; see the Privacy Policy.
Yes. Turn on Sort keys before beautifying to alphabetize object keys at every level, which makes review and comparison easier.
Yes. After beautifying, minifying, validating, or comparing JSON, click Download to save the current result locally.
+ added appears only in the modified JSON, - removed only in the original, and ~ changed when a value or type differs at the same path. Paths look like $.field or $.items[0].
With focus in an editor, Ctrl+Enter (Cmd+Enter on Mac) runs the active action: Beautify in format workflow, or Compare when you are in Compare JSON mode.