Input
1
Ln 1 Col 1
Indent
Output
// output appears here
—

Jsonic's JSON Formatter pretty-prints raw or minified JSON with consistent indentation, making it easy to read, inspect, and debug. Paste any JSON, click Format to beautify it with 2-space or 4-space indentation, then switch to Tree view to explore nested objects and arrays interactively. Click Minify to compress the JSON back into a single line. All processing runs in your browser — your JSON is never uploaded.

How to format JSON online

  1. Paste your JSON into the left panel, or use the upload button for a file.
  2. Click Format to pretty-print the JSON with standard indentation.
  3. Optionally click Tree to explore the structure in a collapsible view.
  4. Click Minify to compress the JSON into a compact single-line format.
  5. Use Copy or Download to save the result.

FAQ

What does a JSON formatter do?

A JSON formatter (also called a JSON beautifier or pretty printer) takes minified or compact JSON and rewrites it with consistent indentation and line breaks. This makes the structure readable and helps you spot nesting errors, missing commas, or typos.

Can it validate JSON syntax?

Yes. When you click Format, the formatter first parses your JSON. If there is a syntax error — such as a trailing comma, unquoted key, or missing bracket — it shows a specific error message with the line and column number.

What indentation options are available?

You can choose 2-space or 4-space indentation. Both are standard; 2 spaces is common in web development (JavaScript, TypeScript), while 4 spaces is common in Python projects.

Can I format a large JSON file?

Yes. Use the file upload button to load JSON files from disk. For very large files (tens of MB), performance depends on your device, but typical API responses and config files work instantly.

How is formatting different from minifying?

Formatting adds whitespace to make JSON human-readable. Minifying removes all whitespace to produce the smallest possible string. Both operations preserve the exact same data.

Is my JSON data uploaded anywhere?

No. Formatting, validation, and minification all run entirely in your browser. Nothing is sent to a server.