How to format JSON online (pretty-print) for free

Formatting JSON (also called pretty-printing or beautifying) adds indentation and line breaks so nested objects are readable. You can do it in an editor, a CLI, or a free online JSON formatter that runs in your browser.

Format JSON with Jigglify (30 seconds)

1. Open the JSON formatter.
2. Paste your JSON into the input panel (or click Sample).
3. Keep the Format tab selected.
4. Click the arrow to process.
5. Copy the pretty-printed output, or switch to Tree view to explore nested keys.

Format vs minify vs validate

Format makes JSON human-readable. Minify removes whitespace for smaller payloads. Validate checks syntax without rewriting. Use Format for debugging, Minify before shipping compact API bodies, and Validate when you only need a pass/fail check.

Why format JSON locally?

Online formatters that upload your text can expose tokens, PII, or internal URLs. Jigglify processes JSON in the browser so the content stays on your device - useful for auth responses, customer exports, and staging configs.

Tips for cleaner JSON

• Always use double quotes for keys and strings.
• Remove trailing commas before the last property or array item.
• Prefer ISO 8601 strings for dates instead of ad-hoc formats.
• After formatting, skim the tree for unexpected nulls or nested arrays.

Pretty-print JSON free - format locally with no account and no upload.
Open the free JSON tool →

Related: What is JSON? · Common JSON errors