How do I format JSON online for free?

Paste your JSON into the formatter above, pick an indentation (2 spaces, 4 spaces, or a tab), and run it. Valid JSON comes back pretty-printed instantly — free, no signup, and everything stays in your browser.

What is the best free JSON beautifier?

The best beautifier validates before it formats, so you get a clear error instead of a silent mess. This tool checks your JSON with the standard parser first, then pretty-prints it with your chosen indentation — free with no signup.

How can I validate JSON without an account?

Use the JSON validator above: paste your JSON and run it. If it parses, you get "Valid JSON" plus the pretty-printed output; if not, you get the parser's exact error message pointing at the problem.

How do I pretty print JSON with tabs instead of spaces?

Select "Tab" in the "Indentation" dropdown before running the tool. The formatter will indent every level with one tab character, which is handy for editors configured for tab indentation.

Can I minify JSON with this formatter?

This tool is a pretty-printer, not a minifier: it expands JSON with your chosen indentation for readability. For minified output, paste compact JSON into the box — if it is already valid and you do not need the formatting, the validator still confirms it parses.

Is my JSON uploaded anywhere when I format it?

No. Parsing and formatting run entirely in your browser with a vendored open-source library — your JSON is never sent to a server, stored, or used for anything else.

JSON Formatter — Beautify & Validate JSON Online

What is Json formatter?

JSON Formatter — Free JSON formatter: beautify and validate JSON online — pretty-print with 2-space, 4-space or tab indent, plus clear error messages on invalid JSON.

Validity is established with the JSON parser (JSON.parse): anything it rejects is reported as invalid with the parser's own message. Valid JSON is then pretty-printed by the js-beautify open-source formatter (vendored), which normalizes indentation to your choice of 2 spaces, 4 spaces, or a tab. Everything runs client-side; no AI is involved.

Why use this json formatter?

🎯

Built for json formatter

Free JSON formatter: beautify and validate JSON online — pretty-print with 2-space, 4-space or tab indent, plus clear error messages on invalid JSON.

📋

Transparent & honest

Validation uses the standard JSON grammar — single-quoted strings, trailing commas, comments, and unquoted keys are invalid JSON and will be rejected.

🔒

Private by design

Everything runs in your browser. Your inputs never leave your device.

📱

Works everywhere

Fully responsive — perfect on desktop, tablet, and mobile. No app needed.

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Regularly updated

Regularly maintained and reviewed to ensure accuracy.

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Free forever

No accounts, no limits, no watermarks. Use JSON Formatter as much as you need.

How to use JSON Formatter

1Paste your JSON into the "JSON code" box.
2Choose your "Indentation": 2 spaces, 4 spaces, or a tab.
3Run the tool — valid JSON comes back pretty-printed with your chosen indentation.
4If the JSON is invalid, you get the parser's exact error message so you can find the mistake.
5Copy the formatted result back into your editor, config file, or API console.

What can you do with JSON Formatter?

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Minify json — Free JSON formatter: beautify and validate JSON online — pretty-print with 2-space, 4-space or tab indent, plus clear error messages on invalid JSON.

Good to know

Validation uses the standard JSON grammar — single-quoted strings, trailing commas, comments, and unquoted keys are invalid JSON and will be rejected.
Key order is preserved as written; duplicate keys keep their last value per the parser's behavior.
Numbers beyond the safe integer range may lose precision when parsed — this is standard JSON behavior, not a tool bug.

How it works

Validity is established with the JSON parser (JSON.parse): anything it rejects is reported as invalid with the parser's own message. Valid JSON is then pretty-printed by the js-beautify open-source formatter (vendored), which normalizes indentation to your choice of 2 spaces, 4 spaces, or a tab. Everything runs client-side; no AI is involved.

Examples

Compact object, 2-space indent

Status: ok — Valid JSON, pretty-printed with 2-space indentation.

Minified array, tab indent

Status: ok — Valid JSON, each object on its own tab-indented line.

Invalid JSON gets the parser message

Status: error — invalid JSON reported with the parser's exact message.

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