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Home Developer ToolsJSON Formatter

{ }⚡ Developer Tools

JSON Formatter

Format, validate and minify JSON payloads.

Enter JSON to start.

Paste JSON into the field below to begin.

Input JSON

What's next?

⏱️Cron Expression Parser 📁.gitignore Generator 🧾CSV ↔ JSON Converter

Free Online JSON Formatter & Validator

Format, validate, and minify JSON entirely in your browser — no upload to any server and no account required. Paste messy JSON and get clean, readable output in one click.

Back-end developers format API responses to debug unexpected data shapes. Front-end developers minify JSON config files before bundling. QA engineers validate JSON payloads from test suites to ensure structural correctness.

How to Use

1Paste your JSON into the input area.
2Click Format to pretty-print, Minify to compress, or Validate to check for errors.
3Copy the result with the Copy button.

Frequently Asked Questions

Is my JSON sent to a server?

No. All processing happens in your browser using JavaScript's built-in JSON.parse and JSON.stringify.

What causes a JSON validation error?

Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or comments — none of which are valid JSON.

What indent size is used?

Two spaces by default, which is the most widely adopted convention.

Can I format very large JSON files?

Yes, but files over 1 MB may be slow due to browser memory constraints. Consider splitting large files first.

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