Developer Tools • 100% Client-Side

JSON Formatter

Format, validate, beautify, and minify JSON data online with instant syntax error detection. Indent nested objects with customizable spacing, collapsable trees, and one-click copy.

Format, validate, beautify, and minify JSON data online with instant syntax error detection. Indent nested objects with customizable spacing, collapsable trees, and one-click copy.

JSON Input

How to Format & Validate JSON Online

  1. Paste your unformatted, minified, or raw JSON code into the editor above.
  2. Click Format to beautify your data with 2-space indentation and syntax validation.
  3. Click Minify if you want to compact the JSON and strip whitespace for network payloads.
  4. Use the Copy button to immediately paste formatted JSON into your IDE or API client.

Features & Capabilities

  • Syntax Error Detection: Pinpoints missing brackets, unescaped quotes, or trailing commas.
  • 100% Client-Side Privacy: Your JSON data is evaluated entirely in your browser; never sent over the wire.
  • Large Document Support: Effortlessly formats large JSON payloads, API responses, and database dumps.
  • One-Click Minification: Instantly compress payload sizes for production performance.

Frequently Asked Questions

Yes. All JSON formatting, minification, and validation are performed locally inside your browser's JavaScript runtime. We do not transmit, log, or store any data on our servers.

APIs often return minified JSON without line breaks to conserve bandwidth. Formatting introduces indentation and hierarchy, allowing developers to inspect data structures, verify schema types, and identify parsing errors quickly.

If the JSON has invalid syntax (like single quotes instead of double quotes, or trailing commas), the validator displays a red error notice highlighting where the parser failed so you can correct it.

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