JSON Formatter & Minifier — Prettify & Validate JSON

Client-Side Developer Suite

Essential Developer Utilities

Fast, secure, 100% browser-based tools for formatting JSON, encoding URLs, Base64 conversion, HTML entities, and UUID generation.

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JSON Formatter

Prettify and format JSON data with syntax validation

100% Client-Side Only

Indentation: 2 Spaces 4 Spaces Tab

Input

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Result / Output

Client-Side Guarantee: Your files and data are processed locally in your browser and are never uploaded or stored on any server.

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USAGE GUIDE

How to Format & Validate JSON

Validate, clean, and format raw JSON data in seconds.

Paste or Upload JSON

Paste raw JSON or upload a .json file directly into the input area.

Select Options

Choose 2 spaces, 4 spaces, or tab indentation. Check for syntax error highlights.

Copy or Download

Copy the validated formatted result to clipboard or download as a .json file.

FAQ

JSON Formatter FAQ

How does the online JSON formatter validate syntax?

The tool utilizes your browser's native JSON parser to check for standard ECMA-404 compliance. If the input has errors like trailing commas, single quotes instead of double quotes, or missing brackets, the exact error location and description are highlighted.

Can I choose different indentation levels?

Yes. You can format your JSON using 2 spaces (default standard for web APIs), 4 spaces, or tab indentation.

Is my JSON data kept private?

Yes. All validation, formatting, and minification happen locally in your web browser. No JSON payloads, credentials, or keys are transmitted to any server.