JSON Formatter & Validator

Format, minify, and validate JSON data with syntax highlighting and interactive tree view.

What is a JSON Formatter?

A JSON formatter (also called a JSON beautifier or JSON pretty printer) is a tool that takes raw, compact JSON data and reformats it with proper indentation, line breaks, and spacing to make it human-readable. JSON (JavaScript Object Notation) is the most widely used data interchange format in web development, APIs, and configuration files.

This tool also validates your JSON as you type, catching syntax errors like missing commas, unclosed brackets, or invalid values before they cause problems in your application.

How to Use This JSON Formatter

Paste your JSON — Copy your raw JSON data and paste it into the input editor on the left.

Click Format — The tool instantly pretty-prints your JSON with proper indentation and syntax highlighting.

Switch views — Toggle between formatted text view and interactive tree view to explore nested structures.

Minify if needed — Click "Minify" to compress your JSON by removing all whitespace, useful for reducing payload size.

Copy the result — Use the copy button to copy the formatted or minified output to your clipboard.

Common Use Cases

Debugging API responses — Format JSON returned by REST APIs to quickly inspect the data structure and find specific values.

Validating configuration files — Check that JSON config files (package.json, tsconfig.json, etc.) are syntactically correct before deploying.

Minifying for production — Compress JSON payloads to reduce bandwidth and improve API response times.

Exploring nested data — Use the tree view to navigate deeply nested JSON structures without losing track of hierarchy.

Frequently Asked Questions

How do I format JSON online?

Paste your JSON into the input editor and click "Format". The tool will automatically pretty-print your JSON with proper indentation and syntax highlighting. You can also use the tree view to explore nested structures.

How do I validate JSON online?

Paste your JSON into the editor and the tool will instantly validate it. If there are syntax errors, the exact line and character position will be highlighted so you can quickly fix the issue.

What is JSON pretty print?

JSON pretty print (or beautify) reformats compact JSON into a human-readable format with proper indentation, line breaks, and spacing. This makes it much easier to read and debug JSON data structures.

Can I minify JSON with this tool?

Yes. Click the "Minify" button to remove all whitespace and formatting from your JSON, producing the most compact representation. This is useful for reducing payload size in API responses and configuration files.