JSON Formatter & Minifier

Format, compress, and validate JSON data

This tool formats (pretty print), minifies (compress), and validates JSON data. All processing is done in your browser, and no data is transmitted to servers. Perfect for API development, config file editing, and debugging tasks.

How to Use

Format, minify, and validate JSON in 3 simple steps:

Input JSON Data
Paste your JSON data into the left text area. You can input API responses, configuration files, or any JSON string.
Select Operation
Click 'Format' button for pretty printing, 'Minify' button to reduce file size, or 'Validate' button to check syntax.
View & Copy Result
The result appears on the right side. Use the copy button to copy the result to clipboard. Size reduction percentage is shown when minifying.

🔒 Privacy Protected: All processing is done in your browser, no data is sent to external servers.

JSON Formatter & Minifier

Input JSON Data

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Result

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Use Cases

JSON Formatter & Minifier is useful in various development scenarios:

1. API Development & Debugging

Format REST API responses to understand their structure. Useful for analyzing error responses and validating data structures. Paste JSON from cURL commands or Postman directly for easy reading.

2. Configuration File Editing

Format and validate configuration files like package.json, tsconfig.json, .eslintrc.json. Format minified JSON for easier editing, or validate syntax after editing.

3. Data Compression & Optimization

Minify JSON files for production to reduce file size. Helps reduce CDN bandwidth and web application bundle sizes. Real-time reduction percentage display.

4. Log File Analysis

Format JSON data in application logs and server logs. Expand minified single-line logs for easier reading and faster problem identification.

5. Data Validation & Testing

Validate JSON schema operations and data format. Check syntax before saving form input as JSON, verify API test data validity.

About JSON Formatting & Minification

JSON (JavaScript Object Notation) is a lightweight text format widely used for data exchange. JSON formatting, minification, and validation tools are essential for handling JSON data efficiently.

JSON Formatting (Pretty Print / Beautify)

Adds line breaks and indentation to minified JSON data, making it human-readable. Nested structures become visually clear, making data verification and editing easier. Particularly useful when reviewing API responses and editing configuration files.

JSON Minification

Removes unnecessary whitespace, line breaks, and indentation to compress JSON data to minimum size. The meaning and structure remain unchanged while file size is reduced. Effective for production deployment, reducing network transfer, and saving storage.

JSON Validation

Checks if JSON data follows correct syntax. Detects common errors like missing commas, bracket mismatches, and quote errors. Useful for pre-checking data before transmission and verifying configuration file operations.

Frequently Asked Questions

What's the difference between formatting and minifying JSON?

Formatting (Format) adds line breaks and indentation to make JSON readable. Minifying (Minify) does the opposite, removing all unnecessary whitespace to minimize file size. It's common to work with formatted versions during development and use minified versions for production deployment.

Is my input JSON data sent to servers?

No, all processing is done entirely in your browser, and data is never sent to external servers. You can safely use JSON data containing confidential information.

Can it handle large JSON files?

Yes, as long as your browser's memory allows, it can process large JSON files. However, for very large files (several MB or more), browser performance may slow down.

What kind of errors does JSON validation detect?

It detects syntax errors (bracket mismatches, missing commas), invalid escape sequences, unexpected tokens, and other violations of JSON specification. Error messages include hints about the problem location.

How much size reduction can I expect from minifying JSON?

Depending on the original JSON formatting, you can typically expect 20-40% size reduction. The more indentation and line breaks in the original, the greater the compression effect. Reduction percentage is automatically displayed after minification.

Does it correctly handle arrays and nested objects?

Yes, it correctly processes deeply nested arrays, objects, and mixed data structures. It supports all data structures that comply with JSON specification.

Can I change the indentation width for formatting?

The current tool uses 2-space indentation. This is the de facto standard for JSON formatting and the recommended setting in most development environments.

Can this tool be used with other JSON-related tools?

Yes, it can be used as preprocessing for JSON conversion tools (JSON-CSV conversion, JSON-XML conversion, etc.) for data validation and formatting. You can also copy results and paste them into other tools.