JSON Tools
Format, Validate, Compare & Transform

Pretty Print is a multi-format code formatter supporting JSON, XML, SQL, YAML, CSS, and HTML. JSON Tools is a specialized JSON-only toolkit that adds powerful features: validation with detailed error messages, semantic object comparison (diff), interactive tree view with JSONPath discovery, and format conversion to YAML, CSV, TypeScript interfaces, and XML. If you're working specifically with JSON, JSON Tools provides a much richer experience.

The compare feature performs a semantic comparison of JSON structures, not a simple line-by-line text diff. This means it correctly identifies added, removed, and changed values even if the key order is different. You can also enable "Ignore key order" to compare only the values regardless of how keys are arranged. The diff output highlights additions in green, removals in red, and changes in amber with both old and new values shown.

JSONPath is a query language for JSON, similar to XPath for XML. It provides a way to reference specific values in a JSON document. In the Tree View, click any value to see its JSONPath (e.g., $.users[0].name). You can use this path in JavaScript with libraries like jsonpath, or in many programming languages and tools that support JSONPath queries.

Currently you can convert JSON to: YAML (great for Kubernetes configs, Docker Compose, CI/CD pipelines), CSV (for arrays of objects - perfect for spreadsheet analysis), TypeScript interfaces (automatically generates type definitions for your JSON structure), and XML (for legacy system integration). All conversions happen entirely in your browser.

Yes! The tool handles JSON files up to several megabytes efficiently. For very large files, the comparison may take a few seconds. The Tree View can also handle large JSON structures with smooth scrolling and search functionality. For extremely large files (10MB+), consider using the minify feature first to reduce size, or splitting the JSON into smaller chunks.

No. All processing happens entirely in your browser using JavaScript. Your JSON data never leaves your device - there are no server calls, no analytics on your content, and no data storage. The tool works completely offline after the page loads. This makes it safe to use with sensitive data like API keys, configuration files, or personal information.

The most common JSON errors are: trailing commas (remove the comma after the last item in arrays/objects), single quotes (JSON requires double quotes), unquoted keys (all keys must be in double quotes), and missing commas between elements. The Validate tab shows the exact line and column where errors occur, making them easy to locate and fix. For more complex formatting issues, try our Pretty Print tool which handles multiple formats.

Yes! The Convert tab lets you transform JSON arrays into CSV files that open directly in Excel, Google Sheets, or any spreadsheet application. This is perfect for analyzing API response data, log files, or database exports. For encoding data for transmission, check out our Base64 Encoder. If you need to generate test data with unique identifiers, our UUID Generator creates RFC-compliant UUIDs.

The TypeScript converter analyzes your JSON structure and generates type-safe interfaces. It infers types from values (string, number, boolean, null), creates nested interfaces for objects, and properly types arrays. For example, an array of objects becomes UserItem[] with a corresponding interface UserItem. This saves significant time when working with API responses in TypeScript projects.

Use the Tree View tab for navigating complex nested structures. The tree shows objects and arrays with expand/collapse controls, displays the number of keys or items at each level, and lets you search for specific keys or values. Click any value to see its JSONPath, which you can copy and use in your code. The "Expand All" and "Collapse All" buttons help you quickly overview the structure or drill into specific sections.

Absolutely! JSON Tools works great alongside other RJL.io tools. Use the Pretty Print tool for formatting XML, SQL, or CSS alongside your JSON. Generate QR codes containing JSON data for quick sharing, or use the QR Scanner to read JSON from QR codes. For barcode data, check our Barcode Generator. All tools are free, work offline, and respect your privacy.