{ } JSON Tool

Free JSON Formatter & Validator

Format, validate, minify, sort, diff, search and convert JSON — all advanced features, free, 100% in your browser.

Paste or type JSON to get started
📥 Input JSON
📤 Output
{ } Output will appear here after you format or validate
📊 JSON Statistics
Total Keys—
Objects—
Arrays—
Strings—
Numbers—
Booleans—
Nulls—
Max Depth—
Raw Size—
Minified Size—
⚙️ Format Options
Sort Keys A→ZAlphabetical order
Syntax HighlightColor-code output
Line NumbersShow line count
Auto FormatFormat as you type
Compact ArraysArrays on one line
🔍 Search in JSON
🔄 Convert

Free JSON Formatter & Validator — The Most Advanced Tool Online

Our free JSON formatter is the most complete and advanced online tool to format, validate, minify, sort, search, diff, and convert JSON data. Simply paste your raw, minified, or malformed JSON and instantly get a beautifully formatted, syntax-highlighted output with real-time error detection. All processing happens entirely in your browser — 100% private, no signup, no ads, forever free.

JSON (JavaScript Object Notation) is the standard data format used by virtually every modern API, web service, and application. Whether you are a backend developer debugging an API response, a frontend engineer working with REST data, a data analyst processing JSON exports, or a student learning the structure of JSON — our tool handles every use case from basic formatting to advanced operations like JSON-to-CSV conversion, key sorting, duplicate removal, escape/unescape, tree view exploration, and live diff comparison between two JSON files.

Unlike other online JSON tools that only offer basic formatting, SnapCode's JSON formatter and validator provides a complete JSON workbench with a side panel for live statistics, conversion options, a search engine to find keys and values, and toggle options to customize your output exactly the way you need it.

How to Use the JSON Formatter

1
Paste, Upload or Load Sample JSON

Paste your raw JSON directly into the input panel on the left, click "Upload" to load a .json file from your device, or click "Sample" to instantly load a rich example JSON with nested objects, arrays and multiple data types.

2
Format & Validate Instantly

Click "Format" to beautify your JSON with proper indentation and color-coded syntax highlighting. The status bar turns green for valid JSON or red with the exact error message and position for invalid JSON — so you can fix issues in seconds.

3
Explore with Interactive Tree View

Click "Tree View" to open an interactive collapsible tree explorer of your entire JSON structure. Expand and collapse objects and arrays, see item counts, and navigate deeply nested data with ease. Perfect for large complex API responses.

4
Use Advanced Features

Sort keys alphabetically, remove duplicate keys, escape or unescape JSON strings, minify for production, compare two JSON files with the built-in Diff tool, convert to CSV/XML/YAML, flatten deeply nested JSON to dot notation, or unflatten it back.

5
Copy or Download the Result

Click "Copy" to copy the formatted output to your clipboard, or "Download" to save it as a .json, .csv, or .xml file — ready to use in your project, spreadsheet, or documentation.

Key Features & Benefits

✨Syntax Highlighting

Keys, strings, numbers, booleans and nulls are color-coded for maximum readability — just like a professional code editor.

✔️Real-time Validation

Instantly detects JSON errors with the exact line number and character position — no more guessing where the missing comma or bracket is.

🌳Interactive Tree View

Explore any JSON structure in a fully collapsible tree — see object sizes, array lengths, and navigate nested data visually.

⚡JSON Diff Comparison

Paste two JSON files and instantly see exactly what was added, removed, or changed — color-coded with path information.

📊Convert to CSV, XML & YAML

Export your JSON to CSV for Excel/Sheets, XML for legacy systems, or YAML for configuration files — all in one click.

↕Sort Keys Alphabetically

Reorder all keys in your JSON alphabetically — great for standardizing API responses and making comparisons easier.

🔩Flatten & Unflatten

Convert deeply nested JSON to a flat key-value format using dot notation, or reverse the operation to restore nested structure.

🔍Search Keys & Values

Search for any key name or value inside your JSON instantly — results show the full path so you know exactly where to find it.

🔒100% Private & Free

All operations happen locally in your browser. No JSON data is ever transmitted to any server. Completely private and free forever.

What is JSON and Why Do Developers Use It?

JSON stands for JavaScript Object Notation. It is a lightweight, text-based data format that is easy for both humans and machines to read and write. JSON was derived from JavaScript but is completely language-independent and is now the de facto standard for data exchange on the web.

JSON is used everywhere — REST APIs return JSON responses, configuration files like package.json and tsconfig.json use JSON, databases like MongoDB store JSON documents, and web applications send JSON between the browser and server. Almost every modern developer works with JSON on a daily basis.

When working with real-world JSON data — especially minified API responses — the raw text is extremely difficult to read. A JSON formatter adds proper indentation and line breaks to make the structure immediately visible. A JSON validator ensures the data follows correct JSON syntax before you try to parse it in your application, saving time debugging mysterious parse errors.

Our tool goes beyond basic formatting. The JSON tree view is especially useful for large, deeply nested responses from GraphQL or REST APIs where you need to understand the overall structure at a glance. The JSON diff tool is invaluable for comparing API responses between environments (development vs production) or between different versions of a schema. The JSON statistics panel gives you instant insight into the complexity of your data — total keys, max nesting depth, number of arrays, strings, and even the difference in size between the raw and minified versions.

Frequently Asked Questions
JSON formatting (also called beautifying or pretty-printing) adds proper indentation and line breaks to minified or compact JSON, making it easy for humans to read and debug. Raw minified JSON from APIs is nearly unreadable as a single long line. Our formatter transforms it into a clean, structured, color-coded output in one click.
JSON validation checks whether your data follows correct JSON syntax — proper use of double quotes around keys and string values, correct use of commas between items, matching brackets and braces, no trailing commas, and valid data types. Our validator shows the exact line number and character position of any error so you can fix it immediately.
Minification removes all unnecessary whitespace, indentation, and newlines from JSON to produce the smallest possible output. This is important for production APIs and web apps where every byte of bandwidth matters, especially for mobile users or high-traffic endpoints. Use Minify before embedding JSON in your code or sending it over a network.
If your JSON is an array of objects with consistent keys, our converter uses the first object's keys as the CSV header row, then outputs each object as a comma-separated row below it. String values containing commas are automatically wrapped in quotes. The resulting CSV can be opened directly in Microsoft Excel, Google Sheets, or any spreadsheet application.
Flattening converts a nested JSON object into a single-level key-value object using dot notation. For example, {"address":{"city":"London"}} becomes {"address.city":"London"}. This is useful when working with systems that do not support nested data, or when you need to map JSON fields to flat database columns. Unflattening does the reverse operation.
The Diff tool compares two JSON objects and highlights every difference — keys that were added, keys that were removed, and values that were changed. Each difference shows the full dot-notation path so you know exactly where in the structure the change occurred. This is ideal for comparing API responses, tracking schema changes, or debugging environment-specific configuration differences.
Yes — completely safe. All JSON processing happens 100% in your browser using JavaScript. No data, not even a single character of your JSON, is ever sent to any server. We do not log, store, or transmit your data in any way. This makes our tool safe for use with sensitive internal data, API keys, and private configuration files.
Yes — since all processing happens in your browser, you can format large JSON files without any upload limits. Performance depends on your device's memory and CPU. For very large files (several MB), we recommend using the Upload button rather than pasting, as it handles large files more efficiently. The Minified Size stat in the side panel helps you gauge the actual data size.