JSON Formatter, Validator & Converter

Free Online JSON Formatter, Validator & Converter - Clean, Repair & Transform JSON Data

JSON (JavaScript Object Notation) is the standard lightweight data-interchange format used by modern REST APIs, web applications, databases, and microservices. Unformatted JSON strings from server responses, log files, or database exports often appear as raw single-line blobs that are nearly impossible to read or debug. Our Free Online JSON Formatter & Validator formats, indents, validates, and repairs your JSON data instantly.

Equipped with an interactive collapsible tree view, automatic syntax error auto-fix repair, JSON-to-CSV/XML/YAML converters, and file import/export capabilities, our tool provides a full suite of data utilities for backend software engineers, data analysts, and API developers. Everything executes 100% locally in your web browser, ensuring complete privacy for sensitive API tokens, user data, and database records.

How to Format, Validate & Convert JSON Data

1. Paste or Import JSON Data: Paste raw unformatted JSON text into the left input panel, or click "Import .json File" to load JSON files from your computer.
2. Validate & Prettify: View instant syntax validation. If your JSON contains trailing commas, single quotes, or missing property quotes, click "Auto-Fix Syntax" to automatically repair it into valid JSON.
3. Explore Interactive Tree View: Switch between Code Editor view and Collapsible Tree View to expand or collapse nested objects and arrays.
4. Convert & Export: Select output conversion format (JSON, CSV, XML, or YAML), copy formatted code with 1-click, or download the formatted `.json` file.

Key Features & Technical Capabilities

• Interactive Collapsible Tree View: Browse deep nested JSON objects with collapsible node trees, search keys, and node depth counts.
• Auto-Fix Syntax Error Repair: Automatically repairs common JSON errors including single quotes (`'key': 'value'`), unquoted keys (`name: "John"`), and trailing commas (`[1, 2, 3,]`).
• Multi-Format Converter (JSON to CSV, XML, YAML): Convert JSON array objects into downloadable CSV spreadsheet tables, XML documents, or YAML configuration files with 1 click.
• 100% Client-Side Privacy: API payload data, environment configurations, and database JSON records remain completely local inside your browser.

Best Practices for Working with JSON Data

• Use Double Quotes for Keys and Strings: The JSON specification (RFC 8259) strictly requires double quotes (`"key": "value"`). Single quotes are invalid JSON syntax.
• Remove Trailing Commas: Trailing commas in arrays [1, 2,] or objects {"a": 1,} cause parse errors in standard JSON parsers like JSON.parse().
• Minify for Production API Payloads: Use minification to strip whitespace and linebreaks before transmitting JSON payloads over HTTP to reduce network bandwidth.

Frequently Asked Questions (FAQ)