Everything you need to know about JSON formatting and validation.
What is JSON and why format it? ▼
JSON (JavaScript Object Notation) is a lightweight data interchange format. Raw or minified JSON is hard to read — formatting adds proper indentation and line breaks to make it human-readable. It's used in APIs, config files, databases, and data storage everywhere.
Is my JSON data sent to a server? ▼
No. All JSON processing happens 100% in your browser using JavaScript. Your data never leaves your device and is never uploaded to any server. This makes it safe to use with sensitive, proprietary, or confidential JSON data.
How do I convert JSON to CSV? ▼
Paste your JSON array of objects, click Format, then switch to the CSV tab. The first object's keys become the CSV headers, and each object becomes a row. Download the CSV to import into Excel, Google Sheets, or data analysis tools.
What is the Tree View? ▼
Tree View displays JSON as an interactive collapsible tree. Click the ▶ arrow next to any object or array to expand or collapse it. Hover over a key to see its full JSON path (like user.settings.theme). This helps navigate complex nested JSON structures quickly.
What does Sort Keys do? ▼
Sort Keys alphabetically reorders all object properties at every level of nesting. This makes it easier to compare two JSON objects, find specific keys quickly, and maintain consistent key ordering across JSON files in a project.
What JSON validation errors will it detect? ▼
The validator detects all standard JSON syntax errors including: trailing commas, missing commas between items, unquoted keys, single-quoted strings (JSON requires double quotes), incorrect bracket matching, and invalid special characters. The exact error position is shown in the error message.
Can I upload a large .json file? ▼
Yes. Click the Upload JSON button to select a .json file from your device. The file is processed entirely in your browser — there's no size limit enforced by the tool, though very large files (over 10MB) may be slow depending on your device's memory.