Free Online JSON Editor - Tree View, Format & Validate

A Paste your JSON into the text area and click the Format button. It will add proper indentation and line breaks for readability.

A The tree view provides a visual representation of your JSON structure. You can expand/collapse nodes and view all key-value pairs.

A Any valid JSON is supported including objects, arrays, nested structures, strings, numbers, booleans, and null values.

A Minifying your JSON files significantly improves the performance of web applications by reducing their file size. Our online JSON editor achieves this by removing unnecessary whitespace, line breaks, and comments, resulting in a more compact data structure. This leads to faster loading times for your users, lower bandwidth consumption, and quicker API responses, making your application more efficient and responsive across different devices and network conditions.

A No, absolutely not. Our online JSON editor is designed with your privacy in mind. All JSON processing, including parsing, editing, formatting, and minification, occurs entirely within your browser. Your data is never transmitted to or stored on our servers. Once you close or refresh the browser tab, your JSON data is completely cleared, ensuring maximum confidentiality for your sensitive information.

A If you paste invalid JSON, our online editor immediately detects syntax errors. It highlights the problematic lines and provides clear error messages, often indicating the exact location (line number and character position) where the issue occurred. This real-time feedback helps you quickly identify and correct mistakes, ensuring your JSON structure is valid before you export or use it further, saving valuable debugging time.

A Yes, it works completely offline after the page loads. All processing happens in your browser using JavaScript — no data ever leaves your machine. You can disconnect your internet and still format, minify, or edit JSON without interruption. This makes it perfect for working with sensitive data on a plane or in a secure environment. Just load the page once, then you're good to go.

A Yes, right-click any value in the tree view and select "Copy Value". This copies just the string, number, or boolean to your clipboard. No need to manually select text or risk grabbing the wrong bracket. Handy when you're pulling a specific API key or configuration setting from a large JSON file.