JSON Editor Online — Free Browser-based Workspace

A powerful, local-first JSON editor. View, edit, format, and validate your JSON data securely in your browser. Switch seamlessly between text, tree, and table views.

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How to edit JSON online

  1. Open the editor and paste your JSON (Cmd/Ctrl + V), open a file, or drop a .json file anywhere on the page.
  2. Switch between Text, Tree, and Table views to interact with your data.
  3. In Tree view, right-click to add, duplicate, or delete nodes. In Text view, write freely with syntax highlighting.
  4. Changes are instantly synced across all views and auto-saved locally.

Secure & Local

Your data never leaves your device. All processing happens in your browser.

Three Views

Edit in standard text, explore in a collapsible tree, or view arrays as tables.

Auto-repair

Automatically fix common JSON syntax errors like trailing commas or single quotes.

Multi-column

Open multiple panels to view the same document in different ways simultaneously.

Frequently Asked Questions

Is this JSON Editor free?

Yes, JSON OS is completely free. There are no paywalls, no signup requirements, and no premium features.

Is my JSON data secure?

Yes. The editor operates locally in your browser using a Web Worker. Your JSON data is never uploaded to any server, making it safe for sensitive information.

Can I edit JSON in a tree view?

Yes, our editor features a robust tree view that lets you inline rename keys, edit values, duplicate nodes, and convert data types seamlessly.