Free JSON Editor

How to Edit JSON Online

Paste your JSON into the editor panel on the left. A tree preview appears on the right, updating in real-time as you type. The validation indicator below the editor tells you whether your JSON is valid. Use the Format button to pretty-print with your preferred indentation, or Minify to strip all whitespace. You can also drag and drop a .json file or use the upload button.

When to Use a JSON Editor

A JSON editor is useful for creating or modifying API request bodies, editing configuration files, preparing test data, cleaning up JSON exports, or quickly formatting JSON for documentation. The tree preview helps you verify the structure is correct before using the JSON in your application.

Frequently Asked Questions

What does the JSON Editor do?

The JSON Editor provides a text editor with real-time validation and a tree preview panel. As you type, the tree updates to show the structure of your JSON. You can also format (pretty-print) or minify your JSON with one click.

Does it validate my JSON?

Yes — the editor validates your JSON in real-time as you type. A green checkmark indicates valid JSON, while a red X shows the error message with details about what went wrong.

Is this editor free?

Yes — completely free, forever. No sign-up, no account, no usage limits.

Is my data safe?

All editing and validation happens locally in your browser using JavaScript. Your JSON is never uploaded to any server. It's safe to use with sensitive or proprietary data.

Can I format and minify?

Yes — use the Format button to pretty-print with your choice of indentation (2 spaces, 4 spaces, or tabs), or the Minify button to remove all whitespace.

Can I also view JSON as a tree?

For a dedicated tree view with copy-path support, use the JSON Viewer.