What is JSON Viewer/Editor?

JSON Viewer/Editor provides an interactive tree view for exploring and editing JSON data. Collapse and expand nested objects, edit values in place, add or remove keys, and search within the structure. It works well for complex API responses and configuration files.

The tree view collapses each branch independently, so you can drill down into a 5,000-line API response without losing your place. Clicking any value drops you into an inline editor that respects the original type (string, number, boolean, null). Search by path to jump to a node like settings.database.timeout, or switch to value search to find a node by its content — an email, an id, a status code.

How to use

1. Step 1 — Paste JSON data or upload a .json file to load it into the interactive tree view with collapsible nodes.
2. Step 2 — Click any value to edit it inline, use the toolbar to add new keys/items, delete entries, or search for specific paths within the tree.
3. Step 3 — Switch between tree view and raw text mode. When you're done, copy the result or download it as JSON, YAML, CSV, or XML.

When to use

• Hunting for a single misconfigured field inside a long Kubernetes config or API response.
• Cleaning up dump files before committing them to git or pasting into a bug report.
• Teaching JSON structure to someone new — the tree view shows nesting at a glance.

Result

You receive a deeply nested 200-line API config and need to change a single setting buried 5 levels deep. Load it in the tree view, use search to find 'timeout', click the value to change it from 30 to 60, and download the updated JSON.

FAQ

How big a JSON file can the editor handle without freezing?

Files under 5 MB render smoothly. Larger files (around 20 MB) work but the tree expansion may pause for a second on the initial render. For anything past 50 MB, use a streaming parser or split the file first.

Does editing a value change the type, or is everything stored as a string?

The editor keeps the original type. Editing the number 30 to 60 leaves it as a number. To change a number into a string, switch to text mode and add quotes manually, then return to tree view.

Why does my edit show an error when I switch back to tree mode?

Text mode lets you type freely, so you can introduce syntax errors (unquoted keys, trailing commas, single quotes, mismatched braces). The tree view refuses to render until the JSON parses cleanly. Click Repair to auto-fix the common mistakes, or fix the parse error shown below the textarea by hand and try again.

Can I add a new key to an object that already has children?

Yes. Expand the parent object, click the Add Key button on its row, type the key name, and pick a value type (string, number, object, array, etc.). The new entry appears at the end of the object.

Is my data sent anywhere when I paste it in?

Pasted, typed, and uploaded data all stay on your device — nothing is uploaded anywhere. The only outbound request happens when you use Load from URL, and that request goes straight from your device to the address you typed in. Sensitive config files and auth tokens never pass through our servers.

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