Online JSON Editor with Validation

Edit JSON with formatting and validation support.

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How to use

Paste or type your input in the left editor
Adjust options in the toolbar if available
Copy or download the output from the right pane

This free online tool runs entirely in your browser. No sign‑up, no server uploads.

About JSON Editor

Edit JSON with formatting and validation support.

The JSON editor maintains a synchronized dual-view architecture: a text editor with syntax highlighting and a tree editor with inline editing controls. Changes in either view are immediately reflected in the other through a shared data model. The text editor uses a code-editing component with bracket matching, auto-closing, and real-time linting, while the tree view provides point-and-click editing with type-aware input controls.

Use the left editor to enter your data. The output updates in real time. You can copy, clear, download, or expand either pane.

Tip: Use the search bar to quickly switch between tools.

Sample JSON

{
  "name": "Jane",
  "age": 29,
  "skills": ["js","html","css"]
}

Example input shown above. Output appears in the right pane instantly.

Why this tool?

Feature	JSON Editor	Typical alternatives
Free online tool	Yes	Often yes
Client‑side only (privacy)	Yes	Varies
No sign‑up required	Yes	Varies

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FAQs

Can I edit JSON keys and values directly in a tree view?

Yes. The JSON editor provides both a raw text mode and a structured tree mode where you can click on any key or value to edit it inline. You can also add, delete, and reorder properties without manually editing brackets and commas.

Does the editor validate JSON as I type?

The editor performs real-time syntax validation and highlights errors inline as you edit. Missing commas, mismatched brackets, and invalid values are flagged immediately so you can correct them before saving or copying the output.

Can I change value types in the JSON editor?

You can change a value's type — for example, converting a string to a number, a boolean, or null — directly in the tree editor. The editor ensures the resulting JSON remains valid after every type conversion.

Does the editor support undo and redo?

Yes. Full undo and redo history is available with standard keyboard shortcuts (Ctrl+Z / Ctrl+Y). Every edit — whether in text mode or tree mode — is recorded so you can step backward and forward through your changes.

Can I use the editor to fix broken JSON?

The editor highlights the exact location of syntax errors and provides descriptive error messages, making it straightforward to identify and fix issues like missing quotes, extra commas, or unclosed brackets in malformed JSON.