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JSON Editor

Edit JSON with live validation, formatting and error checks.

JSON ToolsBrowser-only • PrivateFree

Indent

Edit JSON

Formatted & Validated

Output will appear here...

Privacy First: All processing happens locally in your browser. Your data never leaves your device and is never uploaded to any server.

About JSON Editor

The JSON Editor lets you write and edit JSON with live validation, so mistakes surface the moment you type them instead of at runtime. It combines editing, one-click formatting, and instant error feedback in a single view — handy for hand-tweaking config files, fixtures, and API bodies. All editing is local to your browser and nothing is uploaded. When you're done, format the result with the JSON Formatter or compare versions with the JSON Diff.

How to Use

1Open JSON Editor and paste or type your data into the input area.
2Adjust any available options to match the result you want.
3Your output is generated instantly — no button-clicking required for most tools.
4Use the Copy or Download button to save your result.

Common Use Cases

Debugging API responses while building web and mobile apps
Cleaning up minified or messy JSON from logs and network tabs
Preparing configuration files and fixtures for testing
Converting data between JSON and other formats for imports/exports

Frequently Asked Questions

Does the editor validate as I type?

Yes. Validation runs live, so an unbalanced bracket, trailing comma, or bad quote is flagged immediately with its location instead of only when you try to use the JSON.

Can I reformat while editing?

Yes. You can beautify the document with proper indentation at any point without leaving the editor, then keep editing the clean version.

Is JSON Editor free to use?

Yes. JSON Editor is completely free with no sign-up, no subscription, and no usage limits. Every tool on CodeUtilityKit is free forever.

Is my data safe when I use JSON Editor?

Absolutely. JSON Editor runs entirely in your browser. Your input is processed locally with JavaScript and is never sent to, stored on, or logged by any server — so it is safe even for private or sensitive data.