Online JSON Editor - Edit, Format & Validate JSON

JSON Editor

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JSON Editor for JSON and NDJSON

Edit JSON online in a browser-based Monaco editor with syntax highlighting, validation, and one-click formatting. Open JSON or NDJSON files, inspect errors as you work, and keep your data in the browser.

Key Features

Powerful Monaco editor engine with syntax highlighting
Real-time JSON syntax validation and error reporting
One-click JSON formatting
Support for large JSON and NDJSON files
Advanced search and replace with Regex support
JSON editing runs in your browser

Privacy & Security

The JSON Editor for JSON and NDJSON processes the data you paste or open in your browser. Shared links can contain that data in the URL, so check the link before sending it to someone else.

Large Dataset Support

Processing time and available file size depend on the input and your browser's memory and processing capacity.

Frequently Asked Questions

Does the JSON editor validate my data?

The editor checks JSON syntax and reports parse errors while you work. Use the Validator when you also need to check data against a JSON Schema.

Can I edit NDJSON files?

Yes. You can open JSON or newline-delimited JSON files in the editor and keep NDJSON records line-delimited when formatting them.

How do I format my JSON?

You can use the built-in 'Format' button to instantly prettify your JSON with proper indentation and spacing.