Online JSON Editor with Validation
This free online JSON editor combines a powerful code editor with real-time JSON validation. As you type, the editor automatically checks your JSON syntax and highlights any errors with precise line numbers and descriptions. Unlike a simple JSON formatter, the editor supports full editing workflows — create new JSON from scratch, open existing files, edit content, and save back to your device.
The undo/redo system keeps a full history of your edits so you can safely experiment with changes. Switch to Tree view to explore the current JSON structure visually as you write. Need to format or validate without editing? Use the JSON Formatter & Validator.