Online JSON Formatter, Validator & Beautifier
Format, validate, beautify, and inspect JSON payloads. Features real-time syntax error checking, collapsible tree navigation, minification, and conversion tools.
Key Features
- Real-time syntax validation with detailed error line markers
- Beautify JSON with configurable 2-space or 4-space indentation
- Minify JSON to single line for API payloads
- Interactive collapsible tree view node inspector
- Convert JSON to YAML, XML, or CSV
How to Use JSON Formatter & Validator
- Paste your raw JSON string into the editor.
- View instant syntax error detection or click Beautify JSON.
- Expand or collapse node keys in the visual tree viewer.
- Copy formatted JSON or download as a .json file.
Frequently Asked Questions
Why does my JSON show a syntax error?
JSON requires double quotes around keys and strings, no trailing commas after last elements, and matching brackets.
Can I format huge JSON payloads (>10MB)?
Yes, our high-performance client parser handles large JSON files smoothly.
Is my sensitive API JSON payload transmitted to any server?
No, parsing and formatting occurs 100% in local browser JavaScript.
Can I minify JSON to reduce payload bandwidth?
Yes, click Minify JSON to strip unnecessary whitespace and line breaks.