Free JSON Formatter — Format JSON Online
Free online JSON formatter. Format, minify, and explore JSON with a collapsible tree view, and validate with error location.
About Free JSON Formatter — Format JSON Online
JSON Formatter beautifies, minifies, and validates JSON, and lets you explore it as a collapsible tree. Paste JSON or open a file, catch syntax errors with the exact character position, and copy or download the result. Everything runs in your browser, so your data stays private. It is completely free and runs entirely online — just open the page and start using it.
Features
- Pretty-print JSON with clean 2-space indentation
- Minify JSON to the smallest valid form
- Explore a collapsible tree view with expand and collapse all
- Validate JSON with the exact error position
- Copy the result or download it as a .json file
How to use Free JSON Formatter — Format JSON Online
- 1Paste your JSON, or open a .json file.
- 2Switch between Pretty, Compressed, and Tree views.
- 3Fix any errors using the reported position.
- 4Copy or download the formatted JSON.
Frequently asked questions
- Is my JSON uploaded to a server?
- No. Formatting and validation run entirely in your browser, so your data never leaves your device.
- What happens if my JSON is invalid?
- You get a clear error message with the character position so you can locate and fix the problem quickly.
- Can I explore large, nested JSON?
- Yes. The tree view lets you expand and collapse nodes to navigate deeply nested structures.