What does this tool do
The JSON Beautifier formats, validates, and minifies JSON. Paste JSON and choose indentation (2 or 4 spaces, tabs) to get readable output. Invalid JSON shows an inline error with details. Valid JSON displays a collapsible tree view. Minify removes whitespace for compact output. Copy the result with one click.
How to use it
- Paste JSON — Paste your JSON string into the input area.
- Format — Click Format or adjust indentation (2/4 spaces or tabs). The output updates.
- Validate — Invalid JSON shows an error message with position; valid JSON shows the tree view.
- Minify — Click Minify to remove whitespace and newlines.
- Copy — Copy the formatted or minified output to the clipboard.
How it works
The tool parses the input with JSON.parse(). If parsing fails, it displays the error message (e.g. unexpected token, position). If valid, it reformats with the chosen indentation or minifies by JSON.stringify with no extra whitespace. The tree view is built from the parsed structure for easier navigation. All processing runs client-side.
All computation runs entirely in your browser. No data is sent to any server.
Use cases & examples
- API responses — Format JSON from APIs for readability.
- Config files — Beautify or minify JSON config.
- Debugging — Validate and inspect JSON structure.
- Documentation — Produce clean samples for docs.
- Bundling — Minify JSON for smaller bundle size.
Example
Input: {"name":"Alice","age":30}
Formatted (2 spaces):
{
"name": "Alice",
"age": 30
}
Minified: {"name":"Alice","age":30}
Limitations & known constraints
- JSON only — Does not support JSON5, JSONC, or trailing commas.
- Large files — Very large JSON may slow the tree view.
- No lint — Validates syntax only; does not check schema or semantic rules.