What is this tool?
Format, beautify, inspect, and minify JSON code directly in your browser. Features syntax error line/column tracking, object key sorting, collapsible tree visualization, and file export options.
When to use it?
Format unreadable single-line JSON payloads from API responses, inspect complex nested configuration files, minify payloads before network transmission, or diagnose syntax errors in JSON datasets.
How does it work?
Parses the input string using the browser V8 JavaScript engine JSON parser. Valid payloads are formatted with configurable indentation (2 spaces, 4 spaces, or tabs) or stripped of whitespace delimiters. Invalid payloads trigger parser diagnostic routines that calculate line and column offsets.
Technical Specifications & Standards
Compliant with RFC 8259 and ECMA-404 JSON data interchange format specifications. Keys must be double-quoted strings, and numbers must adhere to IEEE 754 floating-point representations.
Operating Limits & Considerations
- Large inputs exceeding 5 MB may slow down client-side syntax highlighting and tree rendering. For files over 2 MB, automatic background validation is deferred to manual button triggers.
- Numbers exceeding 64-bit float precision (above Number.MAX_SAFE_INTEGER / 9007199254740991) may lose precision during standard JSON.parse.
Common Mistakes & Solutions
Adding a comma after the final key in an object or array causes a syntax error.
JSON syntax strictly requires double quotes (") around keys and string values.
Example Conversions
{"name":"API Gateway","routes":[{"path":"/v1/users","auth":true}]}{
"name": "API Gateway",
"routes": [
{
"path": "/v1/users",
"auth": true
}
]
}Standards & Technical References
Frequently Asked Questions
No. The official JSON standard (RFC 8259) prohibits comments (// or /* */) and trailing commas. If your payload uses comments, it is JSON5 or JSONC, not standard JSON.
Yes. You can drag and drop or upload JSON files up to 5 MB. The file is read directly into browser memory via FileReader and formatted without network transmission.