JSON Formatter & Validator
Make JSON readable, check its syntax, or create a compact single-line result. Your data is processed in your browser and is not sent to a RizeTab server.
JSON editing tool
Enter JSON; you can also press Ctrl/⌘ + Enter to format it.
What Is JSON?
JSON (JavaScript Object Notation) is a text format for structured data. Objects use braces, arrays use brackets, and property names are enclosed in double quotes. It is widely used for API responses, configuration files, and data exports because people can read it and many programming languages can parse it.
{
"user": "Ada",
"roles": ["editor", "admin"],
"active": true
}Formatting, Validation, and Minification
Format
Adds indentation and line breaks so nested data is easier to inspect.
Validate
Checks whether the text follows standard JSON syntax.
Minify
Removes unnecessary whitespace to produce a compact result.
How to Use the Formatter
- Paste raw JSON into the input editor.
- Choose 2 or 4 spaces and select Format for readable output.
- Use Validate when you only need a syntax check.
- Select Minify for compact output, then copy the result.
Common JSON Syntax Errors
- A trailing comma after the final property or array item.
- Single quotes or curly quotation marks around keys and strings.
- A missing closing brace or bracket.
- An unescaped double quote inside a string.
- JavaScript-only values such as
undefined, comments, or expressions.
Private, Data-Only Processing
The tool reads input strictly as data with JSON.parse() and creates output with JSON.stringify(). It does not use eval, dynamic code execution, or a third-party processing API. When working with sensitive data, remember that clipboard history, browser extensions, screen sharing, and shared devices remain separate local risks.
Understand the Structure Behind the Result
Learn how objects, arrays, keys, values, escaping, and common errors fit together in the practical JSON guide.
Read the JSON guide →Frequently Asked Questions
Is my JSON sent to a server?
No. The page processes JSON with JavaScript in your browser; the tool does not send it to RizeTab for processing.
How can I tell whether JSON is invalid?
Validate checks the syntax. If parsing fails, the tool shows the browser's explanation and, when available, a line and column.
What does minifying JSON do?
It removes indentation and unnecessary whitespace while preserving the parsed data structure.
Does formatting change the data?
Keys and values are preserved; indentation and line breaks are added. Number notation may be normalized in standard JSON output.
Are comments and trailing commas allowed?
No. Standard JSON supports neither comments nor a comma after the last item.