Free JSON Formatter & Validator
Format messy JSON, minify it, and validate syntax with clear error feedback. Your data stays in your browser.
Privacy: parsing and formatting run locally in this browser. Avoid pasting secrets, access tokens, or private production data into any online tool.
How to Use the JSON Formatter
- Paste your JSON text into the input area.
- Choose the indentation level you prefer.
- Click Format JSON to make the structure easier to read, or Minify JSON to remove unnecessary whitespace.
- Use Validate to check whether the input is valid JSON. Copy the result when ready.
What is JSON?
JSON (JavaScript Object Notation) is a text format commonly used to exchange structured data between applications and APIs. A JSON formatter adds consistent indentation to valid JSON, while a validator checks whether the text follows JSON syntax.
Common JSON errors
- Missing double quotes around property names or string values.
- Trailing commas after the final item in an object or array.
- Unclosed braces, brackets, or quotation marks.
- Using single quotes instead of JSON’s required double quotes for strings.
Frequently Asked Questions
Does this tool send my JSON to a server?
No. The formatting and validation actions use your browser’s built-in JSON parser and do not send the entered data to a ToolsBoxly server.
What is the difference between formatting and minifying?
Formatting adds indentation and line breaks for readability. Minifying removes unnecessary whitespace to reduce the text size without changing the parsed data.
Can this tool fix invalid JSON automatically?
It identifies syntax errors but does not guess how to repair them. Correct the reported issue in your input and validate again.
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