JSON Formatter & Validator
Format, minify, and validate JSON data instantly. Detect syntax errors with line numbers, prettify with customizable indentation, and view structure stats.
Features
Everything you need for working with JSON data
Pretty Print
Format JSON with customizable indentation (2 or 4 spaces) for maximum readability.
Minify JSON
Compress JSON by removing all unnecessary whitespace to reduce file size.
Syntax Validation
Detect JSON errors instantly with precise error messages and line numbers.
Structure Stats
View object depth, total key count, and output size in bytes at a glance.
How to Use
Three simple steps
Paste Your JSON
Paste or type your JSON data into the input textarea. It can be formatted or minified.
Choose an Action
Click Format to prettify, Minify to compress, or Validate to check for errors.
Copy the Result
Review the output and stats, then click Copy to copy the result to your clipboard.
Frequently Asked Questions
Is my JSON data sent to a server?
No. Your JSON data is processed locally and never leaves your device. Safe for formatting API keys, configs, and sensitive payloads.
What JSON errors can this tool detect?
The validator catches all standard JSON syntax errors including missing commas, unclosed brackets, trailing commas, single quotes instead of double quotes, and unquoted keys. Error messages include the approximate line number.
Is there a size limit?
There is no hard limit, but very large JSON files (over 10 MB) may cause performance to slow down.
What is the difference between Format and Validate?
Validate only checks if the JSON is valid and reports errors. Format also validates but additionally produces a prettified version in the output area with your chosen indentation.
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