📚 JSON Formatter & Validator
Validate, format, and minify JSON data instantly. Perfect for debugging APIs, testing JSON responses, or cleaning up messy JSON strings.
✨ Features
- Real-time validation: Instantly detect JSON syntax errors
- Beautify & Format: Properly indent and structure your JSON
- Minify: Remove whitespace to reduce file size
- Copy & Download: Easy export options
- Character Counter: Track JSON size and line count
- Syntax Highlighting: Color-coded for better readability
📋 How to Use the JSON Formatter
- Paste your JSON into the input box, or load one of the Quick Examples to see how it works.
- Select Format & Validate. A green status means the JSON is valid and the output is indented for reading.
- If the status shows an error, fix the problem it describes and run it again.
- Select Minify to strip whitespace, then Copy or Download the result.
🎯 When to Use It
- Debugging an API response that arrives as one unreadable line.
- Checking a config file for syntax errors before deploying it.
- Shrinking JSON before embedding it in a request or a script.
- Checking exported data from a database or spreadsheet.
💡 Tips & Common Pitfalls
- Keys and strings need double quotes. Single quotes are valid JavaScript but not valid JSON.
- A trailing comma after the last item is the most common cause of a parse error.
- JSON has no comments. Remove any // or /* */ lines before validating.
- Numbers such as 007 with leading zeros are invalid. Quote them as strings if you need to keep the zeros.
❓ Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format that's easy for humans to read and write, and easy for machines to parse and generate. It's commonly used in APIs and configuration files.
How do I fix JSON syntax errors?
Common JSON errors include missing commas, trailing commas, unquoted keys, single quotes instead of double quotes, and unescaped special characters. Our validator will pinpoint the exact error location.
What's the difference between format and minify?
Formatting adds proper indentation and line breaks for readability. Minifying removes all unnecessary whitespace to reduce file size, useful for production environments.
Is my data secure?
Yes! All JSON processing happens entirely in your browser. Your data never leaves your computer and is not sent to our servers.
Can I validate large JSON files?
Yes, but very large files (>5MB) may slow down your browser. For optimal performance, we recommend files under 1MB.