Input JSON
Formatted Output
JSON Formatter & Validator
Format, validate, and beautify JSON data. Paste text or upload files for instant syntax checking
Features
Instant Formatting
Format JSON with proper indentation and structure in one click
Syntax Validation
Check JSON syntax and get clear error messages with line numbers
File Upload
Upload JSON files directly from your computer for validation
Minify JSON
Remove whitespace and compress JSON to a single line
Copy & Download
Copy formatted JSON to clipboard or download as a file
Common Questions
This tool formats unreadable JSON into properly indented, easy-to-read text. It also validates the syntax and highlights any errors with specific line numbers.
When you paste invalid JSON, the tool shows the exact error and line number. Common issues include missing commas, unclosed brackets, or unquoted keys. Check the error message and fix the specified line.
No. All processing happens in your browser. Your JSON data never leaves your computer or gets sent to any server.
Format adds indentation and line breaks to make JSON readable. Minify does the opposite - it removes all whitespace to create the smallest possible file size.
Yes, click the "Upload File" button to load JSON from your computer. The tool supports JSON and TXT files up to 10MB.
Yes, but very large files (over 5MB) may slow down your browser since processing happens locally. For huge files, consider using a desktop editor.