JSON Formatter, Minifier & Validator
Beautify messy JSON, squeeze it down for production, or check it's valid with clear line-and-column error messages. All processed locally in your browser.
Drag & Drop a JSON File
Or paste your JSON directly into the editor
Nothing you paste or upload ever leaves your browser.
Your JSON
Not CheckedHow to Use the JSON Tool
1. Add Your JSON
Upload a .json file, drag one in, or paste your JSON directly.
2. Beautify, Minify, or Validate
Pick an indent size and beautify it, compress it down, or just check it's valid.
3. Copy or Download
Grab the result with one click, or download it as a new .json file.
Why Use Our JSON Tool?
🔒 100% Client-Side
Your JSON is never uploaded to a server, ensuring absolute privacy.
âš¡ Lightning Fast
Formatting and validation happen instantly as you work.
🎯 Precise Errors
Invalid JSON gets a clear message pointing to the line and column at fault.
📄 No File Limits
Format documents of any size your browser's memory can handle.
Frequently Asked Questions
Beautify adds indentation and line breaks so your JSON is easy to read. Minify strips all unnecessary whitespace to make the file as small as possible, ideal for production use.
Common issues include trailing commas, single quotes instead of double quotes, unquoted keys, or comments — none of which are valid in standard JSON. The error message tells you exactly where the parser stopped.
No, this tool validates strict, standard JSON only. Comments, trailing commas, and unquoted keys will be flagged as errors.