JSON Formatter & Minifier
Format, minify, and validate JSON online. Beautify JSON with proper indentation or compress it for production.
What is JSON Formatting?
JSON (JavaScript Object Notation) formatting transforms compact, hard-to-read JSON into structured, indented text that developers can easily read and debug. A JSON formatter parses the data structure and outputs it with consistent indentation, making nesting levels immediately visible.
JSON minification does the opposite — removing all unnecessary whitespace to reduce file size for production APIs and configuration files sent over networks.
How to Use
- Paste JSON into the input panel or upload a .json file
- Select a mode: Beautify (readable), Minify (compact), or Validate
- Configure indent size and key sorting in Settings if needed
- Copy the result or download as a .json file
Features
- Live formatting as you type
- Beautify with 2-space, 4-space, or tab indentation
- Minify to remove all whitespace
- Syntax validation with clear error messages
- Alphabetical key sorting
- Upload .json files up to 5MB
- Copy output or download as .json
- Keyboard shortcuts (Ctrl+Enter, Ctrl+K, Ctrl+S)
- 100% client-side — JSON never leaves your browser
Frequently Asked Questions
What is the difference between beautify and minify?
Beautifying adds indentation and newlines for human readability. Minifying removes all whitespace to minimize byte size — useful for production APIs where bandwidth matters.
Is my JSON data safe?
Yes. All processing happens locally in your browser using JavaScript's built-in JSON.parse/JSON.stringify. No data is ever sent to a server.
Why sort keys alphabetically?
Sorting keys makes it easier to find properties in large objects and produces consistent output for version-control diffs.
What JSON features are supported?
Standard JSON per RFC 8259: objects, arrays, strings, numbers, booleans, and null. JSON5 extensions like comments and trailing commas are not standard JSON.
Can I format large JSON files?
Files up to 5MB can be uploaded. Very large files may be slow since processing runs on the browser UI thread.