Your data is never sent to a server or stored anywhere. All processing happens in your browser.

JSON Formatter / JSON Viewer

Samples Click to load sample JSON
Indent
Formatted Output 
 
 
 
How to Use
 
 
Type or paste JSON data into the textarea to see it automatically formatted. Choose between 2-space or 4-space indentation. If your JSON contains syntax errors, an error message will appear. Use the copy button to copy the formatted output to your clipboard.
 
What Is JSON
 
 
JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is widely used in web APIs, configuration files, and data storage. Pretty-printed JSON with proper indentation makes nested structures visually clear, which is invaluable for debugging and code review.
 
Use Cases
 
 
  • Debugging API responses — pretty-print minified JSON to understand the structure at a glance
  • Formatting config files — clean up package.json, tsconfig.json, and other configuration files
  • Log analysis — expand single-line JSON log entries to inspect their contents
  • Data validation — instantly detect JSON syntax errors and pinpoint the issue
 
Key Features
 
 
  • Instant syntax error detection — catches missing brackets, extra commas, and other issues in real time
  • Duplicate key warnings — alerts you when the same key appears twice in an object
  • Indentation toggle — switch between 2-space and 4-space indentation with one click
  • Large file support — handles big JSON payloads including BigInt values efficiently
 
Practical Tips
 
 
When inspecting API responses, paste them here first to get a clear picture of the structure. While this tool doesn't filter by key like jq, it's ideal for visual exploration of the full payload. Run your config files through the formatter before saving to catch syntax issues before they cause deployment failures.
 
Privacy
 
 
All JSON processing happens entirely in your browser. Your data is never sent to a server, stored, or logged. You can safely paste sensitive or proprietary data.