JSON Formatter
Format, minify, and validate JSON data
Input
Valid JSON
Indent Size:
What is JSON Formatter?
JSON Formatter takes raw or minified JSON and formats it with proper indentation for readability, or compacts formatted JSON into a single line to save space. It also validates JSON syntax and highlights errors with line numbers, making it essential for API debugging and data inspection.
How to use
- Step 1 — Paste your JSON string into the input area. The tool automatically detects syntax errors and highlights them.
- Step 2 — Choose your indent size (2 or 4 spaces, or tabs) and click Format to pretty-print, or Minify to compress to a single line.
- Step 3 — Copy the formatted output or download it as a .json file. Use the tree view toggle to explore nested structures visually.
Result
An API returns a minified 500-line JSON response. Paste it in, select 2-space indent, and instantly see the nested structure with collapsible sections — making it easy to find the 'user.preferences.notifications' path you need.