Validate API payloads
Paste request or response JSON to verify syntax and identify exact error positions.
JSON Formatter
Format, minify and validate JSON in real time. Strict parser with clear error location for quick fixes.
Input JSON
Paste valid JSON text. Processing runs automatically after typing.
Output
Tree view supports expand/collapse. Click the +/- badge to toggle nodes.
Formatted tree will appear here.
About This Tool
This JSON formatter helps you pretty-print, minify, and validate JSON with strict JSON.parse behavior.
It is useful for API debugging, config cleanup, and quick syntax checks before sharing data.
Best Use Cases
Read nested structures
Use pretty mode and tree expansion to inspect deeply nested objects and arrays faster.
Prepare compact output
Switch to minify mode when you need compact JSON for transport or embedding.
Frequently Asked Questions
Does this tool accept JSON5 or comments?
No. This tool uses strict JSON.parse, so comments, trailing commas, and JSON5 syntax are rejected.
What is the difference between Pretty and Minify?
Pretty adds indentation for readability, while Minify removes extra spaces and line breaks to reduce size.
Is my JSON uploaded to a server?
No server upload is required for normal use. Formatting and validation run in your browser.
Why do I see line and column in errors?
The parser reports error position so you can jump directly to the invalid part and fix it quickly.