01
Paste JSON
Add the JSON text you want to validate or format into the input area.
JSON Validator & Formatter
Validate, format, and minify JSON data locally in your browser.
Local browser processing
JSON validation and formatting run in your browser. Your data is not sent to Magmatum servers.
Magmatum JSON Validator · Browser Processing · 2026
How to use
How to use the JSON Validator
Paste your JSON into the tool, then validate, format, or minify it depending on your needs.
02
Validate syntax
The tool will show whether the JSON is valid or contains syntax errors.
03
Format or minify
Use formatting to make it readable or minify it to reduce size.
04
Copy output
Copy the processed JSON and use it directly in your project.
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