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JSON Formatter & Validator
Validate JSON syntax, pretty-print or minify structured data locally, and download the result. Designed for developers and AI-agent workflows.
Also reports top-level data type, property or item count, and JSON parse errors.
How it works
A simple tool for a specific job.
Use the result as a starting point; review important decisions independently.
01 / STEP
Paste your JSON
Use structured data from an app, prompt or API response.
02 / STEP
Check syntax
See whether the document parses correctly.
03 / STEP
Use the output
Copy the formatted JSON or download a file.
Frequently asked questions
Good to know.
Does this send my JSON to an AI model?
No. JavaScript parses the text within your browser.
Does valid JSON mean valid API data?
No. JSON syntax validity is different from compliance with a particular API schema.
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