JSON Formatter & Validator

Parse JSON with precise syntax errors, then format nested objects with selectable indentation.

About this tool

How it works

Use the formatted JSON to spot missing commas or invalid nesting before sending it to an API.
This checks JSON syntax, not a JSON Schema or API rules. Valid JSON can also be a number, string, true, false, or null.

Paste a complete JSON value, such as {"name":"Ada","active":true}; choose 2 or 4 spaces for indentation.

Example: {"name":"Ada","active":true}

Processed locally in your browser; nothing is uploaded.