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Free browser tool

JSON formatter and validator

Pretty-print JSON and catch syntax errors before using it in conversions.

Use the tool

Runs in your browser. Nothing is uploaded while you inspect or transform this sample data.

Input

Output

Run the tool to see output.

When to use it

Use this before a production conversion to verify structure, spot malformed rows, and choose the right FileTypeConverters option. For repeatable work, move from this browser tool to the converter, API, or MCP server.