MessagePack Inspector
Decode MessagePack binary into readable JSON structures. Debug compact payloads without hex dumps — local decoding, free, no signup.
How to Use the MessagePack Inspector
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Frequently Asked Questions
Why MessagePack over JSON?
Half the bytes with schema-less flexibility — IoT and game protocols choose it for bandwidth. Inspect here when JSON tooling can't read the wire.
How do I view the structure?
Paste hex or upload bytes: decoded maps and arrays render as JSON with types annotated. Timestamps decode per ext-type where known.
Malformed payloads?
Truncated buffers report the exact failing offset. Compare against the encoder's output length to find cut connections.
Is binary data uploaded?
No — decoding runs locally in your browser. Payloads never leave your device.
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Last updated October 2026