MessagePack Encode/Decode

Online MessagePack encode/decode tool with JSON conversion, hex/Base64/C-array output, and byte viewer for protocol analysis, IoT debugging, and binary payload troubleshooting.

Input Format

MessagePack Data

Paste MessagePack bytes from packet capture, device logs, or API payloads.

Click to insert sample data

Decoded Result

Enter MessagePack data to decode and view result

Documentation

What is MessagePack Codec

This tool converts between JSON and MessagePack binary data with multiple byte-view formats, useful for API debugging and packet inspection.

Key Features

Decode MessagePack into readable JSON.
Encode JSON into MessagePack bytes.
Convert among hex, base64, and C-array output formats.
Provide byte viewer and size comparison details.

Steps

Paste binary input in Decode tab and choose format.
Review decoded output and byte details.
Enter JSON in Encode tab and select output format.
Copy output for transport, storage, or tests.

FAQ

Why does decode fail?

Most often due to wrong input format, truncated payload, or invalid MessagePack content.

Is MessagePack always smaller than JSON?

Not always, but it is usually more compact for structured numeric payloads and short keys.