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MessagePack Viewer

v1.0.0

Encode and decode MessagePack binary format to and from JSON

Encodes JSON values into compact MessagePack binary bytes and decodes hex-encoded MessagePack back to readable JSON — all client-side.

How to use
  • →Toggle between Encode and Decode mode using the switcher above the panels.
  • →Paste valid JSON on the left to encode, or hex bytes on the right to decode.
  • →Hex bytes can be pasted with or without spaces — both formats are accepted.
  • →Use the Examples picker to load sample payloads and inspect how different JSON structures map to MessagePack bytes.