📁 Drag & drop file here, or click to select
Results will appear here...
Hex view will appear here...
The MessagePack Viewer is a free online tool for viewing, encoding, and decoding MessagePack binary data. It supports JSON-to-MessagePack conversion, hex binary viewing, and file drag-and-drop import, helping developers debug and analyze MessagePack data without installing any software.
1. Select the "Encode" tab and paste JSON data in the input box; or select "Decode" tab and paste MessagePack hex string
2. Set encoding options (compact/compatible mode) and hex output format
3. Click "Execute" to view the conversion result in the output area
4. The hex view area shows formatted hexadecimal binary data with offset and ASCII comparison
5. Use "Copy Result" to copy to clipboard, or "Download" to save as a file
6. Keyboard shortcut: Ctrl+Enter to execute quickly
Developers using MessagePack as RPC serialization format need to verify encoded binary data. Use this tool to quickly validate encoding results.
Cache systems like Redis use MessagePack to store data. Operations staff need to view MessagePack content in cache. Use this tool for quick decoding and analysis.
In microservice architectures, different language services exchange data using MessagePack. Developers need to verify data format and content consistency.
IoT devices often use MessagePack to compress communication data. Embedded developers need to decode binary messages from devices for debugging.
MessagePack was created by Sadayuki Furuhashi in 2011 as a more compact and efficient binary serialization format than JSON. It uses type prefix bytes to distinguish data types: positive integers use 0x00-0x7f directly, negative integers use 0xe0-0xff, strings use 0xa0-0xbf prefix with length, etc. MessagePack 5.0 added Timestamp extension types (str8/str16/str32). Compared to Protocol Buffers and Thrift, MessagePack can be used without schema definitions, closer to JSON's usage pattern, but with higher serialization efficiency.
MessagePack is an efficient binary serialization format, similar to JSON but more compact and faster. It's commonly used for RPC communication, cache storage, and cross-language data exchange.
Supports JSON text input, Hex string input, and drag-and-drop file import. Input JSON to encode to MessagePack, or input Hex to decode to JSON.
No. All encoding and decoding is done locally in the browser. No data is sent to any server, and it works even offline.
MessagePack is a binary format that's more compact (typically 30-50% smaller) and faster to parse than JSON. However, JSON is more human-readable and easier to edit.
Supports all standard types: nil, boolean, integers, floats, strings, binary, arrays, maps, and Timestamp extension types.
Yes. In batch mode, you can encode/decode multiple independent MessagePack messages one by one, with results displayed separately.