π¦ MessagePack Viewer
What Can the MessagePack Viewer Do?
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.
Core Features
- JSON to MessagePack: Encode JSON data into MessagePack binary format, output hex string with intuitive binary representation
- MessagePack to JSON: Decode hex-formatted MessagePack data into readable JSON for easy viewing and analysis
- Hex Binary View: Display MessagePack data in hexadecimal format with offset and ASCII comparison
- Compression Ratio: Real-time calculation of MessagePack vs JSON size comparison showing compression efficiency
- File Import: Support drag-and-drop .msgpack or binary files for direct decoding
- Multiple Hex Formats: Support space-separated, continuous, and 0x-prefix hex output formats
How to Use
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
Use Cases
Case 1: RPC Communication Debugging
Developers using MessagePack as RPC serialization format need to verify encoded binary data. Use this tool to quickly validate encoding results.
Case 2: Cache Data Analysis
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.
Case 3: Cross-Language Data Exchange
In microservice architectures, different language services exchange data using MessagePack. Developers need to verify data format and content consistency.
Case 4: IoT Device Communication
IoT devices often use MessagePack to compress communication data. Embedded developers need to decode binary messages from devices for debugging.
Technical Background
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.
β What is MessagePack?
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.
β What input formats are supported?
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.
β Does this tool upload my data?
No. All encoding and decoding is done locally in the browser. No data is sent to any server, and it works even offline.
β What's the difference between MessagePack and JSON?
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.
β What MessagePack data types are supported?
Supports all standard types: nil, boolean, integers, floats, strings, binary, arrays, maps, and Timestamp extension types.
β Can I batch process multiple MessagePack messages?
Yes. In batch mode, you can encode/decode multiple independent MessagePack messages one by one, with results displayed separately.