MessagePack Pro Converter
Convert between JSON and MessagePack binary format. Supports timestamps, binary data, and extension types.
About MessagePack
MessagePack is an efficient binary serialization format that's smaller and faster than JSON. It's used in applications where bandwidth and storage efficiency matter, like IoT, gaming, and real-time systems.
Compact Size
Binary format uses fewer bytes than text-based JSON. Numbers and small strings are especially efficient.
Extension Types
Supports custom types like timestamps (-1), preserving type information that JSON loses.
Binary Data
Native binary support without Base64 encoding. Perfect for images, files, and raw bytes.
Cross-Platform
Libraries available for 50+ languages including JavaScript, Python, Go, Rust, and more.
Fast Parsing
Binary format can be parsed without tokenization, making it faster than JSON parsing.
Type Preservation
Distinguishes between integers and floats, maps and arrays. No type ambiguity.
MessagePack Type Reference
| Type | Format | Range / Notes |
|---|---|---|
| positive fixint | 0xxxxxxx | 0 to 127 |
| negative fixint | 111xxxxx | -32 to -1 |
| fixstr | 101xxxxx | 0-31 bytes |
| fixarray | 1001xxxx | 0-15 elements |
| fixmap | 1000xxxx | 0-15 pairs |
| ext (timestamp) | type = -1 | Nanosecond precision |