Lightweight JSON text parser

LwJSON is a generic JSON parser library optimized for embedded systems. Supports streaming parsing or classic parsing with full JSON data available in one big linear memory. The first is optimized for ultra-small microcontrollers, while the second is better suited for PC applications, or simply when several kB of RAM are available.

Open documentation

Features

• Written in C (C11), compatible with stdint.h data types
• RFC 4627 and RFC 8259 compliant
• Based on static token allocation with optional application dynamic pre-allocation
• No recursion during parse operation
• Re-entrant functions
• Zero-copy, no malloc or free functions used
• Supports streaming parsing as secondary option
• Optional support for inline comments with /* comment... */ syntax between any blank region of input string
• JSON serializer separate module, with fixed-buffer or callback-driven chunked output
• Optional 64-bit integer serialization
• Stream parser stack-sequence helper macros for matching nested structures
• Distinct integer and real number token types
• Dedicated string escape/unescape utility API
• Advanced find algorithm for tokens
• Test coverage is available
• User friendly MIT license

Contribute

Fresh contributions are always welcome. Simple instructions to proceed:

1. Fork Github repository
2. Follow C style & coding rules and use clang-format to format the code
3. Create a pull request to develop branch with new features or bug fixes

Alternatively you may:

1. Report a bug
2. Ask for a feature request