Question 1

How to parse JSON incrementally with libjson from a network stream?

Accepted Answer

Initialize the parser with a callback using json_parser_init, then feed data chunks as they arrive using json_parser_string. Handle parsing errors immediately and use json_parser_is_done to check for completion, allowing real-time processing without loading the entire document.

Question 2

libjson vs cJSON: which is better for embedded C projects?

Accepted Answer

libjson is lighter and uses a SAX-style API for low-memory parsing, ideal for strict constraints. cJSON provides a full object model but has higher overhead. Choose libjson if control and footprint are critical; cJSON for easier data access.

Question 3

Can libjson handle large JSON files without running out of memory?

Accepted Answer

Yes, its interruptible parser processes data incrementally, and optional limits on nesting and size prevent resource exhaustion. However, users must manage callbacks efficiently to avoid bottlenecks in high-volume streams.

Question 4

How to integrate libjson into a C project without using autotools?

Accepted Answer

Directly include the source files in your project, as recommended in the README for portability. Use the simple API calls like json_parser_init and json_printer_raw, and link manually, avoiding dependency on the minimal build system.

Question 5

Does libjson support JSON comments in parsing?

Accepted Answer

Optionally, yes. Configure the parser via the config structure to ignore YAML/Python-style or C-style comments. By default, comments are disallowed to maintain strict RFC 4627 compliance, but this can be enabled for flexibility.

Question 6

What are the security features in libjson for preventing attacks?

Accepted Answer

It offers optional limits on nesting depth and data size to mitigate resource exhaustion. Additionally, UTF-8 validation ensures correct encoding, and users can implement custom checks in callbacks for further security.

libjson

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