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Show HN: I built a JSON and JSON5 parser with MISRA C conformance (railgunlabs.com)

6 points by hgs3 ↗ HN
Hello everyone. I built Judo: a JSON(5) parser with MISRA C conformance.

For those who don't know, JSON5 is an unofficial extension of JSON that incorporates features from ECMAScript 5.1 (ES5). I designed Judo to be customizable, so you can stick with standard JSON if you'd prefer.

About me: I'm a solo developer and I quit my Big Corp job to pursue my passion for software development. Judo is my 5th commercial release.

5 comments

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jbreckmckye
Really interesting, I wonder how fast this parser is.

What are the contexts where I need a MISRA C package for parsing JSON? Just embedded systems or can you see a wider usecase?

hgs3
Embedded systems are the primary use case, but any safety critical system would presumably want this.

My focus wasn't speed, but rather high-assurance. On a resource-constrained embedded system, you're likely not working with huge JSON structures. The scanner processes JSON incrementally, so if memory pressure is a concern, you can do your processing in small, incremental chunks.

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thebruce87m
I feel like the Venn diagram of people who need a MISRA JSON parser and the people who can use a AGPL-3.0 library in their (probably) embedded product has no overlap - who is the target for this?
hgs3
Commercially speaking, the target audience is embedded developers. It's FOSS because, a few months back, I released a MISRA compliant Unicode algorithms library [1] and I received comments on HN asking why it wasn't under a FOSS license. With this project, I wanted to experiment with dual-licensing. I'm using a copyleft license because I fear a permissive license will mean no sales.

[1] https://news.ycombinator.com/item?id=42423988