this post was submitted on 15 Sep 2024

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Programming

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RFC 7493: The I-JSON Message Format (datatracker.ietf.org)

submitted 3 months ago by lysdexic to c/programming

17 comments fedilink hide all child comments

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[–] [email protected] 16 points 3 months ago* (last edited 3 months ago) (1 children)

A summary:

An old proposal (2015, not sure why OP posted it now), that basically proposes to put some more standards and limitations around JSON formatting to make it more predictable. Most of it seems pretty reasonable:

Must be UTF-8 encoded and properly escape Unicode characters
Numbers must respect the JavaScript number Type and it's limitations (i.e. max magnitude of an int etc.)
Objects can't have duplicate keys
The order of keys in objects does not matter
A JSON file does not need to have a top level object or array, it can be any JSON value (i.e. just a string or a number is still valid JSON).
It proposes that when processing JSON, any unrecognized keys should be ignored rather than errored

It recommends:

Specific formats for date-time data
That binary data be stored as a bas64url string

Honestly, the only part of this I dislike is the order of keys not mattering. I get that in a bunch of languages they use dictionary objects that don't preserve order, but backend languages have a lot more headroom to adapt and create objects that can, vs making a JavaScript thread loop over an object an extra time to reorder it every time it receives data.

[–] GTG3000 6 points 3 months ago (1 children)

Personally, I prefer duplicate keys to be eaten by the parser but I can see how it'd be beneficial to prevent them.

[–] [email protected] 3 points 3 months ago* (last edited 3 months ago)

I'm honestly unsure if they intend the 'must-ignore' policy to mean to eat duplicate keys without erroring, or just to eat keys that are unexpected based on some contract or schema....

[–] [email protected] 8 points 3 months ago (1 children)

Just skimmed but seems like a decent idea. Not that I've knowingly run into issues parsing JSON too much

[–] towerful 7 points 3 months ago (1 children)

It's from 2015, so its probably what you are doing anyway

[–] lysdexic 2 points 3 months ago* (last edited 3 months ago)

It’s from 2015, so its probably what you are doing anyway

No, you are probably not using this at all. The problem with JSON is that this details are all handled in an implementation-defined way, and most implementation just fail/round silently.

Just give it a try and send down the wire a JSON with, say, a huge integer, and see if that triggers a parsing error. For starters, in .NET both Newtonsoft and System.Text.Json set a limit of 64 bits.

https://learn.microsoft.com/en-us/dotnet/api/system.text.json.jsonserializeroptions.maxdepth

[–] [email protected] 7 points 3 months ago* (last edited 3 months ago) (2 children)

Why restrict to 54-bit signed integers? Is there some common language I'm not thinking of that has this as its limit?

Edit: Found it myself, it's the range where you can store an integer in a double precision float without error. I suppose that makes sense for maximum compatibility, but feels gross if we're already identifying value types. I don't come from a web-dev/js background, though, so maybe it makes more sense there.

[–] lysdexic 4 points 3 months ago* (last edited 3 months ago)

Why restrict to 54-bit signed integers?

Because number is a double, and IEEE754 specifies the mantissa of double-precision numbers as 53bits+sign.

Meaning, it's the highest integer precision that a double-precision object can express.

I suppose that makes sense for maximum compatibility, but feels gross if we’re already identifying value types.

It's not about compatibility. It's because JSON only has a number type which covers both floating point and integers, and number is implemented as a double-precision value. If you have to express integers with a double-precision type, when you go beyond 53bits you will start to experience loss of precision, which goes completely against the notion of an integer.

[–] [email protected] 3 points 3 months ago

I didn't think you realize just how much code is written in JavaScript these days.

[+] [email protected] -7 points 3 months ago (3 children)

[removed by mod]

[–] lysdexic 17 points 3 months ago (1 children)

Ok.

[–] [email protected] 9 points 3 months ago

Tbh this is a programming community. While yes, a quick summary would not have gone amiss, I don't fault OP for not including it. RFCs are often pretty dry but this one is reasonably straightforward as a subset of JSON to reduce some ambiguity.

[–] [email protected] -4 points 3 months ago* (last edited 3 months ago) (1 children)

Imo the only ones that should feel bad about it are those upvoting it.

Edit: lemmy is mostly low effort stuff and not interesting discussions. So while this post provides nothing of value that is something the voting system is supposed to handle

[–] [email protected] -4 points 3 months ago (2 children)

Yeah, the quality on Lemmy is nowhere near what Reddit was back in its heyday 10+ years ago; mostly due to the quality of the users; users who think content like this is worthy of posting and upvoting.

[–] [email protected] 4 points 3 months ago* (last edited 3 months ago)

Dude, go drink a coffee, and then reflect on what a negative little bitch you're being.

The quality on Lemmy is somewhat worse than Reddit 10 years ago, entirely because the user base is a fraction of the size and is more equivalent to when Reddit was first growing 15-20 years ago. Even then it was only a success because they bootstrapped it using fake posts and comments.

Lemmy is doing great, what it needs to grow is a positive and welcoming community, and then for Reddit to do something stupid again to trigger an exodus.

[–] lysdexic 1 points 3 months ago* (last edited 3 months ago) (1 children)

Yeah, the quality on Lemmy is nowhere (...)

Go ahead and contribute things that you find interesting instead of wasting your time whining about what others might like.

So far, all you're contributing is whiny shitposting. You can find plenty of that in Reddit too.

[–] [email protected] -2 points 3 months ago (1 children)

You're clearly one of the reasons the quality is so low. Wasting everyone's time using lemmy as your personal link aggregator. It's obnoxious af.

[–] recursive_recursion 2 points 3 months ago* (last edited 3 months ago)

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