Question 1

jsx vs jiffy for Erlang JSON processing

Accepted Answer

jsx offers more features like streaming, formatting, and pragmatic extensions, while jiffy is often preferred for its speed and strict JSON compliance. Choose jsx for flexibility with real-world data, but jiffy might be better for high-performance, simple parsing.

Question 2

How to parse JSON with comments in Erlang

Accepted Answer

Use jsx with default settings, as it allows C/C++ style comments automatically. For example, 'jsx:decode(<<"{/* comment */ \"key\":\"value\"}">>, [])' works. Enable strict mode with '{strict, [comments]}' to disallow comments.

Question 3

Does jsx support streaming JSON in Erlang?

Accepted Answer

Yes, jsx supports streaming with the 'stream' option. You can parse incomplete JSON and resume with more data, useful for large files or network streams, as shown in the incomplete input examples with 'incomplete' functions.

Question 4

How to minify JSON in Erlang with jsx

Accepted Answer

Use the 'jsx:minify/1' function to remove all whitespace from JSON text. For example, 'jsx:minify(<<"{\"a\": 1}">>)' returns '<<"{\"a\":1}">>'. It's a built-in utility for compact output without manual formatting.

Question 5

Erlang jsx encode datetime to ISO 8601

Accepted Answer

jsx automatically encodes Erlang datetime tuples (e.g., from 'erlang:localtime/0') as ISO 8601 strings in UTC. Just include the tuple in your term, and 'jsx:encode/1,2' will handle the conversion, but decoding won't convert back.

Question 6

jsx strict mode how to enable

Accepted Answer

Enable strict mode by passing 'strict' or '{strict, [options]}' in the options list. For example, 'jsx:decode(JSON, [strict])' disallows all extensions like comments and trailing commas, ensuring strict JSON compliance.

Question 7

How to use jsx callback module for custom JSON processing

Accepted Answer

Implement a module with 'init/1' and 'handle_event/2' functions to handle events like 'start_object' or '{string, binary()}'. Then use 'jsx:decoder/3' to create a parser that calls your module for semantic analysis.

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