fix-decoder | Unravels FIX messages into human readable tables | Messaging library
kandi X-RAY | fix-decoder Summary
kandi X-RAY | fix-decoder Summary
Visit the live site at [![Screenshot of FIX Decoder] "A screen shot showing FIX Decoder in action"). A convenient and powerful decoder for FIX messages. All processing is done locally in your browser, so no one can snoop on your messages. Unlike the most prominent online FIX message decoder, this version is open source so you can prove that your messages are safe. This version supports a wider range of message representations too, including multiple messages.
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QUESTION
When I look at the definition of a String type in the FIX protocol (e.g. here or here), I don't see a minimum length specified. Is it allowed to use empty strings? One online decoder seems to accept an empty string value (see tag 320), an other complains that it's invalid.
...ANSWER
Answered 2021-Dec-09 at 11:41The FIX 4.4 specification states the following (emphasis in the original text):
Each message is constructed of a stream of
=
fields with a field delimiter between fields in the stream. Tags are of data type TagNum. All tags must have a value specified. Optional fields without values should simply not be specified in the FIX message. A Reject message is the appropriate response to a tag with no value.
That strongly suggests (but does not unambiguously state) to me that the use of an empty value for a string is invalid. It is unsurprising to me that different FIX implementations might treat this edge case in different ways. So, I think the best approach is to avoid using empty values for strings.
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