koajs / is-json Goto Github PK
View Code? Open in Web Editor NEWcheck if a koa body should be interpreted as JSON
License: MIT License
check if a koa body should be interpreted as JSON
License: MIT License
Why is true
JSON but not false
? Or 5
JSON but not 0
? Of all the falsey values, only undefined
cannot be stringified and is not valid JSON by any RFC/specification. true
, 5
, and 2.5
may or may not be valid JSON depending on what authority you cite, but I cannot conceive of a justifcation for including them while excluding , null
false
, 0
, and 0.0
.
The inconsistency seems problematic due to the use of this package within KOA itself. The behavior is wrong, yet deviation in custom middleware could cause as many bugs as it fixes.
(Update: I should acknowledge that there does need to be one value which indicates that there is no value, and that while undefined
is most likely the clear winner, excluding null
is likely to produce breaking changes in Koa with meaningful impact).
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