convert string to number node js

Question

I m trying to convert req params to Number because that is what I defined in my schema for year param   I have tried  req params year   parseInt  req params year  10        and  Number  req params year     and  1 req params year    but non of them works   Do I need to install something

User · Answer

Not a full answer  Ok so this is just to supplement the information about parseInt  which is still very valid  Express doesn t allow the req or res objects to be modified at all  immutable   So if you want to modify use this data effectively  you must copy it to another variable  var year   req params year

User · Answer

Using parseInt   is a bad idea mainly because it never fails  Also because some results can be unexpected  like in the case of INFINITY  Below is the function for handling unexpected behaviour   function cleanInt x        x   Number x       return x  gt   0   Math floor x    Math ceil x       See results of below test cases   console log  CleanInt     cleanInt  xyz      ParseInt     parseInt  xyz     console log  CleanInt     cleanInt  123abc      ParseInt     parseInt  123abc     console log  CleanInt     cleanInt  234      ParseInt     parseInt  234     console log  CleanInt     cleanInt  -679      ParseInt     parseInt  -679     console log  CleanInt     cleanInt  897 0998      ParseInt     parseInt  897 0998     console log  CleanInt     cleanInt  Infinity      ParseInt     parseInt  Infinity       result   CleanInt   NaN  ParseInt   NaN CleanInt   NaN  ParseInt   123 CleanInt   234  ParseInt   234 CleanInt   -679  ParseInt   -679 CleanInt   897  ParseInt   897 CleanInt   Infinity  ParseInt   NaN

User · Answer

You do not have to install something   parseInt req params year  10     should work properly   console log typeof parseInt req params year       returns  number    What is your output  if you use parseInt  is it still a string

[node.js] convert string to number node.js

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