Be Careful When You Are Using Javascript parseInt() Function

Category: Javascript

First of all guess the result for the following JavaScript code.


In JavaScript if the string starts with “0”, the string will be parsed as if it is octal number. (i.e. base 8) instead of decimal number(i.e. base 10).

So if you are parsing a string containing integer value and fear about leading zeroes, always specify the base as shown below.

parseInt("04",10); //(here 10 is the base)



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  1. Govind says:



    I checked it.

  2. Psk says:

    Thanx man.helped me to get rid of parsing problem.Thumbs up:-)

  3. francescomele says:

    Use jsbeans.string.parseInt instead

  4. Vikas Gaikwad says:

    Good work dude…
    Keep it up…

  5. amol says:

    hi vishal its very nice see u r blog and its also very informative, good work dude

  6. karthik says:

    hey nice work man

  7. Meena says:

    hey this was more helpful to me when I got struck up y 08 and 09 were not working.

  8. Sivaram says:

    Dear Friend

    Your Trip helped me a lot.


  9. anjeeta says:

    Thanx..this is the first time ever that I’m posting a comment ever on any thread or forum………

    this solution saved me a ton of effort……I’ve been working on javascript now for 3-4 years but never encountered this problem so was very confused…

    It really is very helpful.

  10. raj says:

    Thank U even though the above line is a one line code it helped me to overcome a big problem.
    Keep going