JavaScript无法正确编码和解码字符

Question

I have the below code that is decoding incorrectly.

btoa(atob("nirajan")) //Output: "nirajak="

but this below code works perfectly

btoa(atob("niranjan")) //Output: "niranjan"

Can somebody explain what is wrong with the first part and difference between the two code examples.

PS: Tested on Chrome

Answer 1

btoa() encodes the string and atob() decodes the string.

So you have your methods backwards. First, encode with btoa with the inner function, then, decode with atob on the outer function.

atob(btoa('Hello world!')); // returns 'Hello World!'