Install with npm install
Edit dec.js or hex.js to contain the string you want to search for
Run with npx dec.js or nxp hex.js
This Javascript code converts an ASCII string into a decimal number, then searches the digits of pi to find the index where the string representation can be found.
This Javascript code converts an ASCII string into a hex string, then searches the hexadecimal digits of pi to find the index where the hex string representation can be found.
You can use npx hex.js to determine that the string kf, with hexadecimal representation 0x6b66 can be found starting at the 31816th digit of pi in hexadecimal notation.
Note that every extra character you add to the search string increases the average search time by a factor of 256.