Most formal way would be, Watashi wa Javan desu. Douzo, yoroshiku onegai shimasu. わたしわJavanです。どうぞ、よろしくおねがいします。 It literally means 'please be nice to me' but is roughly translated to 'pleased to meet you'

Wik is very incorrect. semi formal, good for most situations: (nice to meet you, i'm javan. i look forward to spending time with you.) はじめまして、ジャバンです。よろしくお願いします。 hajimemashite, jaban desu. yoroshikuonegaishimasu ^よろしくお願いします is impossible to translate directly but you have to say it when meeting someone new at the end of your introduction, and not more than once to the same person. very casual, with close friends (otherwise it's rude) ども、ジャバンです。よろしく。 domo, jaban desu. yoroshiku

i forgot to mention that saying "i" in japanese is gendered. "私" is for girls or for men if they are in a very formal setting, "僕" is for men in semi formal setting and also casual, "俺" is informal and only used with close friends or online.