My Simulator for Genshin Impact's probability driven Gacha Wish System

Visit the instructions on development setup

Frontend :

Backend API Calls :

• GET https://resyfer-genshin-wish-sim.herokuapp.com/api/v1/all : To view all items available through Gacha
• GET https://resyfer-genshin-wish-sim.herokuapp.com/api/v1/1/p5val/p5guar/p4val/p4guar/ : To make a 1 pull
• GET https://resyfer-genshin-wish-sim.herokuapp.com/api/v1/10/p5val/p5guar/p4val/p4guar/ : To make a 10 pull

p5val and p4val mean the pity in numbers with a range of 0-89 and 0-9 respectively.

p5guar and p4guar mean the guarantee rateup drop in numbers being either 1 for guarateed pity, 0 otherwise.

eg. https://resyfer-genshin-wish-sim.herokuapp.com/api/v1/10/85/1/5/0 means 5⭐ pity at 85 with a guaranteed rateup drop, and 4⭐ pity at 5 with no guarantee

NOTE: The current rates for the characters or items are for the banner Adrift In The Harbor

Rate-Ups :

• 5⭐ Characters : Ganyu
• 4⭐ Characters : Noelle, Xingqiu, Xiangling

Getting a 5⭐ character has a 0.6% chance (Ganyu has a 50% chance given it's a 5⭐), while getting a 4⭐ has a 5.1% chance (Noelle, Chongyun and Xiangling have a 50% chance total given it's a 4⭐, and they have an equal chance of occuring).

Moreover, there's a guaranteed 5⭐ in every 90 pulls from the previous 5⭐, and a guaranteed 4⭐ in every 10 pulls from the previous 4⭐. If, in the event of getting a 5⭐ or a 4⭐ that is not a rate-up character, the next 5⭐ or 4⭐ respectively and separately will be a guaranteed rate-up.

i) Clone the project, and install the dependencies

git clone https://github.com/resyfer/genshin-wish-simulator.git
cd genshin-wish-simulator
cd server && npm i
cd ..
cd client && npm i

ii) Environment Variables

Make a copy of .env.example and rename it as .env and enter your own MongoDB database below the existing content as:

MONGO_URI = YOUR_MONGODB_URL_HERE

iii) Run the project Open two terminal tabs and cd into the project in both

• Tab 1:

cd server
npm run dev

• Tab 2:

cd client
npm start

(Ask for .env from author if authorized)

• API
• Basic Frontend
• Decrease API req/res cycles, reducing response time (Issue #1)
• Game-like Front-end
• Include feature for selecting banners