cd into /api and npm install cd into /next-client and npm install

touch/api/.env

TOKEN_KEY="<your secret>"
DB_URL="mongodb://localhost:27017/<your db name>"

touch /next-client/.env.local

etc. *these constants do not refer to the nextjs /src/pages/api

REACT_APP_API_URL="<where api lives in production>"
REACT_APP_DEV_API_URL="http://localhost:3002/"
REACT_APP_CABLE_URL="<where cable lives in production>"
REACT_APP_DEV_CABLE_URL="http://localhost:8000"
REACT_APP_API2_URL="https://api.themoviedb.org/3/"
REACT_APP_DEV_API2_URL="https://api.themoviedb.org/3/"
REACT_APP_API2_KEY="<key you got from themoviedb.org>"
REACT_APP_API2_TOKEN="<token you got from themoviedb.org>"

root/api/src/db/seed_db.js like:

node ./api/src/db/seed_db.js