Set mongodb document expiration from mongoose.

index.js

const mongoose = require('mongoose')

mongoose.connect('mongodb://localhost:27017/playground', {
  useNewUrlParser: true,
})

const catSchema = mongoose.Schema(
  {
    name: String,
    age: Number,
  },
  { timestamps: true },
)

catSchema.index({ createdAt: 1 }, { expireAfterSeconds: 15 })

const Cat = mongoose.model('Cat', catSchema)