How to use the log/loginstance.LogInstance.info function in log

private onPostInventoryCosmetics(req: express.Request, res: express.Response, next: express.NextFunction): void {
    const reqUserId: number = Number(req.params.userId)
    const reqCosmetics: InventoryCosmetics = req.body

    LogInstance.info(`POST request to /users/${reqUserId}/inventory/cosmetics`)

    // return bad request if the userid or the body are invalid
    if (isNaN(reqUserId)
      || reqCosmetics.ctItem == null
      || reqCosmetics.terItem == null
      || reqCosmetics.headItem == null
      || reqCosmetics.gloveItem == null
      || reqCosmetics.backItem == null
      || reqCosmetics.stepsItem == null
      || reqCosmetics.cardItem == null
      || reqCosmetics.sprayItem == null) {
      return res.status(400).end()
    }

    /*if (cant find user) {
      return res.status(404).end()

private onGetInventory(req: express.Request, res: express.Response, next: express.NextFunction): void {
    const reqUserId: number = Number(req.params.userId)

    LogInstance.info(`GET request to /users/${reqUserId}/inventory`)

    // return bad request if the userid is invalid
    if (isNaN(reqUserId)) {
      return res.status(400).end()
    }

    /*if (cant find user) {
      return res.status(404).end()
    }*/

    const sampleResponse: InventoryItem[] = [
      {
        itemId: 100,
        ammount: 3,
      },
      {

private onGetInventoryCosmetics(req: express.Request, res: express.Response, next: express.NextFunction): void {
    const reqUserId: number = Number(req.params.userId)

    LogInstance.info(`GET request to /users/${reqUserId}/inventory/cosmetics`)

    // return bad request if the userid or the body are invalid
    if (isNaN(reqUserId)) {
      return res.status(400).end()
    }

    /*if (cant find user) {
      return res.status(404).end()
    }*/

    const sampleResponse: InventoryCosmetics = {
      ctItem: 1033,
      terItem: 1034,
      headItem: 10062,
      gloveItem: 30018,
      backItem: 20042,

private async setupDb(): Promise {
    const dbUri: string = formatMongoUri(process.env.DB_HOST,
      process.env.DB_PORT, process.env.DB_NAME)

    // create a mongo connection
    await mongoose.connect(dbUri, { useNewUrlParser: true, useUnifiedTopology: true })
    LogInstance.info('Connected to ' + dbUri + ' db sucessfully')

    // create global vars document
    await UserVars.initialize()
  }

private onDeleteInventory(req: express.Request, res: express.Response, next: express.NextFunction): void {
    const reqUserId: number = Number(req.params.userId)
    const reqItem: InventoryItem = req.body

    LogInstance.info(`DELETE request to /users/${reqUserId}/inventory`)

    // return bad request if the userid or the body are invalid
    if (isNaN(reqUserId)
      || reqItem.itemId == null
      || reqItem.ammount == null) {
      return res.status(400).end()
    }

    /*if (cant find user) {
      return res.status(404).end()
    }*/

    // return OK
    res.status(200).end()
  }

private onGetInventoryLoadout(req: express.Request, res: express.Response, next: express.NextFunction): void {
    const reqUserId: number = Number(req.params.userId)
    const reqLoadoutNum: number = Number(req.body.loadoutNum)

    LogInstance.info(`GET request to /users/${reqUserId}/inventory/loadout`)

    // return bad request if the userid or the body are invalid
    if (isNaN(reqUserId) || isNaN(reqLoadoutNum)) {
      return res.status(400).end()
    }

    /*if (cant find user) {
      return res.status(404).end()
    }*/

    const sampleResponse: InventoryLoadout = {
      loadoutNum: reqLoadoutNum,
      primary: 5218,
      secondary: 5288,
      melee: 84,
      hegrenade: 4,

private onPostInventoryLoadout(req: express.Request, res: express.Response, next: express.NextFunction): void {
    const reqUserId: number = Number(req.params.userId)
    const reqLoadout: InventoryLoadout = req.body

    LogInstance.info(`POST request to /users/${reqUserId}/inventory/loadout`)

    // return bad request if the userid or the body are invalid
    if (isNaN(reqUserId)
      || reqLoadout.loadoutNum == null
      || reqLoadout.primary == null
      || reqLoadout.secondary == null
      || reqLoadout.melee == null
      || reqLoadout.hegrenade == null
      || reqLoadout.flash == null
      || reqLoadout.smoke == null) {
      return res.status(400).end()
    }

    /*if (cant find user) {
      return res.status(404).end()
    }*/

private onPostInventoryBuyMenu(req: express.Request, res: express.Response, next: express.NextFunction): void {
    const reqUserId: number = Number(req.params.userId)
    const reqLoadout: InventorySubBuyMenu = req.body

    LogInstance.info(`POST request to /users/${reqUserId}/inventory/loadout`)

    // return bad request if the userid or the body are invalid
    if (isNaN(reqUserId)
      || reqLoadout.index == null
      || reqLoadout.weapons == null) {
      return res.status(400).end()
    }

    /*if (cant find user) {
      return res.status(404).end()
    }*/

    // return OK
    res.status(200).end()
  }
}

public async listen(): Promise {
    await this.setupDb()

    this.server = this.app.listen(this.app.get('port'))
    LogInstance.info('Started user service')
    LogInstance.info('Listening at ' + this.app.get('port'))
  }

public async listen(): Promise {
    await this.setupDb()

    this.server = this.app.listen(this.app.get('port'))
    LogInstance.info('Started user service')
    LogInstance.info('Listening at ' + this.app.get('port'))
  }