What's a good way to cache an API token for reuse?

[danechitoaie]

Using Vercel + Next.js with API routes where I need to pull data from an API that requires auth which returns a token that should be used until it expires, and then refresh it. Is there a way to cache this token so I don't need to also make the auth call on every request? This token needs to remain server side, to be used only by API routes so I can't cache it client side on the users cookie/local-storage/etc.

Anyone faced the same issue?

[cycle4passion]

Not an answer, but I can say I figured out you do not have ability to write to a file. I tried using node-persist. Maybe look for a similar package that keeps it in memory.

[styfle]

You could use a globally scoped variable in the API function like the following:

let token = ''

module.exports = async (req, res) => {
  if (!token) {
    token = await generateToken()
  }
  const result = await fetchData(token)
  res.send(result)
}

If you need to persist the token longer, then I would recommend Redis which can assign a TTL.

[danechitoaie]

Yeah, that's a good idea. I was thinking about redis, but might be an overkill and something like this might do the trick.

[roelvan]

Google secrets might be a solution too? They have a key rotation feature. But seems too complex for your needs :D

[ghost]

You can also try lambda.store which is serverless redis, and free tier can be enough for your usecase.