I have had a little bit of progress from the post here https://github.com/supabase/supabase/issues/491#issuecomment-871863896 However, for my code below,

js
const { createClient } = require('@supabase/supabase-js');

const access_token = "....." // I got this from my working React front end and validated the token from jwt.io, which can decode the token
const supabaseUrl = "https://......supabase.co"
const public_anon_key = "......"
const supabase = createClient(supabaseUrl,public_anon_key)

async function validateUser() {
        let {user, data, error} = await supabase.auth.api.getUser(access_token)
        console.log( {user, data, error})
}
validateUser()

I get

{
  user: null,
  data: null,
  error: { message: 'Invalid token: signature is invalid', status: 401 }
}

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You might also look into auth-helpers. https://github.com/supabase-community/supabase-auth-helpers

Fehmi (2022-05-01)