Can I iterate over a big_map using Taquito?

Question

I have made a web interface for Tezos token interaction and now I would like to show a balance overview of the loaded tokens, i.e. show a list of address, account tuples . This requires me to be able to loop over the keys of a big_map. Is that possible using Taquito?

Looking at a token contract on the block explorer Better Call Dev they are able to show a balance overview, so I guess it should be possible in principle.

My storage is defined as

type account is record
    balance : nat;
    allowances: map(address, nat);
end

type storage is record
  ledger: big_map(address, account);
  total_supply: nat;
end

Answer 1

It is not possible using Taquito alone. You must use an indexer to extract all the key/value pairs from a big map (Better Call Dev is developed by Baking Bad who also offers an indexer API).
This will however be possible in the near future as Taquito will soon be able to plug into any indexer and extract all the values from a big map.