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const { Client, lookupPostcode } = require("@ideal-postcodes/core-node");

const client = new Client({ api_key: "iddqd" });

const addresses = await lookupPostcode({ client, postcode: "SW1A 2AA"});

addresses.forEach(a => console.log(`${a.line_1}, ${a.line_2}, ${a.post_town}`));


See the JavaScript Client documentation