.env

COMPANIES_HOUSE_API_KEY=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
COMPANIES_HOUSE_API_URL=https://api.companieshouse.gov.uk

README.md

Testing Companies House API

ATTENTION

The API keys do not work if you create an application in a development status. Make sure you create an app for production and then use that to generate API keys. It will save you a few hours tinkering with failed authentication responses.

index.js

import express from "express";
import cors from "cors";
import dotenv from "dotenv";

dotenv.config({ path: ".env" });

const companiesHouseApiUrl = process.env.COMPANIES_HOUSE_API_URL || "";
const companiesHouseApiKey = process.env.COMPANIES_HOUSE_API_KEY || "";

const searchNameInCompaniesHouse = async () => {
  const headers = new Headers();

  headers.set(
    "Authorization",
    `Basic ${Buffer.from(companiesHouseApiKey + ":").toString("base64")}`
  );

  return fetch(`${companiesHouseApiUrl}/search/companies?q=${name}`, {
    headers,
  }).then((response) => response.json());
};

const app = express();

app.use(cors());

app.get("/", (req, res) => {
  try {
    const companiesHouseResponse = await searchNameInCompaniesHouse(
      "Blucher Horses Limited"
    );

    res.status(200).json({
      companies: companiesHouseResponse,
    });
  } catch (err) {
    res.status(500).json({
      message: err?.message
    });
  }
});

app.listen(serverPort, () =>
  console.log('Server running on http://localhost:3000')
);