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@ideal-postcodes/core-node v1.2.0

Node.js client for

Ideal Postcodes Node.js

Node.js client for

CircleCI codecov Dependency Status npm version install size

@ideal-postcodes/core-node is the Node.js client for

Our JavaScript client implements a common interface defined at @ideal-postcodes/core-interface.

High level client documentation can be found at core-interface.

In depth client documentation can be found at

@ideal-postcodes/core-node is tested against all maintained, stable releases.


Other JavaScript Clients


Configuration & Usage


npm install @ideal-postcodes/core-node


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

// or, if applicable,
import { Client } from "@ideal-postcodes/core-node"

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

Configuration options


const addresses = await client.lookupPostcode({ postcode: "SW1A2AA" });

Catch Errors

const { IdpcRequestFailedError } = Client.errors;

try {
  await client.lookupAddress({ query: "10 downing street" });
} catch (error) {
  if (error instanceof IdpcRequestFailedError) {
    // IdpcRequestFailedError indicates a 402 response code
    // Possibly the key balance has been depleted

Configure HTTP Agent

core-node uses got as its underlying HTTP client. The Ideal Postcodes API client can also be optionally configured with a got options object which is fed to got on every request.

Be aware this options object will overwrite any existing got HTTP request parameters.

const client = new Client({ api_key: "iddqd" }, {
  cache: new Map, // Instantiate a cache:
  hooks: {        // Hook into HTTP responses:
    afterResponse: response => {
      return response;
Proxy HTTP Requests

You can proxy requests by configuring the underlying got HTTP client.

const tunnel = require("tunnel");

const client = new Client(config, {
  agent: tunnel.httpOverHttp({
    proxy: {
      host: "localhost"


The client exposes a number of simple methods to get at the most common tasks when interacting with the API. Below is a (incomplete) list of commonly used methods.

For a complete list of client methods, including low level resource methods, please see the core-interface documentation

Lookup a Postcode

Return addresses associated with a given postcode

const postcode = "id11qd";

const addresses = await client.lookupPostcode({ postcode });

Method options

Search for an Address

Return addresses associated with a given query

const query = "10 downing street sw1a";

const addresses = await client.lookupAddress({ query });

Method options

Search for an Address by UDPRN

Return address for a given udprn

Invalid UDPRN will return null

const udprn = 23747771;

const address = await client.lookupUdprn({ udprn });

Method options


npm test



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