kea-client
Typed Node.js client for the Kea DHCP Control Agent HTTP API

What this is

A thin, zero-dependency client for Kea DHCP's Control Agent HTTP command channel. Kea's API is a single-endpoint JSON command protocol (POST / with {command, service, arguments}), not a path-based REST API — this client wraps that protocol in typed, resource-grouped methods covering the general control commands and every command hook library ships (lease_cmds, host_cmds, subnet_cmds, class_cmds, stat_cmds, cb_cmds, ha). It does not manage the Kea process itself, nor the Control Agent's own configuration.

Installation

npm install @sourceregistry/kea-client

Also published unscoped as kea-client. Requires Node.js >= 18.

Quick Start

import { KeaClient } from "@sourceregistry/kea-client";

const client = new KeaClient({ baseUrl: "http://127.0.0.1:8000" });

const version = await client.control.getVersion();
console.log(version.extended);

// Target a specific daemon behind the Control Agent with a trailing `service` array.
const status = await client.control.getStatus(["dhcp4"]);
console.log(status);

await client.lease.setLease4(
  { "ip-address": "192.0.2.100", "hw-address": "1a:1b:1c:1d:1e:1f", "subnet-id": 1 },
  ["dhcp4"],
);

See /examples for full walkthroughs of every command group.

API

Every KeaClient method sends one Kea command and unwraps the first response entry, throwing KeaApiError if its result code is non-zero. The optional trailing service?: string[] argument on every method selects which daemon(s) the Control Agent forwards the command to (e.g. ["dhcp4"], ["dhcp6"], ["d2"]); omit it to let the Control Agent handle the command itself.

Resource	Hook / source	Example methods
client.control	general commands (built into every daemon)	getVersion, getStatus, getConfig, setConfig, testConfig, reloadConfig, writeConfig, listCommands, shutdown, getBuildReport, enableDhcp/disableDhcp, reclaimLeases, listInterfaces/addInterface/redetectInterfaces, testSubnet4Select/testSubnet6Select
client.lease	lease_cmds	setLease4/setLease6, getLease4/getLease6, getLease4ByHwAddress, getLease6ByDuid, updateLease4/updateLease6, delLease4/delLease6, wipeLease4/wipeLease6, getAllLeases4/getAllLeases6, getLease4Page/getLease6Page, bulkApplyLease6, resendLease4Ddns/resendLease6Ddns
client.host	host_cmds	setReservation, getReservation, getAllReservations, getReservationPage, getReservationByHostname, getReservationById, updateReservation, delReservation
client.subnet	subnet_cmds	setSubnet4/setSubnet6, getSubnet4/getSubnet6, updateSubnet4/updateSubnet6, listSubnets4/listSubnets6, delSubnet4/delSubnet6, setNetwork4/setNetwork6, getNetwork4/getNetwork6, listNetworks4/listNetworks6, addNetworkSubnet4/addNetworkSubnet6, delNetworkSubnet4/delNetworkSubnet6, delNetwork4/delNetwork6
client.class	class_cmds	setClass, updateClass, getClass, listClasses, delClass
client.stat	stat_cmds	getStatistic, getAllStatistics, resetStatistic/resetAllStatistics, removeStatistic/removeAllStatistics, setStatisticSampleAge/setAllStatisticsSampleAge, setStatisticSampleCount/setAllStatisticsSampleCount
client.configBackend	cb_cmds (remote-*)	setGlobalParameter4/get/getAll/del (+ 6), setServer4/get/getAll/del (+6), setRemoteNetwork4/get/list/del (+6), setRemoteSubnet4/get/list/delById/delByPrefix (+6), setOptionGlobal4/get/getAll/del, setOptionNetwork4/del, setOptionSubnet4/del, setOptionPool4/del, setOptionPdPool6/del, setOptionDef4/get/getAll/del (+6 for all option/def commands)
client.ha	ha (High Availability)	getHeartbeat, setScopes, continueSync, startMaintenance/cancelMaintenance, sync, notifySyncComplete

For commands issued against multiple service targets at once (e.g. ["dhcp4", "dhcp6"]), use client.sendRaw(command, args, service) — it returns every response entry without throwing on individual failures, since one target may succeed while another fails (Kea's partial-failure result: 5).

Error handling

import { KeaApiError, KeaTransportError } from "@sourceregistry/kea-client";

try {
  await client.lease.getLease4({ "ip-address": "192.0.2.100" }, ["dhcp4"]);
} catch (err) {
  if (err instanceof KeaApiError) {
    // err.result: 1 error, 2 unsupported, 3 not found, 4 conflict, 5 partial failure
    console.error(err.command, err.result, err.message);
  } else if (err instanceof KeaTransportError) {
    // non-2xx HTTP status or malformed response from the Control Agent itself
    console.error(err.statusCode, err.message);
  }
}

Options

new KeaClient({
  baseUrl: "http://127.0.0.1:8000", // required
  username: "admin",                 // optional, HTTP Basic Auth
  password: "secret",
  headers: { "x-request-id": "..." }, // optional, merged into every request
  timeoutMs: 10000,                    // optional, defaults to 10000
});

Development

See CONTRIBUTING.md for the branch/PR process, commit message conventions, and a checklist for adding new commands.

npm test              # vitest run
npm run test:ui        # vitest --ui
npm run test:coverage  # vitest run --coverage
npm run build           # tsc + vite build (+ JSR package assembly)
npm run docs:build      # typedoc -> generated/docs

Each file in /examples is runnable directly against a real Control Agent:

npm run examples/basic-status -- http://127.0.0.1:8000
# or: KEA_CA_URL=http://127.0.0.1:8000 npm run examples/leases

License

Apache-2.0. See LICENSE.