HK Data API

香港開放數據 · HK OPEN DATA API

All of Hong Kong's open data,
one clean API.

A unified, JSON-only REST API over data.gov.hk — datasets, transport, weather and historical archives. Passkey auth, edge caching, generous quotas.

Get an API key →Read the docs

No passwords. Passkey sign-in. Free during beta.

GET /data/weather200 · 42ms · hkg
# authenticate with your api key
curl https://data.anka.dev/data/weather \
-H "Authorization: Bearer hkda_••••" \
-H "Accept-Language: en"
200 OK · cache HIT · edge · hkg
{
"id": "hko-current-weather",
"forecast": "Mainly cloudy",
"temperature": 27,
"humidity": 82
}
332
datasets
19
categories
6,300+
resources
100%
json responses

The problem

data.gov.hk wasn't built for apps.

Two disjoint API systems, CSV and XML everywhere, redirects instead of data, and no auth. HK Data API normalises all of it into one predictable JSON surface.

Raw data.gov.hk

  • CKAN envelope { help, success, result }
  • CSV / XML returned by default
  • 302 redirects instead of inline data
  • No auth, no rate limits, no quotas
  • Language baked into the URL path

HK Data API

  • Standard JSON for every response
  • Unified errors, pagination & metadata
  • Passkey auth + revocable API keys
  • Rate limits and monthly quotas
  • Status code is the signal — no wrapper

Coverage

Every category. One endpoint style.

01

Transport

  • /data/transport/mtr
  • /data/transport/bus/kmb
  • /data/transport/parking
02

Weather

  • /data/weather
  • warnings
  • climate
03

Geography

  • /data/address
  • /data/city/lamp-posts
  • historical maps
04

Civic

  • /data/schools
  • /data/holidays
  • public records
05

Historical

  • /data/historical
  • versioned files
  • schemas
06

Everything else

  • /datasets
  • /categories
  • 6,300+ resources

Get started

From zero to first request in a minute.

01 — REGISTER

Create an account with a passkey

WebAuthn sign-in — no passwords, no email codes. Your device is the key.

02 — KEY

Generate an API key

A long-lived hkda_… token you can name, rotate and revoke from the portal.

03 — CALL

Send your first request

Authenticate with Bearer and unlock registered-tier limits instantly.

Limits

Anonymous works. A key unlocks more.

TierRate limitMonthly
Anonymous30 / min1,000
Registered300 / min100,000
# create a key in the portal, then:
curl https://data.anka.dev/data/transport/mtr \
-H "Authorization: Bearer hkda_••••"
GET /datasets?category=transport
→ 200 OK · X-RateLimit-Limit: 300

FAQ

Questions, answered.

What is HK Data API?

A unified RESTful JSON API wrapper over data.gov.hk, Hong Kong's open data portal. It normalises the catalogue and data APIs into one predictable JSON surface with auth, rate limits and quotas.

What data is available?

332 datasets across 19 categories — transport (MTR, KMB buses, parking, traffic cameras), weather and climate, census statistics, property and land registry, water quality, legislation and historical archives.

Is HK Data API free?

Yes — free during beta. Anonymous requests work at lower limits, and a free API key unlocks registered-tier quotas (300 requests/minute, 100,000/month).

How do I authenticate?

Register with a passkey (WebAuthn) — no passwords — then generate a Bearer API key from the portal. Your device is the key.

Is the data real-time?

Transport data is: MTR and KMB bus ETAs update around once a minute and traffic camera snapshots refresh continuously. Other datasets are cached per each source's update frequency.

How do I get started?

Register with a passkey, create an API key, then send a Bearer-authenticated request. Full examples are in the documentation.

Start building on Hong Kong's data.

Register with a passkey, generate an API key, and ship. No credit card, no waiting.

Get an API key →