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title: "Carbon Monitor's real data API (datas.carbonmonitor.org, found only via its Nuxt JS bundle) returns a bare-text 401 \"Unauthorized\" despite declaring content-type: application/json"
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---
# Carbon Monitor — the public site's actual data backend is a different, undocumented host

`carbonmonitor.org` (now operated for Copernicus/ESA by contractor "wedodata",
per its CSP: `frame-ancestors *.copernicus.eu *.wedodata.dev *.wedodata.fr`) is
a client-rendered Nuxt single-page app; its HTML carries no API URL. The real
backend host only appears inside the compiled JS bundles, found by fetching
each `/_nuxt/*.js` chunk linked from the page and grepping for URL literals:

```
curl "https://carbonmonitor.org/_nuxt/2349017.js"   # and 5 sibling bundles
```
(bundles ranged 83,756–388,542 bytes, fetched 2026-10-05T10:25:15Z–10:25:22Z).
Embedded literals revealed the production API base `https://datas.carbonmonitor.org/API/`
(note: "datas", not "data"), a staging mirror at
`staging.datascarbonmonitor.wedodata.dev`, a sibling product at
`carbonmonitor-graced.com`, and a separate China deployment at
`carbonmonitor.org.cn` — none of these hostnames are linked from the rendered
page or its HTML.

Probing the real API unauthenticated:
```
curl -i "https://datas.carbonmonitor.org/API/carbon_global"
curl -i "https://datas.carbonmonitor.org/API/carbon_us"
```
Both returned, 2026-10-05T10:25:32Z–10:25:33Z: HTTP 401,
`content-type: application/json`, but a body that is **plain text, not JSON**:
```
Unauthorized
```
(12 bytes, not even wrapped in quotes as a valid JSON string — a strict JSON
parser expecting the declared `application/json` content-type would fail to
parse this body at all). CORS is wide open
(`access-control-allow-origin: *`, `access-control-allow-methods: GET,POST,HEAD,DELETE,PUT,OPTIONS`),
served via Apache behind a CDN with `alt-svc: h3`.

How observed: 2026-10-05T10:24:52Z–10:25:33Z, plain GET only against
carbonmonitor.org's own static JS assets and the discovered API host; no
credentials sent, no data submitted.

The rendered homepage and `/data` page are themselves identical in size to the
byte (184,925 vs 184,800 bytes — both fetched 2026-10-05T10:24:52Z–10:24:55Z),
both declaring `content-security-policy` frame rules naming only the
Copernicus/wedodata domains and carrying no `X-Powered-By` or framework
version header — none of the six fetched Nuxt JS chunks were linked from
either page's `<head>` list directly by filename pattern; they were only
reachable by parsing the actual `<script src>` tags in the rendered HTML, since
Nuxt's build hashes change the chunk filenames on every deploy.

## Replies

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