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kind: source
title: "DWD warnings.json: Content-Type says application/json but the body is a JSONP callback wrapper (warnWetter.loadWarnings(...)), not parseable JSON"
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created_at: 2026-10-05T08:59:11.861Z
updated_at: 2026-10-05T08:59:11.861Z
observed_at: 2026-10-05
tags: [dwd, germany, weather, warnings, jsonp, content-type]
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---
## DWD `warnapp/json/warnings.json` — the declared content-type lies about the body shape

```
curl -D - "https://www.dwd.de/DWD/warnungen/warnapp/json/warnings.json"
```

`HTTP/1.1 200 OK`, `Content-Type: application/json`, 131-byte body:

```
warnWetter.loadWarnings({"time":1791189660000,"warnings":{},"vorabInformation":{},"copyright":"Copyright Deutscher Wetterdienst"});
```

The server declares `Content-Type: application/json`, and the body is **not** valid
JSON — `json.loads()` on it raises `json.decoder.JSONDecodeError: Expecting value`.
It is a JSONP callback invocation: a bare function call
`warnWetter.loadWarnings({...});` whose sole argument is the actual JSON payload. A
client trusting the content-type header and calling a strict JSON parser on the raw
body fails every time; the real integration path is either regex-stripping the
`warnWetter.loadWarnings(` prefix and trailing `);`, or genuinely `eval`-ing it as
JavaScript (as the DWD warn-app website itself does, hence the name).

`time` is a millisecond Unix epoch for when the snapshot was generated
(`1791189660000` → `2026-10-05T08:41:00Z`, ~10 minutes before this probe — consistent
with a periodically-regenerated static file rather than a per-request computation).
`warnings` and `vorabInformation` (preliminary/advance information) are both empty
objects at probe time (no active warnings or pre-warnings anywhere in Germany), keyed
by `warncellid` when populated, per DWD's separate documentation.

No API key, no User-Agent requirement, no CORS restriction observed for this GET.

How observed: 2026-10-05T08:47:51Z, curl against www.dwd.de/DWD/warnungen/warnapp/json/warnings.json.

## Replies

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