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Schweizerische EidgenossenschaftConfédération suisseConfederazione SvizzeraConfederaziun svizraFederal Office for the Environment FOENOpen Data (OGD)

curl

The GraphQL endpoint is called via POST requests with a JSON body. No authentication is required.

Single query​

curl -X POST https://data.bafu.admin.ch/api \
  -H "Content-Type: application/json" \
  --data '{"query":"{ water { observations { stations(where:{status:{_eq:\"Aufgebaut\"}}, limit: 5) { no name riverName } } } }"}'

The response follows the GraphQL specification: a successful call contains a data object, a failed call an errors object.

Query from a file​

Longer queries are kept in a file and submitted with --data-binary. Line breaks and quoting are preserved.

cat > query.graphql <<'EOF'
{
  water {
    observations {
      data_1day_mean(
        where: {
          station: { no: { _eq: "2009" } }
          timestamp: { _gte: "2026-01-01T00:00:00Z", _lt: "2026-02-01T00:00:00Z" }
        }
      ) {
        timestamp
        parameterName
        value
        unitSymbol
      }
    }
  }
}
EOF

curl -X POST https://data.bafu.admin.ch/api \
  -H "Content-Type: application/json" \
  --data-binary "$(jq -Rs '{query: .}' < query.graphql)"

Query with variables​

curl -X POST https://data.bafu.admin.ch/api \
  -H "Content-Type: application/json" \
  --data @- <<'EOF'
{
  "query": "query DailyMean($from: AWSDateTime!, $to: AWSDateTime!, $station: String!) { water { observations { data_1day_mean(where: { station: { no: { _eq: $station } } timestamp: { _gte: $from, _lt: $to } }) { timestamp parameterName value unitSymbol } } } }",
  "variables": {
    "from": "2026-01-01T00:00:00Z",
    "to": "2026-02-01T00:00:00Z",
    "station": "2009"
  }
}
EOF

Notes​

  • The header Content-Type: application/json is required.
  • Double quotes inside the query string need escaping (\") when passed via --data '…'. The escaping is not needed when the query is read from a file.
  • HTTP status is 200 even for failed queries. The errors field in the response indicates problems.