Here is what the console gives back :
curl -d "text=Hello world" -d "language=de-DE" https://languagetool.mydomain.com/v2/check
{"software":{"name":"LanguageTool","version":"6.2","buildDate":"2023-07-02 13:18:32 +0000","apiVersion":1,"premium":false,"premiumHint":"You might be missing errors only the Premium version can find. Contact us at support<at>languagetoolplus.com.","status":""},"warnings":{"incompleteResults":false},"language":{"name":"German (Germany)","code":"de-DE","detectedLanguage":{"name":"English (US)","code":"en-US","confidence":0.7122702,"source":"+fallback"}},"matches":[{"message":"Möglicher Tippfehler gefunden.","shortMessage":"Rechtschreibfehler","replacements":[{"value":"Hallo"},{"value":"Cello"},{"value":"Hell"},{"value":"Hella"},{"value":"Helle"},{"value":"Bello"},{"value":"Helgo"},{"value":"Hellt"},{"value":"FÀllt"},{"value":"Hall"},{"value":"Halle"},{"value":"FÀlle"},{"value":"HÀlt"},{"value":"Hellen"},{"value":"Fell"},{"value":"Heller"},{"value":"Held"},{"value":"Helm"},{"value":"Kelly"},{"value":"Welle","shortDescription":"Wasserwoge"}],"offset":0,"length":5,"context":{"text":"Hello world","offset":0,"length":5},"sentence":"Hello world","type":{"typeName":"UnknownWord"},"rule":{"id":"GERMAN_SPELLER_RULE","description":"Möglicher Rechtschreibfehler","issueType":"misspelling","category":{"id":"TYPOS","name":"Mögliche Tippfehler"}},"ignoreForIncompleteSentence":false,"contextForSureMatch":0},{"message":"Möglicher Tippfehler gefunden.","shortMessage":"Rechtschreibfehler","replacements":[{"value":"World"},{"value":"wollt"},{"value":"vorl."},{"value":"vorlud"},{"value":"wird"},{"value":"vor"},{"value":"wohl"},{"value":"wollte"},{"value":"wirkt"},{"value":"womit"},{"value":"sorgt"},{"value":"voll"},{"value":"volle"},{"value":"voran"},{"value":"vorne"},{"value":"Bord"},{"value":"Ford"},{"value":"Horst"},{"value":"Lord"},{"value":"Mord"}],"offset":6,"length":5,"context":{"text":"Hello world","offset":6,"length":5},"sentence":"Hello world","type":{"typeName":"UnknownWord"},"rule":{"id":"GERMAN_SPELLER_RULE","description":"Möglicher Rechtschreibfehler","issueType":"misspelling","category":{"id":"TYPOS","name":"Mögliche Tippfehler"}},"ignoreForIncompleteSentence":false,"contextForSureMatch":0}],"sentenceRanges":[[0,11]]}