Manage vikanja tasks with curl

Delete tasks of a project

curl -s -H "Authorization: Bearer <TOKEN>" \
     "https://vikunja.whysthatso.net/api/v1/projects/18/tasks" \
| jq -r '.[].id' \
| xargs -I {} curl -s -X DELETE \
     -H "Authorization: Bearer <TOKEN>" \
     "https://vikunja.whysthatso.net/api/v1/tasks/{}"

Reassign tasks to another project

SOURCE_PROJECT_ID=3
TARGET_PROJECT_ID=1
API_TOKEN="<TOKEN>"
BASE_URL="https://vikunja.whysthatso.net/api/v1"

curl -s -H "Authorization: Bearer $API_TOKEN" \
     "$BASE_URL/projects/$SOURCE_PROJECT_ID/tasks" \
| jq -r '.[].id' \
| while IFS= read -r task_id; do
    if [ -n "$task_id" ]; then
      echo "Moving task $task_id -> project $TARGET_PROJECT_ID"
      curl -s --fail -X PUT \
           -H "Authorization: Bearer $API_TOKEN" \
           -H "Content-Type: application/json" \
           -d "{\"project_id\": $TARGET_PROJECT_ID}" \
           "$BASE_URL/tasks/$task_id" \
      || echo "  FAILED to move $task_id"
    fi
  done