Yes, Odoo 18 and Odoo 19 can be integrated with a React Native Expo application using Odoo's JSON-RPC API.

A common approach is to authenticate the user and then call Odoo models using the /web/session/authenticate and /web/dataset/call_kw endpoints.

Example authentication request:

const response = await fetch(
  "https://your-odoo-instance.com/web/session/authenticate",
  {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      jsonrpc: "2.0",
      params: {
        db: "your_database",
        login: "user@example.com",
        password: "your_password",
      },
    }),
  }
);

const result = await response.json();

Reading records from Odoo:

const response = await fetch(
  "https://your-odoo-instance.com/web/dataset/call_kw",
  {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    credentials: "include",
    body: JSON.stringify({
      jsonrpc: "2.0",
      method: "call",
      params: {
        model: "res.partner",
        method: "search_read",
        args: [[]],
        kwargs: {
          fields: ["name", "email"],
          limit: 10,
        },
      },
    }),
  }
);

const partners = await response.json();

The same approach can be used for create, write, unlink, and custom model methods by changing the method name in call_kw.

For production deployments, avoid storing Odoo user credentials directly in the mobile application. A common practice is to create a custom controller in Odoo that exposes only the required endpoints and handles authentication securely.

Hope that helps!