Instagram API for Java

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class HikerApiExample {
    static final String API_KEY = "your_access_key";
    static final String BASE = "https://api.hikerapi.com";
    static final HttpClient client = HttpClient.newHttpClient();
    static final ObjectMapper mapper = new ObjectMapper();

    static JsonNode apiGet(String endpoint, String query)
            throws Exception {
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create(BASE + endpoint + "?" + query))
            .header("x-access-key", API_KEY)
            .build();
        HttpResponse<String> response = client.send(request,
            HttpResponse.BodyHandlers.ofString());
        return mapper.readTree(response.body());
    }

    public static void main(String[] args) throws Exception {
        JsonNode user = apiGet("/v1/user/by/username",
            "username=instagram");
        System.out.printf("Followers: %,d%n",
            user.get("follower_count").asLong());
    }
}

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.17.0</version>
</dependency>

@Service
public class InstagramService {
    private final RestTemplate rest = new RestTemplate();

    public JsonNode getUser(String username) {
        HttpHeaders headers = new HttpHeaders();
        headers.set("x-access-key", "your_access_key");
        String url = "https://api.hikerapi.com/v1/user/by/username"
            + "?username=" + username;
        return rest.exchange(url, HttpMethod.GET,
            new HttpEntity<>(headers), JsonNode.class).getBody();
    }
}