Convert cURL to Java

How cURL to Java works

The Java output uses HttpRequest.newBuilder() — URI, method, headers and body publishers map one-to-one from the cURL flags. JSON bodies use HttpRequest.BodyPublishers.ofString with Content-Type application/json, urlencoded bodies build a query string with URLEncoder.encode, and multipart bodies need a manual boundary writer (or the converter recommends Apache HttpClient 5 for heavy multipart use). Responses are read via HttpResponse.BodyHandlers.ofString and parsed with Jackson or Gson at the call site.

Java code example

Realistic GET + POST with headers and a JSON body, written using java.net.http.HttpClient.

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;

public class Example {
    public static void main(String[] args) throws Exception {
        HttpClient client = HttpClient.newBuilder()
            .connectTimeout(Duration.ofSeconds(30))
            .build();

        // GET with headers and query params
        HttpRequest getReq = HttpRequest.newBuilder()
            .uri(URI.create("https://api.example.com/users?page=1&limit=50"))
            .header("Authorization", "Bearer YOUR_TOKEN")
            .header("User-Agent", "MyApp/1.0")
            .GET()
            .build();
        HttpResponse<String> getResp = client.send(getReq, HttpResponse.BodyHandlers.ofString());
        System.out.println(getResp.statusCode() + " " + getResp.body());

        // POST with JSON body
        String payload = "{\"name\":\"Ada Lovelace\",\"email\":\"[email protected]\"}";
        HttpRequest postReq = HttpRequest.newBuilder()
            .uri(URI.create("https://api.example.com/users"))
            .header("Authorization", "Bearer YOUR_TOKEN")
            .header("Content-Type", "application/json")
            .POST(HttpRequest.BodyPublishers.ofString(payload))
            .build();
        HttpResponse<String> postResp = client.send(postReq, HttpResponse.BodyHandlers.ofString());
        System.out.println(postResp.statusCode());
    }
}

cURL to Java — FAQ

Convert to other languages

Need the same cURL command in a different language? Use one of these converters:

• cURL to Python
• cURL to JavaScript (fetch)
• cURL to Node.js
• cURL to PHP
• cURL to Go
• cURL to C#
• cURL to Ruby