cURL to Java Converter | Instant Spring Boot, WebClient & HttpClient Code

cURL to Java

Convert terminal commands to production code.

Code copied!

cURL to Java Converter – Convert cURL Commands to Java Code Instantly

Turn any cURL command into clean, ready-to-run Java code

Perfect for developers working with Spring Boot, HttpClient, WebClient, OkHttp, Retrofit, Java 11+ HttpClient, or any REST client in Java.

How It Works

This tool is designed to be the fastest way to translate your terminal commands into production-ready Java code. It runs entirely in your browser, ensuring speed and privacy.

  1. Input Parsing: When you paste your command, our engine uses a custom parser to break down the cURL string. It identifies the HTTP method (GET, POST, PUT), extracts headers (like Authorization or Content-Type), and isolates the JSON payload.
  2. Client Selection: You choose your target Java framework. Whether you need a modern curl to spring boot client conversion (using RestClient or WebClient) or a standalone curl command to java requestbuilder (using Java 11+ HttpClient), the tool adapts the syntax accordingly.
  3. Code Generation: The tool maps the extracted cURL components to the specific class structures and builder patterns of your chosen library, applying correct escaping for JSON strings and handling Basic Authentication automatically.
  4. Instant Export: The result is a clean, formatted Java snippet ready to be copied directly into your IDE.

Why Use Our cURL to Java Converter?

Manually converting cURL commands into Java code is annoying and error-prone.
This tool takes your raw cURL request and instantly generates Java code in the format you want — no setup, no plugins, no IDE extensions.

Supports multiple Java clients:

  • Java HttpClient (Java 11+)
  • OkHttp
  • Spring WebClient
  • RestTemplate
  • Apache HttpClient
  • Retrofit (experimental)

Supports all cURL features:

  • Headers
  • Query params
  • JSON body
  • Form-data
  • Multipart requests
  • Auth tokens
  • Cookies
  • File upload
  • Custom methods (PUT, PATCH, DELETE)

Who is this for?

  • Spring Boot developers
  • Java microservices teams
  • API testers
  • Backend engineers
  • Students learning Java HTTP clients

⚡ Features

✔ Parse any cURL command

Handles even complex multi-line cURL.

✔ Generate multiple Java styles

Choose Java HttpClient, WebClient, OkHttp, etc.

✔ Beautified + formatted code

Automatic indentation and escaping.

✔ Safe – everything stays in your browser

Multiple Java Clients Supported: The tool includes logic to generate code for four distinct Java HTTP clients:

  • Spring WebClient (Reactive/Async)
  • Spring RestClient (The modern Sync client in Spring Boot 3.2+)
  • Java 11 HttpClient (Native to the JDK)
  • OkHttp (Popular third-party library)

Parser Logic (Regex-based): The JavaScript function parseCurl(cmd) uses Regular Expressions to break down a raw cURL command. It extracts:

  • HTTP Method: (-X POST, etc.)
  • Headers: (-H "Content-Type:...")
  • Body/Data: (-d '{"json": "data"}')
  • Authentication: (-u user:pass maps to Basic Auth headers)

Modern UI/UX:

  • Responsive Grid: Adapts to mobile or desktop views.
  • CSS Variables: Uses :root for easy theming (currently set to a clean “Apple-style” light theme).
  • Interactive Elements: Includes a “Copy to Clipboard” button with a toast notification and a “Clear” button.

No server-side logging.

Input cURL:

curl -X POST https://api.example.com/v1/login \ -H “Content-Type: application/json” \ -d ‘{“email”: “user@test.com”, “password”: “123456”}’

Output (Java HttpClient):

HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://api.example.com/v1/login"))
    .header("Content-Type", "application/json")
    .POST(HttpRequest.BodyPublishers.ofString("{\"email\":\"user@test.com\",\"password\":\"123456\"}"))
    .build();

Frequently Asked Questions

1. What is a cURL to Java converter?

It converts a command-line cURL request into Java code so you can call the same API in your Java application.

2. Is this tool free?

Yes. 100% free.

3. Does it support file uploads or multipart?

Yes. It parses file upload cURLs and generates proper Java multipart code.

4. Will it support Kotlin?

Kotlin + Ktor output is planned.

5. How accurate is the conversion?

The parser handles headers, JSON, query params, multi-line, and complex flags.

6. Is my API key or sensitive data safe when I paste it here?

Yes. This tool operates 100% on the client side (in your browser). No data is ever sent to a backend server. Your API keys, tokens, and payloads remain on your machine and are processed locally via JavaScript.

7. Which Spring client should I choose?

It depends on your project’s architecture:

  • Choose Spring RestClient if you are using Spring Boot 3.2+ and prefer a modern, synchronous syntax.
  • Choose Spring WebClient if you are building a high-performance, non-blocking application (Reactive stack) or need to handle asynchronous streams.
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