How is API key rendered in Java?

The X-API-Key header (or any custom API-key header name) passes through unchanged to the generated code.

Can I redact the secret before sharing?

Yes. Open the Clean panel — Toolpaper detects Bearer tokens, Basic credentials, and common API-key patterns and replaces them with in a diffable view.

Does anything leave my browser?

No. Parsing, redaction, and generation are 100% client-side.

cURL with API key in Java

Paste a curl command that uses API key and get Java code using OkHttp. Toolpaper also detects secrets and offers a one-click redaction before sharing.

Quick answer

To convert a cURL command to Java, paste it into the Toolpaper workbench below. It parses the command in your browser and emits idiomatic Java code — headers, query string, request body, authentication (Bearer, Basic, API key), and cookies are all wired up automatically. No data is uploaded; conversion is fully client-side.

Prefer a different target? See the full cURL to Java reference, or jump to the same guide in JavaScript, Node.js, or Python.

InputcURL command

1 secret

MethodGET·Headers1·Body—· Chars 60

OutputJVM · OkHttp(modern JVM)

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class Main {
  public static void main(String[] args) throws Exception {
    OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder();
    clientBuilder.followRedirects(false).followSslRedirects(false);
    OkHttpClient client = clientBuilder.build();
    Request.Builder rb = new Request.Builder().url("https://api.example.com/me");
    rb.method("GET", null);
    rb.header("X-API-Key", "YOUR_KEY");
    try (Response response = client.newCall(rb.build()).execute()) {
      System.out.println(response.body().string());
    }
  }
}

Inspect

Example

A representative curl command for this scenario. Paste your own above to convert an exact match.

curl input

curl https://api.example.com/me \
  -H "X-API-Key: YOUR_KEY"

Implementation notes

The X-API-Key (or custom key header) name is preserved exactly as sent; case-sensitive gateways keep working.
Secrets are visible in the parsed request. Use the Clean panel's redact-and-diff flow before you paste the command anywhere.
Shareable links Base64-encode the input — they never leave your browser, and cleaned versions produce different links.

Common mistakes

Duplicating the key header (once via -H, once via a gateway middleware) — the generator warns when the same header appears twice.
Not rotating a leaked credential because "it's only in a screenshot" — screenshots get OCR'd, redact first.
Trusting HTTPS alone for API keys in query strings — proxies log URLs. Prefer headers, which the converter defaults to.

Common questions

How is API key rendered in Java?: The X-API-Key header (or any custom API-key header name) passes through unchanged to the generated code.
Can I redact the secret before sharing?: Yes. Open the Clean panel — Toolpaper detects Bearer tokens, Basic credentials, and common API-key patterns and replaces them with <REDACTED> in a diffable view.
Does anything leave my browser?: No. Parsing, redaction, and generation are 100% client-side.

More auth flows in Java

Java hub →

Bearer token in Java

/how-to/curl-bearer-auth-in-java

Basic auth in Java

/how-to/curl-basic-auth-in-java

The same guide in other languages

All guides →

In JavaScript

/how-to/curl-api-key-auth-in-javascript

In Node.js

/how-to/curl-api-key-auth-in-node

In Python

/how-to/curl-api-key-auth-in-python

In Go

/how-to/curl-api-key-auth-in-go

In PHP

/how-to/curl-api-key-auth-in-php

In Ruby

/how-to/curl-api-key-auth-in-ruby

In Rust

/how-to/curl-api-key-auth-in-rust

In Kotlin

/how-to/curl-api-key-auth-in-kotlin

Full Java reference on the cURL to Java hub, or open the main converter for all 18 targets.