---

FastAPI adalah *framework* *web* moderen, cepat (performa-tinggi) untuk membangun API dengan Python berdasarkan tipe petunjuk Python.

Fitur utama FastAPI:

* **Cepat**: Performa sangat tinggi, setara **NodeJS** dan **Go** (berkat Starlette dan Pydantic). [Salah satu *framework* Python tercepat yang ada](#performa).

```JSON
{"item_id":3}
```

/// check | Periksa

Perhatikan nilai fungsi yang diterima (dan dihasilkan) adalah `3`, sebagai `int` di Python, dan bukan string `"3"`.

Sehingga dengan deklarasi tipe data **FastAPI** memberikan request otomatis <abbr title="konversi string dari request HTTP menjadi data Python">"parsing"</abbr>.

///

## Validasi Data

import org.codelibs.core.exception.ParserConfigurationRuntimeException;
import org.codelibs.core.log.Logger;

/**
 * Utility class for {@link DocumentBuilderFactory}.
 *
 * @author higa
 */
public abstract class DocumentBuilderFactoryUtil {

    private static final Logger logger = Logger.getLogger(DocumentBuilderFactoryUtil.class);

    /**
     * Do not instantiate.
     */

import java.util.Map;

import org.codelibs.core.beans.BeanDesc;
import org.codelibs.core.beans.MethodDesc;
import org.codelibs.core.beans.factory.BeanDescFactory;

/**
 * Utility class for annotations.
 *
 * @author higa
 */
public abstract class AnnotationUtil {

    /**
     * Do not instantiate.
     */
    protected AnnotationUtil() {
    }

    /**

import org.codelibs.core.exception.ClIllegalStateException;
import org.codelibs.core.exception.NoSuchAlgorithmRuntimeException;

/**
 * Utility for handling {@link MessageDigest}.
 *
 * @author higa
 * @author shinsuke
 */
public abstract class MessageDigestUtil {

    /**
     * Do not instantiate.
     */
    protected MessageDigestUtil() {
    }

    /**

import org.codelibs.core.exception.InstantiationRuntimeException;
import org.codelibs.core.exception.InvocationTargetRuntimeException;

/**
 * Utility class for {@link Constructor} operations.
 *
 * @author higa
 */
public abstract class ConstructorUtil {

    /**
     * Do not instantiate.
     */
    protected ConstructorUtil() {
    }

    /**

 * governing permissions and limitations under the License.
 */
package org.codelibs.core.convert;

import java.math.BigInteger;

/**
 * Utility class for conversions related to {@link BigInteger}.
 *
 * @author higa
 */
public abstract class BigIntegerConversionUtil {

    /**
     * Do not instantiate.
     */
    protected BigIntegerConversionUtil() {
    }

    /**
     * Converts to {@link BigInteger}.

import java.text.SimpleDateFormat;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.text.DecimalFormatUtil;

/**
 * Utility class for conversions to {@link Long}.
 *
 * @author higa
 */
public abstract class LongConversionUtil {

    /**
     * Do not instantiate.
     */
    protected LongConversionUtil() {
    }

    /**
     * Converts the given object to a {@link Long}.

 */
package org.codelibs.core.misc;

import java.util.Locale;
import java.util.function.Supplier;

/**
 * Utility class for {@link Locale}.
 *
 * @author higa
 */
public abstract class LocaleUtil {

    /**
     * Do not instantiate.
     */
    protected LocaleUtil() {
    }

    /**
     * Returns a {@link Locale}.
     *
     * @param localeStr

import java.io.IOException;
import java.net.JarURLConnection;
import java.util.jar.JarFile;

import org.codelibs.core.exception.IORuntimeException;

/**
 * Utility class for {@link JarURLConnection}.
 *
 * @author higa
 */
public abstract class JarURLConnectionUtil {

    /**
     * Do not instantiate.
     */
    protected JarURLConnectionUtil() {
    }

    /**