A reference implementation of a JSON package in Java.
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README.md

JSON in Java [package org.json]

Maven Central

JSON is a light-weight, language independent, data interchange format. See http://www.JSON.org/

The files in this package implement JSON encoders/decoders in Java. It also includes the capability to convert between JSON and XML, HTTP headers, Cookies, and CDL.

This is a reference implementation. There is a large number of JSON packages in Java. Perhaps someday the Java community will standardize on one. Until then, choose carefully.

The license includes this restriction: "The software shall be used for good, not evil." If your conscience cannot live with that, then choose a different package.

The package compiles on Java 1.6-1.8.

JSONObject.java: The JSONObject can parse text from a String or a JSONTokener to produce a map-like object. The object provides methods for manipulating its contents, and for producing a JSON compliant object serialization.

JSONArray.java: The JSONArray can parse text from a String or a JSONTokener to produce a vector-like object. The object provides methods for manipulating its contents, and for producing a JSON compliant array serialization.

JSONTokener.java: The JSONTokener breaks a text into a sequence of individual tokens. It can be constructed from a String, Reader, or InputStream.

JSONException.java: The JSONException is the standard exception type thrown by this package.

JSONPointer.java: Implementation of JSON Pointer (RFC 6901). Supports JSON Pointers both in the form of string representation and URI fragment representation.

JSONPropertyIgnore.java: Annotation class that can be used on Java Bean getter methods. When used on a bean method that would normally be serialized into a JSONObject, it overrides the getter-to-key-name logic and forces the property to be excluded from the resulting JSONObject.

JSONPropertyName.java: Annotation class that can be used on Java Bean getter methods. When used on a bean method that would normally be serialized into a JSONObject, it overrides the getter-to-key-name logic and uses the value of the annotation. The Bean processor will look through the class hierarchy. This means you can use the annotation on a base class or interface and the value of the annotation will be used even if the getter is overridden in a child class.

JSONString.java: The JSONString interface requires a toJSONString method, allowing an object to provide its own serialization.

JSONStringer.java: The JSONStringer provides a convenient facility for building JSON strings.

JSONWriter.java: The JSONWriter provides a convenient facility for building JSON text through a writer.

CDL.java: CDL provides support for converting between JSON and comma delimited lists.

Cookie.java: Cookie provides support for converting between JSON and cookies.

CookieList.java: CookieList provides support for converting between JSON and cookie lists.

HTTP.java: HTTP provides support for converting between JSON and HTTP headers.

HTTPTokener.java: HTTPTokener extends JSONTokener for parsing HTTP headers.

XML.java: XML provides support for converting between JSON and XML.

JSONML.java: JSONML provides support for converting between JSONML and XML.

XMLTokener.java: XMLTokener extends JSONTokener for parsing XML text.

Unit tests are maintained in a separate project. Contributing developers can test JSON-java pull requests with the code in this project: https://github.com/stleary/JSON-Java-unit-test

Numeric types in this package comply with ECMA-404: The JSON Data Interchange Format and RFC 7159: The JavaScript Object Notation (JSON) Data Interchange Format. This package fully supports Integer, Long, and Double Java types. Partial support for BigInteger and BigDecimal values in JSONObject and JSONArray objects is provided in the form of get(), opt(), and put() API methods.

Although 1.6 compatibility is currently supported, it is not a project goal and may be removed in some future release.

In compliance with RFC7159 page 10 section 9, the parser is more lax with what is valid JSON than the Generator. For Example, the tab character (U+0009) is allowed when reading JSON Text strings, but when output by the Generator, tab is properly converted to \t in the string. Other instances may occur where reading invalid JSON text does not cause an error to be generated. Malformed JSON Texts such as missing end " (quote) on strings or invalid number formats (1.2e6.3) will cause errors as such documents can not be read reliably.

Release history:

20180813    POM change to include Automatic-Module-Name (#431)

20180130    Recent commits

20171018    Checkpoint for recent commits.

20170516    Roll up recent commits.

20160810    Revert code that was breaking opt*() methods.

20160807    This release contains a bug in the JSONObject.opt*() and JSONArray.opt*() methods,
it is not recommended for use.
Java 1.6 compatability fixed, JSONArray.toList() and JSONObject.toMap(),
RFC4180 compatibility, JSONPointer, some exception fixes, optional XML type conversion.
Contains the latest code as of 7 Aug, 2016

20160212    Java 1.6 compatibility, OSGi bundle. Contains the latest code as of 12 Feb, 2016.

20151123    JSONObject and JSONArray initialization with generics. Contains the
latest code as of 23 Nov, 2015.

20150729    Checkpoint for Maven central repository release. Contains the latest code
as of 29 July, 2015.

JSON-java releases can be found by searching the Maven repository for groupId "org.json" and artifactId "json". For example: https://search.maven.org/search?q=g:org.json%20AND%20a:json&core=gav