This article shows how to pretty print JSON with JSON.simple. Table of contents: 1. Setup JSON.simple 2. Default Compact Print JSON 3. Pretty Print JSON with JSON.simple 4. Write Pretty Print JSON to a File 5. Download Source Code 6. References P.S Tested with json-simple 4.0.1 1. Setup JSON.simple pom.xml <dependency> <groupId>com.github.cliftonlabs</groupId> <artifactId>json-simple</artifactId> <version>4.0.1</version> </dependency> […]
In GSON, we can use the transient keyword, ExclusionStrategy, and @Expose to exclude fields during the JSON serialization or deserialization process. Table of contents: 1. Setup Google Gson 2. Using the "transient" Keyword 3. Using the "ExclusionStrategy" 4. Using the "ExclusionStrategy" and custom annotation 5. Using the @Expose annotation 6. Download Source Code 7. References […]
Gson does not directly support Java 8’s date-time APIs like LocalDate, LocalDateTime, and ZonedDateTime. However, we can create a custom JSON serializer to support Java 8 date-time types. This article shows how to use Gson to handle the LocalDate type. Table of contents: 1. Setup Google Gson 2. Default, Gson does not support Java 8 […]
When the JSON field name doesn’t exactly match the Java object field names, we can use @SerializedName to change the JSON’s matching field name in Gson. Table of contents: 1. Setup Google Gson 2. JSON Unrecognized Field 3. Custom field name with @SerializedName 4. Download Source Code 5. References P.S Tested with Gson 2.10.1 1. […]
This article shows how to use Gson to write a Java object to a JSON file and read that JSON file back into a Java object. Table of contents: 1. Download Google Gson 2. A Java Object 3. Write Java object to JSON file using Gson 4. Read JSON from a file using Gson 5. […]
This article shows how to create a Jackson custom serializer and deserializer to parse JSON data that contains a LocalDate type. The Jackson custom serializer or deserializer is useful when we want to process a specific format that is not the default. Table of contents: 1. Setup Jackson 2. Jackson Custom Serializer for LocalDate 3. […]
When the JSON field name doesn’t exactly match the Java field names, we can use @JsonProperty to change the name of a JSON field in Jackson. Table of contents: 1. Setup Jackson 2. JSON Unrecognized field 3. Custom field name with @JsonProperty 4. Download Source Code 5. References P.S Tested with Jackson 2.17.0 1. Setup […]
This article shows how to use Moshi’s JsonAdaptor indent method to enable the pretty print JSON. Table of contents: 1. Download Moshi 2. Compact print JSON (Default) 3. Pretty print JSON using Moshi 4. Download Source Code 5. References P.S Tested with Moshi 1.15.1 1. Download Moshi Declare moshi in the pom.xml. pom.xml <dependency> <groupId>com.squareup.moshi</groupId> […]
This article shows how to write JSON to a file using Moshi. Table of contents: 1. Download Moshi 2. Write JSON to a file using Moshi 3. Read JSON from a file using Moshi 4. Download Source Code 6. References P.S Tested with Moshi 1.15.1 1. Download Moshi Declare moshi in the pom.xml. pom.xml <dependency> […]
This article shows how to parse JSON using Moshi. Table of contents: 1. Download Moshi 2. Parse JSON using Moshi 3. Parse JSON Array using Moshi 4. Convert Java Object to JSON String 5. Download Source Code 6. References P.S Tested with Moshi 1.15.1 1. Download Moshi Declare moshi in the pom.xml, and it will […]
This article shows how to use Jackson and Lombok together. Table of contents: 1. Download Jackson and Lombok 2. Model with Lombok annotations 3. Parse JSON using Jackson 5. Download Source Code 6. References P.S Tested with Jackson 2.17.0 and Lombok 1.18.32 1. Download Jackson and Lombok Declares jackson-databind and lombok at pom.xml. pom.xml <dependency> […]
This article shows how to map a subset of a JSON file using Jackson. Table of contents: 1. Download Jackson 2. Map a subset of a JSON file 3. Define Java Classes that reflect JSON structure 4. Ignoring Unneeded Fields with Jackson 5. Testing the subset of JSON using Jackson 6. Download Source Code 7. […]
This article will show you how to convert Java objects to JSON with Jackson. Table of contents: 1. Setup Jackson 2. Jackson quick examples 3. Convert Java Object to JSON using Jackson 4. Convert JSON to Java object using Jackson 5. Write Java object to JSON file 6. Read from JSON file to Java object […]
In Jackson, we can use @JsonIgnore to ignore a single field, @JsonIgnoreProperties to ignore multiple fields and @JsonIgnoreType to ignore a specified type during JSON serialization and deserialization. Table of contents: 1. Setup Jackson 2. Jackson @JsonIgnore – Ignores a field 3. Jackson @JsonIgnoreProperties – Ignores multiple fields 4. Jackson @JsonIgnoreType – Ignores a specified […]
This article shows how Jackson can support the Java 8 date time APIs or JSR-310. Table of contents: 1. Download Jackson 2. Jackson does not support Java 8 date time APIs 3. Make Jackson support Java 8 date time APIs or JSR310 3.1 jackson-datatype-jsr310 3.1 Register JavaTimeModule() 4. Download Source Code 5. References P.S Tested […]
This article shows 3 methods or tools to make JSON output easier to read, or "pretty print" the JSON after receiving it with cURL requests. Table of contents: 1. Pretty print JSON with jq 2. Pretty print JSON with json_pp 3. Pretty print JSON with Python 4. References In the default cURL requests, the JSON […]
This article shows how to parse JSON Array using Gson. Table of contents: 1. Download Google Gson 2. Parse JSON Array using Gson 3. Parse JSON Array of Object Array using Gson 4. JSON array contains array of object 5. Unusual JSON array contains array of string 6. Download Source Code 7. References P.S Tested […]
In Jackson, we can use the annotation @JsonView to control which fields of the same resource are displayed for different users. Table of contents: 1. Download Jackson 2. Define View Classes 3. Annotate model class with @JsonView 4. Testing the Jackson @JasonView 5. Download Source Code 6. References P.S Tested with Jackson 2.17.0 1. Download […]
This article uses the Jackson framework to parse JSON strings in Java. Table of contents: 1. Download Jackson 2. Parse JSON String with Jackson 3. Parse JSON Array with Jackson 4. Convert Java Object to JSON String 5. Convert JSON String to Java Object 6. Download Source Code 7. References P.S Tested with Jackson 2.17.0 […]
In Jackson, we can use @JsonInclude(JsonInclude.Include.NON_NULL) to ignore the null fields during serialization. Table of contents: 1. Jackson default include null fields 2. Ignore all null fields globally 3. Ignore null fields (Class Level) 4. Ignore null fields (Field Level) 5. Download Source Code 6. References P.S Tested with Jackson 2.17.0 1. Jackson default include […]
This article uses the Jackson framework to parse JSON Array in Java. Table of contents: 1. Download Jackson 2. Parse JSON Array with Jackson 3. Convert List of Objects to JSON Array 4. Write JSON Array with a list label 5. Parse JSON Array contains a list label 6. Download Source Code 7. References P.S […]
This article shows how to parse JSON using Gson. Table of contents: 1. Download Google Gson 2. A Java Object 3. Parse JSON String using Gson 4. Parse JSON Array using Gson 5. Convert Java Object to JSON using Gson 6. Unstructured JSON 7. Download Source Code 8. References P.S Tested with Gson 2.10.1 1. […]
Java JSON Tutorials with full example, including how to read, write JSON with Jackson, Gson and JSON.simple frameworks.
This article uses the Jackson framework to parse JSON strings to a Map in Java. Table of contents: 1. Download Jackson 2. Convert JSON string to Map 3. Convert Map to JSON string 4. Download Source Code 5. References P.S Tested with Jackson 2.17.0 1. Download Jackson Simply declare jackson-databind in the pom.xml, and it […]
This article shows how to read and write JSON using JSON.simple. Table of contents: 1. Setup JSON.simple 2. Write JSON to File using JSON.simple 3. Read JSON from File using JSON.simple 4. Java object to JSON using JSON.simple 5. JSON to Java Object using JSON.simple 6. Download Source Code 7. References P.S Tested with json-simple […]
Streaming APIs are efficient ways of processing large JSON files or data without loading the entire document into memory. Gson provides JsonReader and JsonWriter classes for JSON streaming. Gson’s Streaming API JsonWriter – Write JSON as a stream. JsonReader – Read JSON as a stream. Table of contents: 1. Setup Google Gson 1. Write JSON […]
This article shows how to use Jackson’s Streaming API for both reading from and writing to JSON. Jackson’s Streaming API JsonGenerator – Write JSON data JsonParser – Read and Parse JSON data Table of contents: 1. Download Jackson 2. Write JSON using JsonGenerator 2. Write JSON Array using JsonGenerator 3. Read JSON using JsonParser 4. […]
Jackson’s Tree Model provides a flexible way to work with JSON data compared to the data-binding method. The Tree Model works well when the JSON data or JSON’s schema is unknown until runtime or the JSON structure does not map properly to Java classes. This article shows how to use Jackson’s Tree Model JsonNode and […]
In Jackson, we can use writerWithDefaultPrettyPrinter() to pretty print the JSON strings. Table of contents: 1. Setup Jackson 2. Compact print JSON (Default) 3. Pretty print JSON with Jackson 4. Pretty print JSON with Jackson (Globally) 5. Download Source Code 6. References P.S Tested with Jackson 2.17.0 1. Setup Jackson Puts jackson-databind at pom.xml. pom.xml […]
This article shows how to pretty print JSON using Gson. Table of contents: 1. Setup Google Gson 2. Default Compact Print JSON 3. Pretty Print JSON using Gson 4. Download Source Code 5. References P.S Tested with Gson 2.10.1 1. Setup Google Gson Declare gson in the pom.xml. pom.xml <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.10.1</version> </dependency> 2. […]
This article shows how to convert Java objects to from JSON using Gson. Table of contents: 1. Download Google Gson 2. Gson Basic Usages 3. Java Object 4. Convert Object to JSON using Gson 5. Converts JSON to Java Object using Gson 6. Modify JSON with JsonElement 7. Converts Json Array to List objects 8. […]
