1. JSON Schema Third Party Auxiliary Tool

JSON Schema already has a number of third-party assistive tools based on different languages. You can see the instructions on the official website for details: http://json-schema.org/implementations . Among these third-party tools, we focus on the third-party tools available in the Java language. Currently, Java has the following third-party tools to choose from:

• json-schema-validator - supports version 4 (LGPLv3) - fge
• json-schema (implementation based on the org.json API) - supports version 4 (Apache License 2.0) - everit
• json-schema-validator - supports version 4 (Apache License 2.0) - networknt

In fact, three third-party tools, fge, everit and networknt, are quite different. Some people have done performance tests on them on the Internet. The specific address is as follows: https://github.com/networknt/json-schema-validator-perftest . Personally, I feel that this performance test is not the only reference standard for selecting tools. After all, when we choose a third-party tool, performance is only one of the considerations, not the only criterion that determines our choice. Moreover, I think it's better to combine application scenarios and use more targeted test data sources for targeted comparison and analysis, which is also more stable. Furthermore, we need to consider whether the error hints given by third-party tools are accurate and clear enough to understand when the JSON Schema validation fails.

2. Introduction to FGE tools

2.1 pom.xml file configuration

<!-- fge -->
<dependency>  
    <groupId>com.github.fge</groupId>  
    <artifactId>json-schema-validator</artifactId>  
    <version>2.2.6</version>    
</dependency>
<!-- fasterxml -->
<dependency>  
    <groupId>com.fasterxml.jackson.core</groupId>  
    <artifactId>jackson-core</artifactId>  
    <version>2.3.0</version>    
</dependency>  
<dependency>  
    <groupId>com.fasterxml.jackson.core</groupId>  
    <artifactId>jackson-databind</artifactId>  
    <version>2.3.0</version>    
</dependency>  

2.2 Code Example

public static void validateJsonByFgeByJsonNode(JsonNode jsonNode, JsonNode schemaNode){
    ProcessingReport report = null;
    report = JsonSchemaFactory.byDefault().getValidator().validateUnchecked(schemaNode, jsonNode);
    if (report.isSuccess()) {
        // Verification success
        System.out.println("Check success!");
    }else {
        System.out.println("Check failed!");
        Iterator<ProcessingMessage> it = report.iterator();
        while(it.hasNext()){
            System.out.println(it.next());
        }
    }
}

String json = "{\"foo\":1234}";
JsonNode jsonNode = JsonLoader.fromString(json);

String filePath = "src/test/resources/Test.json";
JsonNode jsonNode = null;
try {
    jsonNode = new JsonNodeReader().fromReader(new FileReader(filePath));
} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}