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JSON to Java POJO Converter

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Paste JSON to generate Lombok-annotated Java classes

JSON to Java Advanced Guide

How to handle property naming?

Smart solutions:
1. CamelCase: user_id → userId
2. Keywords: Prefix with @ (e.g. @class)
3. Sanitization: Remove $/- symbols
4. Case preservation: Optional config
5. Lombok: @JsonProperty("original_name")

Correct date type mapping?

Multiple approaches:
1. ISO8601: LocalDateTime/LocalDate
2. Timestamps: Convert to Instant
3. Gson: @SerializedName + DateFormat
4. Jackson: @JsonFormat(pattern="yyyy-MM-dd")
5. Custom: Generate JsonDeserializer

Best practices for complex structures

Professional solutions:
1. Recursive generation: Inner classes for nesting
2. Generics: List> inference
3. Circular refs: @JsonIgnoreProperties(ignoreUnknown=true)
4. Polymorphism: Jackson @JsonTypeInfo
5. Optional: Java 8+ null safety

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JSON to Java POJO Converter

Instant Java POJO class generator from JSON. Supports nested objects, generic collections, and auto-generates Gson/Jackson annotations with Lombok integration. Handles date formats, circular references, and null safety.

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