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JSON to Java Class

Generate Java POJOs or records with Jackson annotations from JSON.

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Annotations come from Jackson — add jackson-databind to your build, or delete them if your keys already match the field names.

Quick Tool Overview

The JSON to Java Class converter generates POJOs with Jackson annotations, private fields and full accessors — or modern Java records, which collapse the same model into a single declaration.

What it does
Generates Java POJOs or records from a JSON sample
You give it
A JSON payload, ideally an array of records
You get back
Jackson-annotated classes or records
Best for
Spring Boot clients and any Jackson-based deserialisation
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About the JSON to Java Class

Paste a payload and get the Java model: private fields with Jackson's JsonProperty annotation preserving the original key, a getter and setter for each, List<T> for arrays and a class for every nested object.

If you are on Java 17 or later there is a record mode, which collapses the whole class to a single declaration with the components annotated inline — far less code for a type that only carries data. Either way the primitives are boxed where a field can be absent, because a primitive long cannot represent a missing value and would deserialise as zero instead.

Key features of the JSON to Java Class

Classes or records

Traditional POJOs work on every Java version; records need 17 and give you equals, hashCode and toString for free.

Jackson annotations included

JsonProperty preserves the original key, so camelCase Java fields bind to snake_case JSON without configuration.

Boxed types where needed

Long rather than long wherever a key can be absent, because a primitive would become 0 and hide the difference.

Full accessors generated

Every field gets a getter and setter in class mode, which is what Jackson and most frameworks bind against.

Nested types named sensibly

Each nested object becomes its own type, named from the key that holds it, ready to split into files.

How to use the JSON to Java Class

  1. 1

    Paste the JSON

    An array of records gives better optional-field detection.

  2. 2

    Choose class or record

    Classes work everywhere; records need Java 17 and are far shorter.

  3. 3

    Name the root type

    Nested types are named from their keys.

  4. 4

    Copy into your project

    Paste into a .java file, one public type per file.

Frequently asked questions

For the annotations, yes — add com.fasterxml.jackson.core:jackson-databind. Spring Boot already includes it. Remove the annotations if your keys already match the field names exactly.

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