JSON to Java POJO Converter – Free Online | JsonToTable

Java Output

Generated Java will appear here

Paste a sample payload on the left; Java POJO source appears on the right.

An order with customer, line items, a null coupon and a shipped timestamp

This page posts your JSON sample to /api/convert so the server can emit Java classes. We do not persist the body in a database, and application logs do not record it. An in-memory cache may keep the result for at most one hour. Strip secrets before converting.

How to Use This JSON to Java Converter

Feed the converter a representative payload. Review the POJOs before wiring ObjectMapper or Gson in your service.

1

Step 1 – Provide a Representative Payload

Paste an object or array that mirrors production responses, or upload a .json file. If the editor reports a syntax problem, fix it with the JSON validator first.

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Editor or file - Objects, arrays, or a .json upload up to 1 MB.

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Parser feedback - Invalid samples show the failure position immediately.

Example order JSON

{
  "orderId": 9001,
  "customer": {
    "fullName": "Mei Chen",
    "email": "[email protected]",
    "loyaltyTier": "gold"
  },
  "lineItems": [
    { "sku": "KB-01", "quantity": 2, "unitPrice": 49.9, "giftWrap": true },
    { "sku": "MS-07", "quantity": 1, "unitPrice": 18, "giftWrap": false }
  ],
  "shippedAt": "2026-10-20T14:30:00Z",
  "couponCode": null,
  "notes": ["leave at door", "fragile"]
}

2

Step 2 – Review the POJO Set

Root is the entry class. Nested objects such as customer and lineItems become their own public classes with getters and setters.

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Bean style - Private fields with getX / setX methods.

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Nested models - Object graphs expand into separate .java types.

Generated Java (Root and nested)

// Root.java

package io.quicktype;

import java.time.OffsetDateTime;

public class Root {
    private long orderID;
    private Customer customer;
    private LineItem[] lineItems;
    private OffsetDateTime shippedAt;
    private Object couponCode;
    private String[] notes;

    public long getOrderID() { return orderID; }
    public void setOrderID(long value) { this.orderID = value; }

    public Customer getCustomer() { return customer; }
    public void setCustomer(Customer value) { this.customer = value; }

    public LineItem[] getLineItems() { return lineItems; }
    public void setLineItems(LineItem[] value) { this.lineItems = value; }

    public OffsetDateTime getShippedAt() { return shippedAt; }
    public void setShippedAt(OffsetDateTime value) { this.shippedAt = value; }

    public Object getCouponCode() { return couponCode; }
    public void setCouponCode(Object value) { this.couponCode = value; }

    public String[] getNotes() { return notes; }
    public void setNotes(String[] value) { this.notes = value; }
}

// Customer.java

package io.quicktype;

public class Customer {
    private String fullName;
    private String email;
    private String loyaltyTier;

    public String getFullName() { return fullName; }
    public void setFullName(String value) { this.fullName = value; }

    public String getEmail() { return email; }
    public void setEmail(String value) { this.email = value; }

    public String getLoyaltyTier() { return loyaltyTier; }
    public void setLoyaltyTier(String value) { this.loyaltyTier = value; }
}

// LineItem.java

package io.quicktype;

public class LineItem {
    private String sku;
    private long quantity;
    private double unitPrice;
    private boolean giftWrap;

    public String getSku() { return sku; }
    public void setSku(String value) { this.sku = value; }

    public long getQuantity() { return quantity; }
    public void setQuantity(long value) { this.quantity = value; }

    public double getUnitPrice() { return unitPrice; }
    public void setUnitPrice(double value) { this.unitPrice = value; }

    public boolean getGiftWrap() { return giftWrap; }
    public void setGiftWrap(boolean value) { this.giftWrap = value; }
}

3

Step 3 – Drop Classes into Your Module

Copy or download the source, change the package name, then deserialize with Jackson or Gson in your service layer.

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Save .java - Downloads json-to-java-<timestamp>.java.

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Clipboard - Copies the full class set in one click.

⚡Export the generated model classes

2 Actions

💾

Save

json-to-java-<date>.java

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Clipboard

Copy Java source

💡Tip: rename package io.quicktype before merging.

JSON to Java Inference Table

What this JSON to Java converter picks when it reads your sample values.

Sample value → emitted Java type

In the JSON sample	In the Java output
JSON string	`Java String`
Integer without fraction	`long`
Decimal number	`double`
Boolean literal	`boolean (or Boolean if sometimes absent)`
Nested object	`Separate public class`
Homogeneous object array	`Typed array, e.g. LineItem[]`
String list	`String[]`
ISO-8601 instant	`OffsetDateTime`
Property missing on some rows	`Wrapper type (Boolean, String, …)`

Bean Naming and Sparse Array Keys

Property names, getters, and what happens when array elements disagree.

Awkward keys

Hyphens, reserved words, leading digits and spaces are normalized into getters.

Generated Java for awkward keys

// {"api-key":"k","class":"demo","3dModel":1,"XMLHttp":true,"order id":9}

package io.quicktype;

public class Root {
    private String apiKey;
    private String rootClass;
    private long the3DModel;
    private boolean xmlHTTP;
    private long orderID;

    public String getAPIKey() { return apiKey; }
    public void setAPIKey(String value) { this.apiKey = value; }

    public String getRootClass() { return rootClass; }
    public void setRootClass(String value) { this.rootClass = value; }

    public long getThe3DModel() { return the3DModel; }
    public void setThe3DModel(long value) { this.the3DModel = value; }

    public boolean getXMLHTTP() { return xmlHTTP; }
    public void setXMLHTTP(boolean value) { this.xmlHTTP = value; }

    public long getOrderID() { return orderID; }
    public void setOrderID(long value) { this.orderID = value; }
}

Sparse catalog rows

Always-present sku stays String. Optional giftWrap / label become wrappers.

Generated Java for sparse rows

// [{"sku":"KB-01","qty":2,"giftWrap":true},{"sku":"MS-07","qty":1},{"sku":"CB-02","qty":3,"label":"rush"}]

package io.quicktype;

public class Root {
    private String sku;
    private long qty;
    private Boolean giftWrap;
    private String label;

    public String getSku() { return sku; }
    public void setSku(String value) { this.sku = value; }

    public long getQty() { return qty; }
    public void setQty(long value) { this.qty = value; }

    public Boolean getGiftWrap() { return giftWrap; }
    public void setGiftWrap(Boolean value) { this.giftWrap = value; }

    public String getLabel() { return label; }
    public void setLabel(String value) { this.label = value; }
}

Wire the Models into Jackson

Minimal ObjectMapper setup for the generated Root class.

Read and write Root

Pretty-print round-trips after registering the Java time module.

ObjectMapper snippet

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;

ObjectMapper mapper = new ObjectMapper().registerModule(new JavaTimeModule());
Root order = mapper.readValue(payload, Root.class);
System.out.println(order.getCustomer().getFullName());
System.out.println(order.getShippedAt());

Root fromFile = mapper.readValue(new File("order.json"), Root.class);
String encoded = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(fromFile);

JSON to Java POJO FAQs

JSON to Java questions about POJO fields, OffsetDateTime, wrappers and Jackson

How do I generate Java classes from JSON?

Drop an API payload into the left editor. The tool returns public classes with private fields plus getters and setters under package io.quicktype. Copy them into your module or download the .java file.

Will I get Lombok annotations or Java records?

Neither. Output stays on plain POJOs so it compiles on older JDKs without Lombok. Teams that prefer records or @Data can edit the generated source afterward.

Why do some fields use Boolean instead of boolean?

If a property is absent from part of an array sample, the generator picks a wrapper type. Wrappers can be null; primitives cannot. Homogeneous samples keep primitives such as boolean and long.

How are timestamps represented?

Strings that look like ISO-8601 instants (for example 2026-10-20T14:30:00Z) become OffsetDateTime. Register Jackson JavaTimeModule when you deserialize those properties.

Jackson or Gson — which fits the output?

Jackson is the usual Spring Boot default. Gson works too if property names already match or you add @SerializedName. The generator itself does not emit annotations.

Can I change package io.quicktype?

Yes. Every class file header uses package io.quicktype; rename it to your company package before committing.

How does this differ from Java to JSON?

/json-to-java builds model classes from a JSON sample. /java-to-json turns Java Map-style text into JSON. Pick the direction that matches the artifact you already have.

Does pasting upload my payload?

Yes — the sample is posted to /api/convert, turned into Java POJO source, and returned to the browser. Application code does not write the payload to a database or request logs. Results may sit in an in-memory cache for up to one hour. Remove tokens and personal data first.

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