From data to class

JSON to Java — generate Java records from JSON

Paste JSON object, give the root record name, and copy Java 16+ records — no upload, no account.

API responses and configs dey come as JSON plenty times, but Java code want typed records. This tool dey sketch Java record definitions wey follow the object shape, including nested objects and lists.

Everything dey run for your browser: paste JSON for left, change root class name if you want, click Generate, then copy Java for right. Invalid JSON or root wey no be object — clear error.

Generate Browse the Data to Class hub

JSON to Java workspace

From sample payload to records wey look ready to compile — you no need leave the tab.

JSON input

Java output

Wetin you fit do here

From sample payload to records wey look ready to compile — you no need leave the tab.

Emit Java records with fields wey dem infer from strings, numbers, booleans, objects, and arrays.

Nested record types for nested JSON objects; arrays become List types with import when e need.

Copy the generated source with one click for your IDE or merge request.

Your JSON no dey leave the browser — we no dey send am go server to generate Java.

Generation na when you click Generate, so half-finished edits no dey spoil the output.

How to use am

Paste JSON object for the left editor (API sample, fixture, or logged payload).

If you like, change the root record name, then click Generate.

Check the Java for right, adjust names if you need, generate again, then Copy.

Wetin to expect

Output dey target Java 16+ records and e dey use Jackson fully qualified @JsonProperty only when JSON key no be valid Java identifier. Numbers map to Double; empty arrays become List＜Object＞. Big documents fit slow the tab — trim samples if you fit.

Quick sample

Paste this object, then click Generate:

{
  "user": {
    "id": 42,
    "name": "Ada",
    "active": true
  },
  "tags": ["dev", "json"]
}

Use am together with JSON formatting or explore other tools for my2ls.

Quick question

Dem dey upload my JSON to generate Java?

No. Generation dey run entirely for your browser. The text wey you paste no dey send to us to produce Java source.