JSON Swiss

JSON Swiss

JSON To JavaScript Generator

Need to convert JavaScript into JSON Schema?

Create schemas from JS classes or constructor functions.

JavaScript → JSON Schema

JSON Input

1

Generated JavaScript

Configuration

Paste your JSON data to generate JavaScript classes and objects

Generate ES6 classes, objects, and modern JavaScript patterns

How to convert JSON to JavaScript – step-by-step guide

Use this JSON to JavaScript generator to create JSDoc types or runtime-friendly models from JSON samples for Node.js and frontend apps.

  1. Step 1 – Paste a JSON sample

    • Paste a representative JSON object or array into the left editor.
    • Include nested objects, arrays, and nullable fields so types are inferred correctly.
    • Use Import to load JSON from a file, URL, or sample data.

  2. Step 2 – Choose JavaScript output options

    • Decide whether you want plain objects, JSDoc typedefs, or class-like helpers.
    • Review how optional fields are represented and document them clearly.
    • Keep naming consistent with your codebase (camelCase vs snake_case).

  3. Step 3 – Review the generated code

    • Check field names, types, and how arrays/objects are modeled.
    • Adjust options like Root Type Name, null handling, and frameworks if available.
    • If a field is inferred incorrectly, tweak your sample JSON and regenerate.

  4. Step 4 – Use the output in your JS project

    • Copy the output into your project and wire it up where you parse JSON.
    • Validate inputs at runtime if you rely on dynamic typing.
    • Consider generating a JSON Schema to enforce contracts.

  5. Step 5 – Copy or download

    • Copy the output into your project or download it as a file.
    • Run your formatter/linter to match your code style.
    • Add JSON parsing/serialization libraries if your language requires them.

Quick tips

  • Pair JS models with runtime validation to catch bad payloads early.
  • Prefer consistent date handling (string vs Date) across the app.
  • If you can, switch to TypeScript for stronger guarantees.
Example output (simplified)
// JSON input
{
  "id": 123,
  "name": "Maeve Winters",
  "email": "maeve@example.com",
  "active": true,
  "roles": ["admin", "editor"],
  "metadata": { "plan": "pro" },
  "createdAt": "2024-03-01T10:15:00Z",
  "score": 99.5,
  "notes": null
}

// Generated JSDoc types (simplified)
/**
 * @typedef {Object} Metadata
 * @property {string} plan
 */

/**
 * @typedef {Object} Root
 * @property {number} id
 * @property {string} name
 * @property {string|null} email
 * @property {boolean} active
 * @property {string[]} roles
 * @property {Metadata} metadata
 * @property {string} createdAt
 * @property {number} score
 * @property {null} notes
 */

Related JSON & JavaScript tools

Explore more JSON and schema tools that work great alongside this JSON to JavaScript generator.

JSON to TypeScript Generator

Generate TypeScript types when you want compile-time safety.

JavaScript Class to JSON & JSON Schema

Convert existing JS classes into JSON examples and JSON Schema for docs and validation.

JSON Schema Generator

Generate a JSON Schema from JSON samples to validate payloads and contracts.

JSON Formatter & Validator

Format and validate JSON before generating output to avoid runtime issues.

Frequently Asked Questions

What JavaScript code structures can be generated from JSON?

The generator creates JavaScript classes, objects, and data structures based on your JSON input. It analyzes the JSON structure and generates corresponding ES6 classes, constructor functions, or plain object templates with proper property definitions.

Can I customize the generated JavaScript code style?

Yes, you can customize indentation size (2, 4, or 8 spaces), export type (ES6 export, declare, or none), root object name, and whether to generate classes or plain objects. The generator adapts to modern JavaScript standards.

How does the generator handle nested objects and arrays?

Nested objects are converted to nested classes or object properties, while arrays are represented with appropriate type annotations in comments. The generator maintains the hierarchical structure of your original JSON data.

Can I use the generated code directly in my JavaScript project?

Absolutely! The generated code follows JavaScript best practices and can be directly imported into your project. You can choose between different export formats to match your project's module system (ES6 modules, CommonJS, etc.).

JSON to JavaScript Object Generator Online | JSONSwiss