JSON to MobX-State-Tree Converter - Generate MST Models Online

Online JSON to MobX-State-Tree Converter

Simplify your state management with our JSON to MobX-State-Tree (MST) converter. MobX-State-Tree is a powerful, transactional, and strictly typed state container for React and JavaScript applications. However, manually defining MST models for complex API responses can be repetitive. This tool allows you to paste a JSON sample and instantly generate MST models, including types.model, properties, and inferred types.

Why Convert JSON to MobX-State-Tree Models?

MST offers a unique combination of predictability (like Redux) and ease of use (like MobX), but its schema definition can be verbose.

Accelerate Store Development

Instead of manually typing out types.string, types.number, or types.maybe, our tool analyzes your data structure and generates the model for you. This is the fastest way to build stores based on real backend data.

Built-in Type Safety and Validation

MST provides runtime validation for your data. By generating models directly from JSON, you ensure that your state container accurately reflects the data it receives, catching structural errors before they break your application.

Key Features of Our JSON to MST Tool

Our converter is tailored specifically for the MST API, handling everything from basic scalars to complex nested trees.

1. Automatic MST Type Mapping

Our engine maps standard JSON types to their MST equivalents:

• string → types.string

• number → types.number

• boolean → types.boolean

• null → types.maybe(types.string)

• array → types.array(...)

2. Recursive Nested Models

For nested objects, the tool avoids using generic types.frozen(). Instead, it recursively generates separate types.model definitions. This allows you to use MST’s powerful features—like actions, views, and snapshots—at every level of your state tree.

3. Identifier Detection

If your JSON contains common primary key fields like id, uuid, or slug, the tool will intelligently suggest using types.identifier or types.identifierNumber. This is crucial for MST’s normalization and referencing capabilities.

How to Use the JSON to MST Converter

1. Paste your JSON: Copy your API response or data object into the input box.

2. Define Model Name: (Optional) Give your root model a name, such as UserStore or PostModel.

3. Instant Conversion: The tool generates the MobX-State-Tree code in real-time.

4. Copy & Paste: Copy the generated code into your project. Simply add your .actions() and .views() to finish your store.

Technical Insights: MST Best Practices

Handling Optionality and Snapshots

MST is strict about data types. Our tool treats your JSON as a "Snapshot." If the JSON data is missing certain fields, the tool can wrap those types in types.optional or types.maybe to ensure your app remains resilient when receiving incomplete data.

Seamless TypeScript Integration

The generated code is fully compatible with TypeScript. You can easily infer the TypeScript interface from the generated model using: interface IYourModel extends Instance<typeof YourModel> {}

Frequently Asked Questions (FAQ)

Is this tool compatible with MobX-State-Tree v5 and v6?

Yes! The output uses standard MST syntax that is compatible with all modern versions of the library.

Can I convert large JSON objects?

Absolutely. Our tool is optimized to parse and convert large, deeply nested JSON files instantly without any performance lag.

Is my data secure?

Yes. Your privacy is our priority. All conversion logic is executed locally in your browser using JavaScript. Your JSON data never reaches our servers, making it safe for processing private or sensitive data.