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JSON to Objective-C

Generate Objective-C classes/structs automatically from a JSON object.

100% Client-Side Local Execution
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What is JSON to Objective-C?

This free online tool turns a sample JSON payload into a ready-to-use model class conforming to NSObject for Objective-C, so you can use this json to objective-c model generator tool to go straight from raw JSON to a typed NSObject-based model class without writing the boilerplate yourself. It is built around Objective-C's actual idiom — a NSObject model class — rather than a generic one-size-fits-all class, and pairs naturally with NSJSONSerialization for real-world (de)serialization. Use it for json to objective-c class online or any time you need json model generator objective-c, whether you're scaffolding a new Objective-C project or mapping an existing API response.

Technical Execution

Paste or upload a sample JSON object or array and the tool walks its structure field by field, inferring a concrete Objective-C type for each value — mapping basic JSON types to `NSString *`, `NSInteger`/`NSNumber *`, `BOOL`, and `double` as appropriate. For nested data, it creates one `NSObject` subclass per nested JSON object, and types arrays as `NSArray<NSObject *> *` (or a more specific generic subclass) with the matching element class. On the naming side, it converts snake_case JSON keys into Objective-C's camelCase property convention and generates matching `NS_DESIGNATED_INITIALIZER` style init methods and `copyWithZone:` boilerplate. For optional data, properties that can be missing or `null` are declared `nullable` (or kept as `NSNumber *` instead of a primitive) in the generated `@interface`, since Objective-C primitives can't represent a null value.

Zero Data Storage Guarantee

Everything runs client-side in your browser: the sample JSON you paste in — which may contain real field names, endpoint shapes, or structure from a private API or project — is parsed and converted entirely on your device and is never uploaded to any server. Nothing you enter is logged, stored, or transmitted anywhere, so you can safely paste a real payload from an internal or unreleased API to generate an accurate NSObject model class. Closing or refreshing the tab clears everything, since no copy of your data ever left your machine in the first place.

How to Use JSON to Objective-C (Step-by-Step Guide)

  1. Copy a representative sample of your JSON (the more fields and nested objects it includes, the more complete the generated NSObject-based model class will be).
  2. Paste it into the input panel of the JSON to Objective-C tool, or click "Upload" to load it from a json file.
  3. Review the auto-detected root name, and rename it if you want the generated NSObject model class to use a specific class or type name instead of the default.
  4. Click "Generate" to produce the Objective-C NSObject-based model class, which appears instantly in the output panel with syntax highlighting.
  5. Click "Copy" to copy the generated code to your clipboard, or "Download" to save it as a `.h/.m` file.
  6. Paste the result into your Objective-C project and adjust field names or types if your data has edge cases the sample didn't cover.

Frequently Asked Questions (FAQ)

Q: How does this tool handle nested objects and arrays when converting JSON to Objective-C?
A: The tool creates one `NSObject` subclass per nested JSON object, and types arrays as `NSArray<NSObject *> *` (or a more specific generic subclass) with the matching element class That keeps the generated code organized the way a Objective-C developer would structure it by hand, instead of flattening everything into one giant NSObject-based model class.
Q: What happens to fields that are nullable or missing from some records?
A: For optional data, properties that can be missing or `null` are declared `nullable` (or kept as `NSNumber *` instead of a primitive) in the generated `@interface`, since Objective-C primitives can't represent a null value. If your sample only has one example object, fields that could be null in other records might not be detected as optional — paste a few varied samples (or an array of objects) for the most accurate result.
Q: Is this better than writing the NSObject-based model class by hand?
A: For anything beyond a trivial, flat payload, yes — writing an NSObject model by hand means declaring every `@property`, writing a `initWithDictionary:` parser, and keeping `NSNumber` boxing straight for every numeric field, which gets tedious fast on nested payloads. The generator produces the same result in seconds and gives you a correct starting point to refine, rather than a blank page.
Q: Is my JSON data safe to paste into this tool, especially if it's from a private API?
A: Yes. Everything runs client-side in your browser: the sample JSON you paste in — which may contain real field names, endpoint shapes, or structure from a private API or project — is parsed and converted entirely on your device and is never uploaded to any server. Nothing you enter is logged, stored, or transmitted anywhere, so you can safely paste a real payload from an internal or unreleased API to generate an accurate NSObject model class. Closing or refreshing the tab clears everything, since no copy of your data ever left your machine in the first place.
Q: Can I use this as a json to nsobject?
A: Yes — the tool is commonly used as a json to nsobject, and works the same way whether you're converting a one-off response for a prototype or generating model code for a production project.
Q: Does the tool rename fields to match Objective-C naming conventions?
A: Yes. It converts snake_case JSON keys into Objective-C's camelCase property convention and generates matching `NS_DESIGNATED_INITIALIZER` style init methods and `copyWithZone:` boilerplate, so the generated code reads naturally in Objective-C while still deserializing the original JSON correctly.
Q: What Objective-C library does the generated code work with?
A: The output is written to pair cleanly with NSJSONSerialization, the most common choice for Objective-C developers handling JSON, so you can drop it into an existing project without changing your serialization setup.
Q: Does this tool work for deeply nested or large JSON samples?
A: Yes. The tool recurses through every level of nesting it finds and generates a complete set of linked NSObject-based model class definitions, not just the top level — though for very large samples, trimming it down to one representative record per array is usually enough to get an accurate result.
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