YAML to Objective-C Converter

Paste a YAML document and get Objective-C model classes with @interface, @implementation, and typed NSString, NSNumber, NSArray properties.

Last updated: May 28, 2026

Root class: Prefix: Nullable propertiesDictionary mapper

YAML Input

Generated Objective-C Classes

#import <Foundation/Foundation.h>



@interface WTPAddress : NSObject
@property (nonatomic, copy, nullable) NSString *city;
@property (nonatomic, copy, nullable) NSString *zip;
+ (instancetype)modelWithDictionary:(NSDictionary *)dictionary;
@end

@implementation WTPAddress
+ (instancetype)modelWithDictionary:(NSDictionary *)dictionary {
    WTPAddress *model = [[self alloc] init];
    if ([dictionary[@"city"] isKindOfClass:[NSString class]]) {
        model.city = dictionary[@"city"];
    }
    if ([dictionary[@"zip"] isKindOfClass:[NSString class]]) {
        model.zip = dictionary[@"zip"];
    }
    return model;
}
@end

@interface WTPRoot : NSObject
@property (nonatomic, copy, nullable) NSString *name;
@property (nonatomic, assign) NSInteger age;
@property (nonatomic, assign) BOOL active;
@property (nonatomic, strong, nullable) WTPAddress *address;
@property (nonatomic, copy, nullable) NSArray<NSString *> *tags;
+ (instancetype)modelWithDictionary:(NSDictionary *)dictionary;
@end

@implementation WTPRoot
+ (instancetype)modelWithDictionary:(NSDictionary *)dictionary {
    WTPRoot *model = [[self alloc] init];
    if ([dictionary[@"name"] isKindOfClass:[NSString class]]) {
        model.name = dictionary[@"name"];
    }
    model.age = [dictionary[@"age"] integerValue];
    model.active = [dictionary[@"active"] boolValue];
    if ([dictionary[@"address"] isKindOfClass:[NSDictionary class]]) {
        model.address = [WTPAddress modelWithDictionary:dictionary[@"address"]];
    }
    if ([dictionary[@"tags"] isKindOfClass:[NSArray class]]) {
        model.tags = dictionary[@"tags"];
    }
    return model;
}
@end

Client-Side Processing

Input Data Stays on Device

Instant Local Execution

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What is YAML to Objective-C Converter?

This converter parses YAML to JSON internally, then generates Objective-C model classes. Scalar values become NSString or NSNumber properties, sequences become NSArray properties, and nested mappings produce nested @interface / @implementation pairs. An optional dictionaryMapper method provides basic JSON dictionary initialization.

How to Use YAML to Objective-C Converter

Paste YAML into the input panel.

Set a root class name and optional class prefix.

Toggle nullable annotations and dictionaryMapper generation.

Copy the generated Objective-C code.

Common Use Cases

Generating iOS model classes from a YAML API sample.
Scaffolding Objective-C types before writing NSJSONSerialization parsing code.
Producing model classes for an Objective-C data layer from YAML configs.
Converting YAML service definitions to Objective-C DTOs.

Example Input and Output

A small YAML mapping becomes an Objective-C model class.

YAML input

name: Alice
age: 30
active: true

Generated Objective-C

@interface WTPRoot : NSObject
@property (nonatomic, copy) NSString * _Nullable name;
@property (nonatomic, strong) NSNumber * _Nullable age;
@property (nonatomic, strong) NSNumber * _Nullable active;
@end

Tip

For production iOS code, consider using Mantle or similar libraries for automatic JSON-to-model mapping instead of hand-written initializers.

Frequently Asked Questions

What is the class prefix for?

Objective-C does not have namespaces, so a two- or three-letter prefix (e.g., WTP, NS, ABC) is used to avoid naming conflicts between classes.

How are YAML sequences handled?

Sequences become NSArray properties. For typed arrays of objects, a nested model class is generated.

Is my YAML sent anywhere?

No. All parsing and Objective-C generation happen entirely in your browser.

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How to Use YAML to Objective-C Converter

Common Use Cases

Example Input and Output

Tip

Frequently Asked Questions

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