Converters

JSON to Go Struct

Generate Go struct definitions from JSON data

JSON Input

About

Generates Go struct definitions from JSON input, creating nested structs, arrays, and maps with proper Go types. Supports custom JSON tags in snake_case or camelCase, omitempty for optional fields, and "inline" flattening for embedded structs.

Manually writing Go structs for complex JSON APIs is tedious and error-prone, especially with deeply nested objects. Automates the mapping between JSON schemas and Go type definitions, saving development time and reducing bugs.

Who should use this tool?

Go developers working with REST APIs, microservices, or any JSON-based data interchange who need to quickly scaffold struct definitions.

Common use cases

Generate Go structs from third-party API JSON responses for unmarshaling
Create configuration structs from JSON config file samples
Scaffold data models from JSON schema definitions or example payloads
Rapidly prototype Go programs that consume JSON webhook payloads
Convert Swagger/OpenAPI JSON examples into Go type definitions
Bridge JSON test fixtures into Go test structs for unit testing

How to Use

Paste your JSON input into the editor; the tool auto-detects and parses the structure

Toggle struct options: JSON tags (snake_case/camelCase/disabled), omitempty for optional fields, and "inline" for flattening nested objects

Set the package name (default "main") and optionally enable exporting types (uppercase first letter)

Configure type preference for numbers (float64 vs int) and time fields (string vs time.Time)

Click "Generate" and review the output; nested objects become separate struct types with proper references

Copy the generated Go code to your editor or use the "Copy" button; refine by adjusting options and regenerating

Examples

Input: {"name":"Alice","age":30,"address":{"city":"NYC"}} -> Output: type Address struct { City string `json:"city"` }\ntype Person struct { Name string `json:"name"` Age int `json:"age"` Address Address `json:"address"` }

Input: {"metadata":{"created":"2024-01-01T00:00:00Z"}} with timeType=time.Time -> Output: type Metadata struct { Created time.Time `json:"created"` }

Best Practices

Use representative JSON samples that include all optional fields to generate complete structs
Enable omitempty only for fields you expect to be absent; it adds pointer types for optional values
Set the package name to match your Go module structure rather than using the default "main"
Review generated types for ambiguous numeric fields and manually adjust int vs float64 as needed
For large JSON payloads, generate structs in sections and compose them manually for cleaner organization

Common Mistakes

Assuming the tool handles oneOf/anyOf schema patterns; it generates structs from concrete JSON, not schemas
Forgetting to enable "omitempty" and then getting errors when fields are missing from actual JSON
Using a single simple JSON sample that misses edge cases like null values or empty arrays
Expecting the tool to handle polymorphic fields or union types not present in standard JSON
Not adjusting the package name and then getting import conflicts in multi-package projects

FAQ

Does it support nested objects? Yes, each level of nesting becomes its own struct type with proper Go composition.

Can I generate time.Time fields for date strings? Yes, toggle the timeType option to convert matching patterns to time.Time instead of string.

What about nullable fields? Enable omitempty to mark fields as optional, and null values in JSON will be represented as pointer types where appropriate.

Does it generate JSON tags with dashes or underscores? You can choose between snake_case, camelCase, or disable JSON tags entirely.

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Learning Resources

Dive deeper with our comprehensive guides and tutorials.

JSON to Go Struct - Beginner's Guide

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JSON to Go Struct Advanced Techniques

8 min read

JSON to Go Struct

Generate Go struct definitions from JSON data

JSON Input

About

Who should use this tool?

Go developers working with REST APIs, microservices, or any JSON-based data interchange who need to quickly scaffold struct definitions.

Common use cases

Generate Go structs from third-party API JSON responses for unmarshaling
Create configuration structs from JSON config file samples
Scaffold data models from JSON schema definitions or example payloads
Rapidly prototype Go programs that consume JSON webhook payloads
Convert Swagger/OpenAPI JSON examples into Go type definitions
Bridge JSON test fixtures into Go test structs for unit testing

How to Use

Paste your JSON input into the editor; the tool auto-detects and parses the structure

Toggle struct options: JSON tags (snake_case/camelCase/disabled), omitempty for optional fields, and "inline" for flattening nested objects

Set the package name (default "main") and optionally enable exporting types (uppercase first letter)

Configure type preference for numbers (float64 vs int) and time fields (string vs time.Time)

Click "Generate" and review the output; nested objects become separate struct types with proper references

Copy the generated Go code to your editor or use the "Copy" button; refine by adjusting options and regenerating

Examples

Input: {"name":"Alice","age":30,"address":{"city":"NYC"}} -> Output: type Address struct { City string `json:"city"` }\ntype Person struct { Name string `json:"name"` Age int `json:"age"` Address Address `json:"address"` }

Input: {"metadata":{"created":"2024-01-01T00:00:00Z"}} with timeType=time.Time -> Output: type Metadata struct { Created time.Time `json:"created"` }

Best Practices

Use representative JSON samples that include all optional fields to generate complete structs

Enable omitempty only for fields you expect to be absent; it adds pointer types for optional values

Set the package name to match your Go module structure rather than using the default "main"

Review generated types for ambiguous numeric fields and manually adjust int vs float64 as needed

For large JSON payloads, generate structs in sections and compose them manually for cleaner organization

Common Mistakes

Assuming the tool handles oneOf/anyOf schema patterns; it generates structs from concrete JSON, not schemas

Forgetting to enable "omitempty" and then getting errors when fields are missing from actual JSON

Using a single simple JSON sample that misses edge cases like null values or empty arrays

Expecting the tool to handle polymorphic fields or union types not present in standard JSON

Not adjusting the package name and then getting import conflicts in multi-package projects

FAQ

Does it support nested objects? Yes, each level of nesting becomes its own struct type with proper Go composition.

Can I generate time.Time fields for date strings? Yes, toggle the timeType option to convert matching patterns to time.Time instead of string.

What about nullable fields? Enable omitempty to mark fields as optional, and null values in JSON will be represented as pointer types where appropriate.

Does it generate JSON tags with dashes or underscores? You can choose between snake_case, camelCase, or disable JSON tags entirely.

JSON to Go Struct

About

Who should use this tool?

Common use cases

How to Use

Examples

Best Practices

Common Mistakes

FAQ

Related Tools

Same Category — Converters

JSON to CSV Converter

CSV to JSON Converter

JSON to TypeScript

Timestamp Converter

Popular Tools

JSON Formatter

Base64 Encoder/Decoder

JWT Decoder

Learning Resources

Share

JSON to Go Struct

About

Who should use this tool?

Common use cases

How to Use

Examples

Best Practices

Common Mistakes

FAQ

Related Tools

Same Category — Converters

JSON to CSV Converter

CSV to JSON Converter

JSON to TypeScript

Timestamp Converter

Popular Tools

JSON Formatter

Base64 Encoder/Decoder

JWT Decoder

Learning Resources

Share