JSON to Go Struct
LiveGenerate Go struct definitions from JSON data with proper tags.
Understanding JSON (JavaScript Object Notation)
Go's static type system requires defining struct types for JSON marshaling and unmarshaling. Go structs map JSON keys to struct fields using field tags (json:"field_name"), and the type system catches mismatches at compile time. Manually writing Go structs from JSON API responses is time-consuming and error-prone — nested objects need separate struct types, arrays need slice types, and JSON naming conventions (camelCase) must be mapped to Go conventions (PascalCase) with appropriate struct tags.
Convert JSON data to Go struct definitions automatically. Generates proper Go types with json struct tags, handles nested objects as separate structs, infers int vs float types, supports slices, and uses PascalCase naming. Produces idiomatic Go code ready for your application.
The Devkitr JSON to Go Struct Converter generates Go struct definitions with json tags from JSON data. Paste a JSON object to get properly typed Go structs with PascalCase field names, json:"camelCase" tags, nested struct definitions, and correct Go types for each JSON value.
In a typical development workflow, JSON to Go Struct becomes valuable whenever you need to generate go struct definitions from json data with proper tags. Whether you are working on a personal side project, maintaining production applications for a company, or collaborating with a distributed team across time zones, having a reliable browser-based conversion tool eliminates the need to install desktop software, write one-off scripts, or send data to third-party services that may log or retain your information. Since JSON to Go Struct processes everything locally on your device, your data stays private and your workflow stays uninterrupted — open a browser tab, paste your input, get your result.
Key Features
Struct Tag Generation
Creates json:"fieldName" struct tags mapping PascalCase Go fields to their original JSON key names.
Go Type Inference
Maps JSON types to idiomatic Go types: string, int64, float64, bool, and nested struct types for objects.
Nested Struct Extraction
Creates separate named struct types for nested JSON objects rather than inline anonymous structs.
Pointer Types for Nullable
Uses pointer types (*string, *int) for JSON fields that can be null, distinguishing zero values from absent values.
How to Use JSON to Go Struct
Paste JSON Data
Enter a JSON object from an API response, configuration, or any source you need to marshal/unmarshal in Go.
Set Root Struct Name
Choose a name for the root struct type that matches Go naming conventions and your package's type naming.
Review Generated Structs
Check field types, json tags, nested struct definitions, and pointer usage for nullable fields.
Copy Go Code
Copy the struct definitions into your Go source files for use with json.Marshal and json.Unmarshal.
Use Cases
API Client Development
Generate Go struct types matching REST API response shapes for type-safe HTTP client implementations.
Configuration Parsing
Create Go structs for JSON configuration files that will be loaded with json.Unmarshal at application startup.
gRPC/Protocol Buffer Mapping
Generate Go structs corresponding to JSON-serialized message formats for JSON-to-Protobuf conversion layers.
Database Result Mapping
Create Go structs matching JSON documents stored in MongoDB, CouchDB, or PostgreSQL JSONB columns.
Pro Tips
Use json:"fieldName,omitempty" to omit zero-value fields during marshaling — add omitempty to the generated tags for cleaner JSON output.
For fields that could be null in JSON, use pointer types (*string, *int64) to distinguish between null and empty/zero values.
Name nested structs descriptively (UserAddress, OrderItem) rather than accepting generic names (Data, Item) from the generator.
If a JSON field can hold multiple types (string or number), use json.RawMessage and handle type detection manually.
Common Pitfalls
Using int instead of int64 for JSON numbers
Fix: JSON numbers can exceed int32 range. Use int64 for integer fields and float64 for decimal fields to handle all valid JSON numbers.
Not using pointer types for optional/nullable fields
Fix: Without pointers, Go cannot distinguish between "field is absent" (null) and "field is zero" (0, ""). Use *string for nullable string fields.
Forgetting json struct tags on exported fields
Fix: Without json:"fieldName" tags, Go uses the field name as-is for JSON keys. PascalCase field names produce PascalCase JSON keys instead of camelCase.
Frequently Asked Questions
QDoes it handle nested objects?
Yes. Nested JSON objects become separate Go struct types with proper references.
QAre json tags included?
Yes. Each field includes a `json:"fieldName"` struct tag matching the original JSON key name.
QHow are types inferred?
Strings, integers (int64), floats (float64), booleans, and nested structs are automatically detected from JSON values.
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