JSON to Go Converter
Generate Go structs from a JSON payload, complete with the struct tags encoding/json needs to map fields correctly.
Your data stays on your device
Input — JSON
- characters
- 0
- lines
- 0
- size
- 0 B
Output — Go
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- 0
- lines
- 0
- size
- 0 B
Options
About this tool
Go requires exported field names to start with a capital letter, while JSON keys rarely do. Every field therefore needs a struct tag mapping the Go name back to the wire name — mechanical work that is easy to get subtly wrong on a large payload.
The generator produces idiomatic Go: exported PascalCase fields, correct tags, and separate named structs for nested objects. Common initialisms such as ID, URL and API are capitalised the way Go style expects.
How to use this tool
- Paste your JSON sample.
- Set the root struct name.
- Choose whether to add omitempty and whether nullable fields become pointers.
- Press Generate and paste the structs into your package.
Key features
- Exported PascalCase fields with matching json struct tags
- Go initialism handling: ID, URL, API, HTTP and others capitalised correctly
- Optional omitempty on every tag
- Optional pointer types so absent and zero values stay distinguishable
- int64 and float64 inferred separately, with []T for arrays
- interface{} only where a type genuinely cannot be determined
Example
Input — JSON
{"user_id":3,"created_at":"2026-01-05","score":9.5}Output — Go
type Root struct {
UserID int64 `json:"user_id"`
CreatedAt string `json:"created_at"`
Score float64 `json:"score"`
}Good to know
- Without pointers, an absent field and a zero value are indistinguishable after unmarshalling — that is a property of Go, not of this tool.
- Arrays with mixed element types fall back to []interface{}, since Go has no union type.
- No package clause is emitted; add your own when pasting into a file.
Frequently asked questions
When should I use pointer fields?
When you need to tell "the field was absent" apart from "the field was zero". For a count where 0 is meaningful, a *int is the only way to know which happened.
What does omitempty do?
It omits the field during marshalling when the value is the zero value. Useful for optional request payloads, but be careful: it also drops legitimate zeros and empty strings.
Why is my field named ID instead of Id?
Go style capitalises initialisms fully. The linter would flag Id, so the generator emits ID and keeps the original key in the tag.
Are nested objects inlined or named?
Named. Each nested object becomes its own struct, which keeps the code readable and lets you reference the type elsewhere.
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