JSON to Go Struct Converter
Paste a JSON sample to instantly generate matching Go structs with json struct tags, nested types, and pointer types for optional/nullable fields. Free online developer tool.
Paste JSON
Go Struct
Go struct definitions will appear here...
Free JSON to Go Struct Converter
Paste a JSON sample to instantly generate matching Go struct declarations, complete with PascalCase field names and json struct tags that preserve your original key names.
How to Use It
Paste any JSON object or array, or click "Load Example." The tool infers a type shape from the sample and emits one struct per object level. Nested objects get their own named struct, arrays become slices ([]T), and fields that are optional or nullable in your sample become pointer types (*T) — the idiomatic Go way to represent JSON fields that might be absent or null.
Example
Given {"name": "Ann", "age": 30, "tags": ["a","b"], "address": {"city": "NYC", "zip": null}}, the tool emits a RootAddress struct with City string andZip interface{} fields tagged json:"city" /json:"zip", plus a Root struct that embeds it.
Common Use Cases
- Generating structs to unmarshal an API response with
encoding/json. - Bootstrapping Go types for a webhook payload or third-party API without typing every field by hand.
- Making sure struct tags exactly match the original JSON key casing.
- Quickly scaffolding request/response types for a new Go microservice.
FAQs
Why are some fields pointer types?
Go's zero values (like 0 or "") are indistinguishable from a field that was never sent. For any property that's missing from at least one sample object or was evernull, the generator uses a pointer (*string, *int, etc.) sonil unambiguously means "not present."
Does it use the standard library's encoding/json?
The generated json:"..." tags work with Go's standard encoding/jsonpackage directly — no extra dependency required.
Is my JSON uploaded anywhere?
No — parsing and struct generation happen entirely client-side in your browser. Nothing you paste is sent to a server.