AES Encrypt & Decrypt
Encrypt text with a password using AES-GCM, and decrypt it back.
JSON to Go Struct
Generate Go structs with json tags from a sample payload.
Field names follow Go's initialism rules, so user_id becomes
UserID rather than UserId.
Quick Tool Overview
The JSON to Go Struct converter writes gofmt-aligned structs with json tags, exported field names that follow Go's initialism rules, and pointer types wherever a field can be absent or null.
- What it does
- Generates Go structs with json tags from a sample
- You give it
- A JSON payload, ideally an array of records
- You get back
- Aligned struct declarations ready for encoding/json
- Best for
- Unmarshalling a third-party API without hand-writing types
About the JSON to Go Struct
Go needs a struct before it can unmarshal anything, and writing one by hand for a large response is tedious. Paste the JSON and get the structs, with the field names exported, the json tags carrying the original keys, and the declarations aligned the way gofmt would leave them.
The naming follows Go convention rather than a naive capitalisation: user_id becomes UserID, api_url becomes APIURL, and the other initialisms the style guide lists are uppercased too. Fields that are absent from some records or that appear as null are declared as pointers, which is how Go distinguishes a missing value from a zero one. There is an omitempty option for the structs you marshal back out.
Key features of the JSON to Go Struct
Go naming, not naive capitalisation
user_id becomes UserID and api_url becomes APIURL, matching the style guide that linters such as golint enforce.
Pointers for optional fields
A *int64 that is nil means the key was absent; a plain int64 of 0 could mean either. The distinction is preserved.
gofmt alignment
Field names, types and tags are padded into columns exactly as gofmt would leave them, so the paste needs no reformatting.
omitempty when you need it
Add the tag option in one click for structs that get marshalled back out and should omit their zero values.
Safe numeric widths
Numbers are typed int64 and float64, because JSON routinely carries values beyond the 32-bit range.
How to use the JSON to Go Struct
-
1
Paste the JSON
An array of records produces better optional-field detection than a single object.
-
2
Name the root struct
Nested structs are named from their keys automatically.
-
3
Choose the tag options
Add omitempty when the struct will be marshalled back to JSON.
-
4
Copy into your package
Paste the result into a .go file — the declarations are already aligned.
Frequently asked questions
Because Go cannot otherwise tell an absent field from a zero value. A *int64 that is nil means the key was missing; an int64 that is 0 could mean either.
The Go style guide says initialisms keep a consistent case, so ID, URL, API and HTTP are fully uppercase. Linters such as golint flag the alternative.
Because JSON numbers can exceed the 32-bit range and int is platform-sized. int64 is the safe default; narrow it by hand when you know the range.
They are generated as string, since that is what the JSON holds. Change the type to time.Time when the format is RFC 3339 — encoding/json parses that automatically.
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