Calculator
What the JSON to Swift does
JSON to Swift: converts Status and Swift from JSON and Root struct name. Example: root struct name Root gives status 3 structs generated.
From JSON and Root struct name, this tool derives Status and Swift. The result recalculates on every keystroke without a button press or a page reload.
It is mostly used by people inspecting an API response. Most of these tasks are one-liners in a terminal, but not when you are away from one.
There is no account, no upload and no server round trip, because the page does the work itself.
The method, a field-by-field reference and a worked example built from the defaults are all on this page.
What do the JSON to Swift fields mean?
The JSON to Swift uses 2 inputs. The form opens pre-filled, so the fastest way in is usually to overwrite the one field you actually care about.
| Field | What to enter | Default |
|---|---|---|
| JSON | paste or type any amount of text | { "id": 42, "name": "Ada", "is_active": true, "score": 9.5, "tags": ["admin", "dev"], "address": { "city": "London", "zip": "N1" }, "orders": [ { "id": 1, "total": 19.99 }, { "id": 2, "total": 5, "note": "gift" } ] } |
| Root struct name | required | Root |
How does the JSON to Swift work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same conversion.
The guard clauses run before the formula does, which is why mistakes surface next to the field.
Worked example
These are the values the JSON to Swift loads by default, and the result it produces from them. These are the tool’s own default values and the result they produce, not an invented illustration.
| JSON | { "id": 42, "name": "Ada", "is_active": true, "sc… |
|---|---|
| Root struct name | Root |
| Status | 3 structs generated |
|---|---|
| Swift | import Foundation struct Root: Codable { let id: Int let name: String let isActive: Bool let score… |
How to use it
- Paste your content into JSON.
- Type Root struct name.
- Live output means you can search for a target value by nudging an input up and down.
- The panel reports Status and Swift.
- Both Copy Link and Print capture the current state, so pick whichever suits how you file things.
What this tool does not do
- Output follows the common convention for this format; a specific toolchain may have its own house style.
- Processing happens in your browser, so extremely large inputs are bounded by available memory.
- There is no audit trail: if you need one, record the inputs alongside the output.
Frequently asked questions
JSON and Root struct name. That is the whole form. A starting value is in place for each, which makes it easy to isolate the effect of a single variable.
With the values loaded when the page opens, status comes out as 3 structs generated. It recalculates the moment an input changes, which makes comparing scenarios quick.
Nothing leaves your machine. The only network traffic is loading the page itself.
It costs nothing, and there is no limit on repeat use.
Reliable for the case described. Where more than one convention exists, the method section says which one is used.