Calculator
What the JSON to Dart does
JSON to Dart: converts Status and Dart from JSON and Root class name. Example: root class name Root gives status 3 classes generated.
Point it at JSON and Root class name and it returns Status and Dart. Edit a field and the answer updates in place.
Typical users are people inspecting an API response. Most of these tasks are one-liners in a terminal, but not when you are away from one.
Because it is all local, the tool is as fast as your device and as private as your own notes.
The sections that follow cover the fields, the method, and one full example computed from the defaults.
What do the JSON to Dart fields mean?
The JSON to Dart uses 2 inputs. Each input has a default that makes sense on its own, so a partial edit still gives a valid result.
| 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 class name | required | Root |
How does the JSON to Dart 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 Dart loads by default, and the result it produces from them. Here is the calculation as it stands the moment the page loads.
| JSON | { "id": 42, "name": "Ada", "is_active": true, "sc… |
|---|---|
| Root class name | Root |
| Status | 3 classes generated |
|---|---|
| Dart | class Root { final int id; final String name; final bool isActive; final double score; final List<String>… |
How to use it
- Paste your content into JSON.
- Set Root class name.
- The result appears as you type. There is no button to press.
- You get Status and Dart back.
- Copy Link is the quickest way to send the exact scenario to someone else.
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.
- Nothing is saved between visits, so keep your own record of anything you need again.
Frequently asked questions
JSON and Root class name. That is the whole form. Nothing starts empty, which means a single edit is enough to get a meaningful answer.
With the values loaded when the page opens, status comes out as 3 classes generated. Any edit re-runs the calculation, so there is no stale number on screen.
It never leaves the tab. The page does the work itself rather than asking a server to.
Nothing at all. There is no registration, no paywall and no per-use quota.
Reliable for the case described. Where more than one convention exists, the method section says which one is used.