# Get JSON Value with Dynamic Key in TypeScript

Small and hopefully helpful snippet.

### Problem Scenario

We have `Car` data in JSON with an on going updates. `modelyear` will be added regularly. We wanted to output model description base on year input by user on a form.

### Solution

Convert input to key for lookup

```typescript
// Get JSON Value with dynamic key
const vehicle = {
    "category": "car",
    "brand": "SupaDupa",
    "modelYear": {
        "2000": "SD-S",
        "2020": "SD-M",
        "2030": "SD-A",
        "2040": "SD-R",
        "2050": "SD-T"
        }
}
type ObjectKey = keyof typeof vehicle.modelYear;
const year = '2020' as ObjectKey // set value of dynamic key
console.log(vehicle.modelYear[year])
```

See REPL snippet [here](https://www.typescriptlang.org/play?#code/PTAEHEFMBdQKQMoHkByoBqBDANgV0qAO4CW0AFqACYCeAdpgLbEDGoA1pNQFDMD2tAZ1gA3SGRbYCAXlABvLqEWgARM0zRIAc14AnasoBcKtTuUAaBUuUAjHZlqVDKhLgAOmACJvM5y4uUMvJSQ2ACakJimRvJKsSoATAAMyU7KCB4AtAi+cVZJSanpGQCyObkJiQDMiYWZAIJlucpJACw1RmmZAEqNcc2JAKztzpkAKsp+cQC+XDPQ1K4ESNYAVpDM0ADSnKAyHNS8AGag84tHoKLizJIAdIHBYRE6ANw8-EKg1E+7oADk+YlfqBMAJQMs1htttRQCBQAIYBccPhQOcaPQmKx9m9BLxbtheJoABSXCSQO5BELhSIAbS+kQAugBKLhAA)