[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Query](https://evolu.dev/docs/api-reference/common/local-first/Query) › evoluJsonBuildObject

```ts
function evoluJsonBuildObject<O>(
  obj: O,
): RawBuilder<
  Simplify<{
    [K in string | number | symbol]: O[K] extends Expression<V> ? V : never;
  }>
>;
```

Defined in: [packages/common/src/local-first/Query.ts:196](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/local-first/Query.ts#L196)

An improved Evolu version of Kysely's SQLite `jsonBuildObject` helper.

Kysely's `ParseJSONResultsPlugin` heuristically parses any result string that
looks like JSON. Evolu instead prefixes JSON produced by these helpers with a
per-runtime identifier and only parses values carrying that prefix, avoiding
accidental parsing of ordinary string columns that merely happen to start
with `{` or `[`.

### Example

```ts

const result = await db
  .selectFrom("person")
  .select((eb) => [
    "id",
    evoluJsonBuildObject({
      first: eb.ref("first_name"),
      last: eb.ref("last_name"),
      full: kyselySql<string>`first_name || ' ' || last_name`,
    }).as("name"),
  ])
  .execute();

result[0]?.id;
result[0]?.name.first;
result[0]?.name.last;
result[0]?.name.full;
```