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Document fixed_booleans_in_json compatibility option #645

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Merged
benitav merged 3 commits into from
Oct 12, 2026
Merged

Document fixed_booleans_in_json compatibility option #645

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4520a1e
Document `fixed_booleans_in_json` compatibility option
simolus3 Sep 15, 2026
fcc0d7a
Apply batched suggestions from code review
simolus3 Oct 12, 2026
aaeb330
Address Claude feedback
benitav Oct 12, 2026
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1 change: 1 addition & 0 deletions .github/vale/config/vocabularies/PowerSync/accept.txt
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Expand Up @@ -10,6 +10,7 @@ backpressure
baz
binlog
bitwise
booleans
bundler
bundlers
cardinalities
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14 changes: 13 additions & 1 deletion sync/advanced/compatibility.mdx
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Expand Up @@ -105,7 +105,8 @@ This table lists all fixes currently supported:
| `versioned_bucket_ids` | [Link](#versioned_bucket_ids) | 1.15.0 | 2 |
| `fixed_json_extract` | [Link](#fixed_json_extract) | 1.15.0 | 2 |
| `custom_postgres_types` | [Link](#custom_postgres_types) | 1.15.3 | 2 |
| `unstable_sqlite_expression_engine` | [Link](#unstable_sqlite_expression_engine). | 1.22.0 | None (unstable) |
| `fixed_booleans_in_json` | [Link](#fixed_booleans_in_json) | 1.27.0 | None |
| `unstable_sqlite_expression_engine` | [Link](#unstable_sqlite_expression_engine) | 1.22.0 | None (unstable) |

### `timestamps_iso8601`

Expand Down Expand Up @@ -180,6 +181,17 @@ With this fix applied:
```
- Multi-ranges sync as an array of ranges.

### `fixed_booleans_in_json`

Most source databases supported by PowerSync have a dedicated type for boolean values. SQLite does not. It represents booleans as the integers `0` and `1` by convention. For boolean columns, PowerSync correctly translates values to integers.

Booleans can also appear in nested structures, e.g. in JSON objects or arrays, or plain Postgres composite types, ranges and arrays. These are synced as JSON, which supports boolean literals. Without this option, the Service maps boolean values embedded in such structures to integers.

Enabling this option makes the Service preserve booleans in JSON structures. For instance, a MongoDB document field `settings: { notifications: true }` syncs as:

- `{"notifications":1}` with the option disabled.
- `{"notifications":true}` with the option enabled.

### `unstable_sqlite_expression_engine`

<Danger>
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