Google Health API reference

Swim Lengths Data: the Google Health API swim-lengths-data data type

Read from Google’s documentation on 2026-10-17 · discovery document revision 20261014 · Google’s data-types page last updated 2026-10-06

Swim Lengths Data (swim-lengths-data) is an Interval data type in the Google Health API. Google's data-types table lists list, reconcile, rollup and dailyRollup for it under the .activity_and_fitness.readonly and .activity_and_fitness.writeonly scopes. The table marks it with neither webhook nor true-zeros support. Google's Fitbit migration table maps the Fitbit Web API's Activity time series swimming strokes data to it.

Swim Lengths Data at a glance

From the Swim Lengths Data row of Google’s data-types table, joined to the discovery document’s DataPoint schema.

Display name: Swim Lengths Data
dataType (in endpoint URLs): swim-lengths-data
filter parameter: swim_lengths_dataGoogle: “The identifier separated by underscores (for example, active_minutes) used as the value for the dataType filter parameter in daily rollup and rollup requests.”
Record type: Interval — Google: “Represents measurements recorded over a duration.”
Storage resolution: not stated in Google’s table
Webhook support: Not marked in Google’s table
True zeros support: Not marked in Google’s table
Channel: v4
DataPoint field: DataPoint.swimLengthsData → SwimLengthsDataIts description: “Optional. Data for points in the swim-lengths-data interval data type collection.”
Compatible devices: 23 in Google’s table

Operations and request paths

The operations Google’s table lists for swim-lengths-data, each matched to its users.dataTypes.dataPoints method in the discovery document. The path is the documented path template (the method’s flatPath on https://health.googleapis.com/) with {dataTypesId} filled in as swim-lengths-data. Google on {user}: “The {user} can be either the alias me or the authenticated user's numeric Health User ID (retrieved via GetIdentity).”

Table lists	Method	Documented path template
`list`	`list`	`GET https://health.googleapis.com/v4/users/{usersId}/dataTypes/swim-lengths-data/dataPoints`
`reconcile`	`reconcile`	`GET https://health.googleapis.com/v4/users/{usersId}/dataTypes/swim-lengths-data/dataPoints:reconcile`
`rollup`	`rollUp`same name, different case	`POST https://health.googleapis.com/v4/users/{usersId}/dataTypes/swim-lengths-data/dataPoints:rollUp`
`dailyRollup`	`dailyRollUp`same name, different case	`POST https://health.googleapis.com/v4/users/{usersId}/dataTypes/swim-lengths-data/dataPoints:dailyRollUp`

Every method, and how many of the data types list it: the methods overview.

Scopes

The scopes Google’s table lists for swim-lengths-data, as full URLs, with the consent text Google’s Scopes page gives each. Every Google Health API scope.

Scope	Access	Google’s permission text
`https://www.googleapis.com/auth/googlehealth.activity_and_fitness.readonly`	read	See your Google Health activity and fitness data.
`https://www.googleapis.com/auth/googlehealth.activity_and_fitness.writeonly`	write	Add activity and fitness data to Google Health, and edit or delete the data it adds.

Fields of Swim Lengths Data

The schema the discovery document gives DataPoint.swimLengthsData, required fields first. Types are as the discovery document states them; the label is the word Google’s description opens with. The schemas its fields refer to follow, one level deep.

SwimLengthsData — Google: “Swim lengths data over the time interval.”

Field	Type	Google’s description
`interval`Required	`ObservationTimeInterval`	Required. Observed interval.
`strokeCount`Required	`string/int64`	Required. Number of strokes in the lap.
`swimStrokeType`Required	`string`	Required. Swim stroke type. `SWIM_STROKE_TYPE_UNSPECIFIED` — Swim stroke type is unspecified. `FREESTYLE` — Freestyle swim stroke type. `BACKSTROKE` — Backstroke swim stroke type. `BREASTSTROKE` — Breaststroke swim stroke type. `BUTTERFLY` — Butterfly swim stroke type.

`ObservationTimeInterval`

Google: “Represents a time interval of an observed data point.”

Field	Type	Google’s description
`endTime`Required	`string/google-datetime`	Required. Observed interval end time.
`endUtcOffset`Required	`string/google-duration`	Required. The offset of the user's local time at the end of the observation relative to the Coordinated Universal Time (UTC).
`startTime`Required	`string/google-datetime`	Required. Observed interval start time.
`startUtcOffset`Required	`string/google-duration`	Required. The offset of the user's local time at the start of the observation relative to the Coordinated Universal Time (UTC).
`civilEndTime`Output only	`CivilDateTime`	Output only. Observed interval end time in civil time in the timezone the subject is in at the end of the observed interval
`civilStartTime`Output only	`CivilDateTime`	Output only. Observed interval start time in civil time in the timezone the subject is in at the start of the observed interval

Rollup fields

`rollUp` returns `RollupDataPoint.swimLengthsData`

The discovery document: “Returned by default when rolling up data points from the swim-lengths-data data type, or when requested explicitly using the swim-lengths-data rollup type identifier.”

SwimLengthsDataRollupValue — Google: “Represents the result of the rollup of the swim lengths data type.”

Field	Type	Google’s description
`strokeCountSum`	`string/int64`	Total number of swim strokes in the interval.

`dailyRollUp` returns `DailyRollupDataPoint.swimLengthsData`

The same SwimLengthsDataRollupValue as the rollUp result above.

Fitbit Web API predecessor

Google’s Fitbit Web API → Google Health API data-type table maps Activity time series swimming strokes to swim-lengths-data.

Fitbit Web API scopes Google maps to swim-lengths-data’s scopes: activity, cardio_fitness.

Google’s full Fitbit Web API mapping tables · the migration playbook

Compatible devices

The 23 devices Google’s table lists as able to record and sync swim-lengths-data.

Fitbit Air
Fitbit Charge 3
Fitbit Charge 4
Fitbit Charge 5
Fitbit Charge 6
Fitbit Flex 2
Fitbit Inspire
Fitbit Inspire 2
Fitbit Inspire 3
Fitbit Inspire HR
Fitbit Ionic
Fitbit Luxe
Pixel Watch
Pixel Watch 2
Pixel Watch 3
Pixel Watch 4
Fitbit Sense
Fitbit Sense 2
Fitbit Versa
Fitbit Versa 2
Fitbit Versa 3
Fitbit Versa 4
Fitbit Versa Lite

Google’s documentation

Swim Lengths Data in the v4 REST reference

Related on this site

Swimming Data API: Strokes, Laps and Swim Distance by Platform — the metric on every platform this site covers, each type quoted in its platform's own words
Verification and rate limits
The Fitbit Web API turn-off

Questions

Which OAuth scopes does the Google Health API swim-lengths-data data type need?

Google's data-types table (read 2026-10-17) lists https://www.googleapis.com/auth/googlehealth.activity_and_fitness.readonly and https://www.googleapis.com/auth/googlehealth.activity_and_fitness.writeonly for swim-lengths-data. The Scopes page's consent text: .activity_and_fitness.readonly, "See your Google Health activity and fitness data."; .activity_and_fitness.writeonly, "Add activity and fitness data to Google Health, and edit or delete the data it adds."

Can apps write swim lengths data data to the Google Health API?

Not according to Google's data-types table, read 2026-10-17: it lists only list, reconcile, rollup and dailyRollup for swim-lengths-data, and no create, update or batchDelete operation.

How do you aggregate swim-lengths-data data with the Google Health API?

With the rollup methods Google's table lists for it. rollUp (POST https://health.googleapis.com/v4/users/{usersId}/dataTypes/swim-lengths-data/dataPoints:rollUp) returns RollupDataPoint.swimLengthsData, a SwimLengthsDataRollupValue with strokeCountSum; dailyRollUp (POST https://health.googleapis.com/v4/users/{usersId}/dataTypes/swim-lengths-data/dataPoints:dailyRollUp) returns DailyRollupDataPoint.swimLengthsData, a SwimLengthsDataRollupValue with strokeCountSum. Each field is described on this page as the discovery document describes it.

What did the Google Health API swim-lengths-data data type replace in the Fitbit Web API?

Google's Fitbit Web API migration table maps the Fitbit Web API's "Activity time series swimming strokes" to swim-lengths-data. The Fitbit Web API scopes Google maps to its scopes: activity and cardio_fitness.

Other activity and fitness data types

All activity and fitness data types →

Sources checked

Google Health API data types — last updated 2026-10-06 · read 2026-10-17
Google Health API discovery document (v4) — revision 20261014 · read 2026-10-17
Scopes — last updated 2026-10-09 · read 2026-10-17
API specifications — last updated 2026-09-22 · read 2026-10-17

Google’s text is quoted for identification; each guide page’s footer reads: “Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License.”. Generated from Google’s pages by scripts/fetch-google-health-api.mjs, not typed by hand; Google’s documentation remains the authority.

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