## Example queries
Human API lets you query a user's health data with a `Bearer` token authorization header. For details on how to authorize users and retrieve these tokens please click [here](🔗).
Bearer token:
The `
demo` access token will serve [demo user data](🔗). Replace it with a valid `accessToken` to get data for that specific user.
## Media types
Human API uses JSON (JavaScript Object Notation) for all payloads. To accommodate for this:
Set the **Accept Header** to `
application/json` when querying data.Set the **Content-Type Header** to `
application/json` when sending data.
## API versions
Different versions of Human API can be used by specifying the version number in the url, i.e.` /v1`:
## Query options
The standard query options for Human API are as described in the table below. These parameters make it easier for you to implement smart synchronization for your application. For instance, by using the `updated_since` parameter you only retrieve the data that was changed or added since the specified time.
| Parameter | Description |
`limit` | The max number of records to return in one query. _Default is 50. Maximum is 500 if set._ |
`offset` | The index of the first record to return. _Default is 0_ |
`created_since` | Returns records that are created after the specified date. |
`updated_since` | Returns records that are updated after the specified date. |
`created_before` | Returns records that are created before the specified date. |
`updated_before` | Returns records that are updated before the specified date. |
`source` | Returns filtered data from a specific source. (Use the source ID e.g. 55a83bdc8d1eb1420aa1a71b) |
All dates are in UTC date format: YYYYMMDDTHHmmssZ
## Date ranges
In addition to the parameters listed above, you can also query by a date range. These parameters must be used together.
| Parameter | Description |
`start_date` | The oldest date to retrieve. _Format YYYY-MM-DD_ |
`end_date` | The most recent date to retrieve. _Format YYYY-MM-DD_ |
Date filtering for medical data
If you wish to use "start_date" and "end_date" query parameters to help filter medical data, [this reference](🔗) will indicate which response properties will be filtered against.
## Retrieving lists of objects vs a single object
Medical data includes any data from the [Medical API endpoints](🔗).
To retrieve a list of periodic data objects:
To retrieve a single object by ID:
## Pagination conventions
To make it easier to retrieve all the data for a user you can iterate through their historical data using the `Link Header` and, optionally, the `X-Total-Count Header`. The Link Header contains the first, prev, next, and last links that will help you easily iterate through all the records available for a query. The Link Header follows the [RFC5988 standard](🔗).
For example, if you query a user with the following parameters:
Your response headers would return like this:
There is also a total count for the query stored in the X-Total-Count Header: