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Metadata

You can add key-value pairs to certain objects to store data against them.

Create, read, update, and delete metadata on the following objects:

  • Events
    • Existing events
    • New events
    • Recurring calendar events
  • Calendar
    • New and existing calendars
  • Messages
    • Creating and updating messages
  • Send
    • Sending a message directly
  • Drafts
    • Creating and updating drafts

Metadata Object

The metadata object is made of a list of key-value pairs.

  • Keys - A key can be any string. You are allowed up to 40 characters per key.
  • Value - A value can be any string. You are allowed up to 500 characters per value.

In total, you can 50 key-value pairs per object. You cannot nest metadata objects.

...
    "metadata":{
        "hi": "6",
        "event-type" : "party"
    }

Adding Metadata

The following example creates a new calendar and adds the "event-type": "gathering" key/value pair to the metadata object. Metadata works the same across events and calendars.

curl --request POST \
  --url https://api.nylas.com/calendars \
  --header 'Accept: application/json' \
  --header 'Authorization: Bearer <ACCESS_TOKEN>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "My New Calendar",
  "description": "Description of my new calendar",
  "location": "Location description",
  "timezone": "America/Los_Angeles",
  "metadata": {
    "event-type": "gathering"
  }
}'

Delete Metadata

You can overwrite the value of a key by passing in an empty string. Key-value pairs on events can only be removed through PUT requests that omit that key-value pair.

Update an existing event with a PUT request.

"metadata":{
 "internal_event_id": ""
}

Key-Value Limit

Since the key with an empty string value persists, it will still count against your limit of 50 key-value pairs.

Query Metadata

You can query your added metadata. Using the following metadata object as an example:


   "metadata": {
       "goodmorning": "goodnight",
       "green": "sour-apple",
       "hello": "goodbye"
   },

To query for keys, use:

  • https://api.nylas.com/events?metadata_key=goodmorning
  • https://api.nylas.com/calendar?metadata_key=green

To query for values, use:

  • https://api.nylas.com/calendar?metadata_value=goodnight
  • https://api.nylas.com/events?metadata_value=sour-apple

To query for multiple keys and values use:

  • https://api.nylas.com/calendar?metadata_pair=goodmorning:goodnight
  • https://api.nylas.com/events?metadata_pair=goodmorning:goodnight&metadata_pair=hello:goodbye

To return any object with metadata:

  • https://api.nylas.com/calendar?metadata_search=any

To return all keys that match hello and welcome:

  • https://api.nylas.com/calendar?metadata_search=all&metadata_key=hello&metadata_key=welcome

To return values that do not match goodnight:

  • https://api.nylas.com/events?metadata_search=none&metadata_value=goodnight

You can combine the filters for targeted searching.

No match

If there is no match, the API returns a 200 OK with [] as a result.

Recurring Events

Recurring events are made of a primary event, with child events or the recurrence attached.

  • You can add metadata to the primary event.
  • Metadata is not attached to child events.
  • The filter expand_recurring=true does not work with recurring events that have metadata.
  • If you change an event from non-recurring to recurring, any metadata on the non-recurring event is lost.

Keep in Mind

  • Number of key-value pairs per object: 50
  • Number of characters per key: 40
  • Number of characters in the value: 500
  • Not able to nest metadata objects
  • Webhooks are not supported when event metadata is updated. When an event is created an event.created webhook will fire.