String Identifier (SID)

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A String Identifier (SID) is a unique key that is used to identify specific resources.

String Identifiers at Twilio

Every Twilio resource has a 34 digit SID. You can use the first two characters of the SID to identify its type. Many of our API calls will return a JSON object containing another resource’s SID. Using this SID, you can retrieve more information about the specific resource.

For example, the following code creates an SMS message:

        
        
        

        Create a new text message

        Note how the newly created message has a property named sid. Using this value we can later fetch this specific message.

              
              
              

              Fetch a Message by SID

              Using the message SID, which is prefixed with MM, we were able to get more information about that specific resource.

              Common SID Prefixes

              Twilio’s product offering is expansive. Products range from Voice and video, Messaging, chatbots, Internet of Things connectivity, and security. Therefore, you’ll encounter many resources along your journey.

              Below is a table of the most commonly-seen SID prefixes:

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