Is there a way to dynamically modify the email content with the Gmail API using JavaScript?

I have received the message body and now I need to make some updates to it. When I try using this login/code, I encounter a 400 error. I believe the issue lies in the body parameter of the request. Can someone please assist me with this?

var token = localStorage.getItem("accessToken");

var messageId = "18514426e2b99017";


        async function updateMessageContent() {
var updatedBody = "Hello,\n\nThis is the UPDATED message content.\n\nBest wishes,\nJohn";
          const API_KEY = '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-CXIk';
          const headers = {
            'Authorization': `Bearer ${token}`,
            'Content-Type': 'application/json'
          };

          const response = await fetch(`https://gmail.googleapis.com/gmail/v1/users/me/messages/18514426e2b99017/modify?key=['API_KEY']`, {
            method: 'POST',
            headers: headers,
            body: JSON.stringify({
              raw: window.btoa(unescape(encodeURIComponent(updatedBody)))
            })
          });

          if (!response.ok) {
            // throw new Error(`Request failed with status code ${response.status}`);
          }

          return await response.json();
        }

    updateMessageContent()
  .then(response => {
    console.log('Message content updated successfully:', response);
  })
  .catch(error => {
  });
 

Answer №1

After carefully reviewing the documentation, it is clear that once an email message is created, its body cannot be altered. The documentation provides more details on this limitation.

https://i.sstatic.net/ZeDiP.png

If you intend to make changes to a message, consider working with a message draft instead. Attempting to modify a created email using your current code endpoint will not work and result in the error message you are encountering. I recommend utilizing the users.draft.update method to edit the content of drafts stored in your mailbox. Keep in mind that the users.messages methods lack an update function; only the modify method for updating labels is available through those endpoints.

https://i.sstatic.net/fBRXU.png

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