'Google REST API - message in an RFC 2822 formatted and base64url encoded string

I try the use the - try it of Google REST API - Users.messages: send .

There is there a required parameter - raw -

The entire email message in an RFC 2822 formatted and base64url encoded string. Returned in messages.get and drafts.get responses when the format=RAW parameter is supplied.

I checked about RFC 2822 format and seems it should displayed as the sample here , then I encoded it the base64URL with this encoder and paste it the raw field of the try it and I get - Invalid value for ByteString: http://ostermiller.org/calc/encode.html .

Can you provide me a correct RFC 2822 format and its corresponding base64URL which it would work in the above try it ?

Solution 1:^[1]

you can use this in node REPL or online node compiler and get the json

function createMessageJson(){
    const messages = [
        'From: NAME <[email protected]>',
        'To: Name <[email protected]>',
        'Content-Type: text/html; charset=utf-8',
        'MIME-Version: 1.0',
        'Subject: Re: SUBJECT',
        '',
        'BODY_TEXT',
        '',
    ];


    function encodedMessage (){
        return Buffer.from(messages.join('\n'))
            .toString('base64')
            .replace(/\+/g, '-')
            .replace(/\//g, '_')
            .replace(/=+$/, '');
    }


  return JSON.stringify({
            raw: encodedMessage()
    });
}

console.log(createMessageJson())

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'Google REST API - message in an RFC 2822 formatted and base64url encoded string

Solution 1:[1]

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Solution 1:^[1]