Obsidian Quick Capture using templater. Activate from anywhere in your vault to record quick ideas, notes, time logging, etc. The Quick Capture file does NOT need to be open.

obsidian.templater.quick-capture.js

<%*
//v1.4: Adding option for including a header for each DNP day to fold

//'first' will add to top of file. 'last' will add to bottom of file
let firstOrLastLine = 'first';

//Name of the Quick Capture file. Do NOT include extension '.md'
let qcFileName = 'Quick Capture';

//Leave this blank if you want to use the default file path location (set to '/' to use root of vault)
let folderOverride = '';

//Add a header for each day to nest the quick capture notes under (only works when firstOrLastLine = 'first')
let bAddHeader = false;

let curDateFormat = '[' + '[' + tp.date.now("YYYY-MM-DD") + ']]';
let finalTimestamp = curDateFormat;
let curTimeFormat = tp.date.now("hh:mm A");
if(curTimeFormat != ''){finalTimestamp = finalTimestamp + ' ' + curTimeFormat}

let qcFolderLocation;
if(folderOverride) {
    qcFolderLocation = folderOverride;
} else {
    if(this.app.vault.config.newFileLocation != 'current') {
        qcFolderLocation = this.app.fileManager.getNewFileParent().path;
    } else {
        qcFolderLocation = '/';
    }
}
if(qcFolderLocation != ''){qcFolderLocation = qcFolderLocation + '/'}
qcFolderLocation = qcFolderLocation.replace(/\/\//g,'/');
if(qcFolderLocation == '/'){qcFolderLocation = ''}
if(qcFolderLocation.startsWith('/')){qcFolderLocation = qcFolderLocation.substring(1)}

let qcFilePath = qcFolderLocation + qcFileName + '.md';
let qcFile = this.app.vault.getAbstractFileByPath(qcFilePath);
if(!qcFile) {
    qcFile = await this.app.vault.create(qcFilePath, '');
}

if(qcFile) {
    let qcNote = await tp.system.prompt("Enter a Quick Capture note");
    let isTodo = qcNote.startsWith(';');
    let finalNote = (isTodo ? '- [ ] ' : '') + finalTimestamp + ' - ' + (isTodo ? qcNote.substring(1) : qcNote);
    let curContent = await this.app.vault.read(qcFile);
    let newContents;
    if(firstOrLastLine == 'last'){newContents = curContent + '\n' + finalNote}
    else {
        if(bAddHeader) {
            let curDateHeader = '# ' + curDateFormat;
            curContent = curContent.replace('\n' + curDateHeader + '\n\n', '');
            newContents = '\n' + curDateHeader + '\n\n' + finalNote + '\n' + curContent;
        } else {
            newContents = finalNote + '\n' + curContent
        }
    }
    this.app.vault.modify(qcFile, newContents);
}
%>

Hi. How can i quick capture an idea to my today - daily note? thank you.

Please use the QuickAdd plugin instead of this script. This is old. The QuickAdd plugin allows you to do this and so much more and has good documentation.