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node.jsexpressnpmresponsesend

What is the difference between res.send and res.write in express?

I am a beginner to express.js and I am trying to understand the difference between res.send & res.write ?

Solution

  • res.send

    • res.send is only in Express.js.
    • Performs many useful tasks for simple non-streaming responses.
    • Ability to automatically assigns the Content-Length HTTP response header field.
    • Ability to provides automatic HEAD & HTTP cache freshness support.
    • Practical explanation
      • res.send can only be called once, since it is equivalent to res.write + res.end()
      • Example: 
        app.get('/user/:id', function (req, res) {
    res.send('OK');
});

    For more details:

    res.write

    • Can be called multiple times to provide successive parts of the body.
    • Example: 
      response.write('<html>');
response.write('<body>');
response.write('<h1>Hello, World!</h1>');
response.write('</body>');
response.write('</html>');
response.end();

    For more details: