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

Issue

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

Answered By – Omal Perera

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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