title: Setting compression level in node zlib
body: <p>How do I force zlib to use compression level 9.
  <a href="https://nodejs.org/dist/latest/docs/api/zlib.html" rel="nofollow noreferrer">https://nodejs.org/dist/latest/docs/api/zlib.html</a></p>
  
  <p>I need to set this since the browser side decompression file base64 encoded string compressed in level 9.
  <a href="http://jsxgraph.uni-bayreuth.de/wp/jsxcompressor.html" rel="nofollow noreferrer">http://jsxgraph.uni-bayreuth.de/wp/jsxcompressor.html</a></p>