[javascript] node.js TypeError: path must be absolute or specify root to res.sendFile [failed to parse JSON]

this configuration in app.js worked fine for me :

    //production mode
if (process.env.NODE_ENV === "production") {
  app.use(express.static(path.join(__dirname, "client/build")));
  app.get("*", (req, res) => {
    res.sendFile(path.join((__dirname + "/client/build/index.html")));

  });
}

//build mode
app.get("*", (req, res) => {
  res.sendFile(path.join(__dirname + "/client/public/index.html"));

});

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