response payload missing last character

authRouter.post("/checkEmail", async (req, res) => {
  try {
    const { email } = req.body;
    if (!email) {
      return res
        .status(400)
        .json({ error: "Email address is missing in the request body." });
    }
    const query = "SELECT auth.is_email_exist($1);";
    const result = await pool.query(query, [email]);
    const isEmailExist = result.rows[0].is_email_exist;
    res.json(isEmailExist);
    console.log(isEmailExist);
  } catch (err) {
    console.error("Error checking email:", err);
    res.status(500).json({ error: err.message });
  }
});

This post request always gives the correct response but the request gets blocked as the response last character always gets ommitted and it is only happening with this request

I have set the content header encoding to UTF8