res.json([body])

发送 JSON 响应。此方法发送一个响应（具有正确的内容类型），该响应是使用 JSON.stringify() 转换为 JSON 字符串的参数。

Sends a JSON response. This method sends a response (with the correct content-type) that is the parameter converted to a JSON string using JSON.stringify().

WhKMPwEagFMigcMkWfUC9IColPIFi1NMSgNWg0u5WFGxGegsU0TSdzRZQ67nZ/nSvr9F+n6ZEqQwa9aKXLAVwxwH+BzHP+qc2mLyLlO2d0uy9KvossjlzdsN+T3w3wk022V796hEZp9VGkfeTODl9BKxFHOWwmGJSgHCnJiqvw4GkOMJ6nLybGlUtVrXpUnh4SAJ4Rc08qai5GTkTaDEeSchrLwY21vqrbptPm6a+snG0/PqFaqko//VqsR0vWcKwmikxwkLx0xml3TJsD0qO315451wDvXI5jN8TuvngEnjRMK1opVL5Pxbs2YNEbDA4pkl4gZuVT/3Fn1ysSqfwztDXEuuhl3eGPBz/IJWHqBCOtNK9NLuTfoKEpb0PGoTDz/Xygy3H/EyMRwbSKxRujuwSEppQTWAj9cYQVg5/s/oDAHBdpq9OMsrA/mXndVC

res.json(null)
res.json({ user: 'tobi' })
res.status(500).json({ error: 'message' })