Catch express bodyParser error

Question

I want to catch the error from the bodyParser() middleware when I send a json object and it is invalid because I want to send a custom response instead of a generic 400 error. This is what I have and it works: ``` app.use (express.bodyParser ()); app.use (function (error, req, res, next){ //Catch bodyParser error if (error.message === "invalid json"){ sendError (res, myCustomErrorMessage); }else{ next (); } }); ``` But this seems to me a very ugly approach because I'm comparing the error message which could change in future express versions. There's any other way to catch bodyParser() errors? EDIT: This is the error when the request body has an invalid json: ``` { stack: 'Error: invalid json at Object.exports.error (/node_modules/express/node_modules/connect/lib/utils.js:55:13) at IncomingMessage. (/node_modules/express/node_modules/connect/lib/middleware/json.js:74:71) at IncomingMessage.EventEmitter.emit (events.js:92:17) at _stream_readable.js:872:14\…

Accepted Answer

Ok, found it:

bodyParser() is a convenience function for json(), urlencoded() and multipart(). I just need to call to json(), catch the error and call to urlencoded() and multipart().

bodyParser source

```
app.use (express.json ());
app.use (function (error, req, res, next){
    //Catch json error
    sendError (res, myCustomErrorMessage);
});

app.use (express.urlencoded ());
app.use (express.multipart ());
```

Catch express bodyParser error

Solution

Problem