Manish Jangir Manish Jangir - 6 months ago 19
Node.js Question

Accept Only JSON Content Type In A Post or Put Request In ExpressJS

I'm working with ExpressJS framework to create REST APIs. All the APIs should accept only JSON request body for POST, PUT and PATCH type of request methods.

I'm using express.bodyParser module to parse JSON body. It works perfectly fine.

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());


If there is any syntax error in my JSON body, my last error handler middleware is perfectly called and I can customize the response as
400 Bad Request
.

But, if I pass the content type anything rather than
application/json
like
(text/plain,text/xml,application/xml)
, the body parser module parses it without error and my error handler middleware is not called in this case.

My last error handler middleware:

export default function(error, request, response, next) {
if(error.name == 'SyntaxError') {
response.status(400);
response.json({
status: 400,
message: "Bad Request!"
});
}
next();
}


What I want to do is call my last error handler middle in case of the content type is not
applicaition/json
.

Answer

To do this you just need to you use type option from bodyparser.json configuration options

app.use(bodyParser.json({
    type: function() {
        return true;
    }
}));

alternative could be using wildcard

app.use(bodyParser.json({
    type: "*/*"
}));