How to access the request body when POSTing using Node js and Express

Question

I have the following Node js code   var express   require  express    var app   express createServer express logger     app use express bodyParser      app post      function request  response        response write request body user       response end          Now if I POST something like   curl -d user Someone -H Accept application json --url http   localhost 5000   I get Someone as expected  Now  what if I want to get the full request body  I tried doing response write request body  but Node js throws an exception saying  first argument must be a string or Buffer  then goes to an  infinite loop  with an exception that says  Can t set headers after they are sent    this also true even if I did var reqBody   request body  and then writing response write reqBody    What s the issue here   Also  can I just get the raw request without using express bodyParser

User · Answer

You use the following code to log post data   router post   users  function req res       res send JSON stringify req body  null  4

User · Answer

var express   require  express    var bodyParser   require  body-parser    var app   express    app use bodyParser urlencoded   extended  false      app use bodyParser json     var port   9000   app post   post data   function req  res        console log  receiving data           console log  body is   req body       res send req body           start the server app listen port   console log  Server started  At http   localhost     port     This will help you  I assume you are sending body in json

User · Answer

What you claim to have  tried doing  is exactly what you wrote in the code that works  as expected  when you invoke it with curl   The error you re getting doesn t appear to be related to any of the code you ve shown us   If you want to get the raw request  set handlers on request for the data and end events  and  of course  remove any invocations of express bodyParser     Note that the data events will occur in chunks  and that unless you set an encoding for the data event those chunks will be buffers  not strings

User · Answer

This can be achieved without body-parser dependency as well  listen to request data and request end and return the response on end of request  refer below code sample  ref https   nodejs org en docs guides anatomy-of-an-http-transaction  request-body  var express   require  express    var app   express createServer express logger      app post      function request  response            push the data to body     var body           request on  data    chunk    gt          body push chunk          on  end        gt             on end of data  perform necessary action       body   Buffer concat body  toString          response write request body user         response end

User · Answer

In my case  I was missing to set the header   quot Content-Type  application json quot

User · Answer

Install Body Parser by below command    npm install --save body-parser   Configure Body Parser  const bodyParser   require  body-parser    app use bodyParser   app use bodyParser json       Make sure u have added this line app use bodyParser urlencoded   extended  false

User · Answer

I m absolutely new to JS and ES  but what seems to work for me is just this   JSON stringify req body    Let me know if there s anything wrong with it

User · Answer

Try this   response write JSON stringify request body      That will take the object which bodyParser has created for you and turn it back into a string and write it to the response  If you want the exact request body  with the same whitespace  etc   you will need data and end listeners attached to the request before and build up the string chunk by chunk as you can see in the json parsing source code from connect

User · Answer

As of Express 4  the following code appears to do the trick  Note that you ll need to install body-parser using npm   var express   require  express    var bodyParser   require  body-parser    var app   express    app use bodyParser urlencoded   extended  false        app listen 8888    app post   update   function req  res        console log req body      the posted data

User · Answer

For 2019  you don t need to install body-parser   You can use   var express   require  express    var app   express    app use express json    app use express urlencoded  extended  true    app listen 8888   app post   update   function req  res        console log req body      the posted data

User · Answer

If you re lazy enough to read chunks of post data  you could simply paste below lines  to read json   Below is for TypeScript similar can be done for JS as well   app ts   import bodyParser from  body-parser       support application json type post data  this app use bodyParser json         support application x-www-form-urlencoded post data  this app use bodyParser urlencoded   extended  false        In one of your any controller which receives POST call use as shown below  userController ts   public async POSTUser  req  Request   res  Response       try             const onRecord    lt UserModel gt  req body                Your business logic                res status 201  send  User Created                  else              res status 500  send  Server error                                     req body should be parsing you json data into your TS Model

User · Answer

Starting from express v4 16 there is no need to require any additional modules  just use the built-in JSON middleware   app use express json      Like this   const express   require  express    app use express json           lt      parse request body as JSON  app listen 8080   app post   test    req  res    gt      res json  requestBody  req body        lt      req body will be a parsed JSON object      Note - body-parser  on which this depends  is already included with express   Also don t forget to send the header Content-Type  application json

User · Answer

Express 4 0 and above     npm install --save body-parser  And then in your node app   const bodyParser   require  body-parser    app use bodyParser       Express 3 0 and below   Try passing this in your cURL call   --header  Content-Type  application json   and making sure your data is in JSON format     user   someone    Also  you can use console dir in your node js code to see the data inside the object as in the following example   var express   require  express    var app   express createServer     app use express bodyParser      app post      function req  res       console dir req body       res send  test          app listen 3000     This other question might also help  How to receive JSON in express node js POST request   If you don t want to use the bodyParser check out this other question  https   stackoverflow com a 9920700 446681

[javascript] How to access the request body when POSTing using Node.js and Express?

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