How do I consume the JSON POST data in an Express application

by

I think you’re conflating the use of the response object with that of the request.

The response object is for sending the HTTP response back to the calling client, whereas you are wanting to access the body of the request. See this answer which provides some guidance.

If you are using valid JSON and are POSTing it with Content-Type: application/json, then you can use the bodyParser middleware to parse the request body and place the result in request.body of your route.

Update for Express 4.16+

Starting with release 4.16.0, a new express.json() middleware is available.

var express = require('express');

var app = express();

app.use(express.json());

app.post("https://stackoverflow.com/", function(request, response){
  console.log(request.body);      // your JSON
   response.send(request.body);    // echo the result back
});

app.listen(3000);

Updated for Express 4.0 – 4.15

Body parser was split out into it’s own npm package after v4, requires a separate install npm install body-parser

var express = require('express')
  , bodyParser = require('body-parser');

var app = express();

app.use(bodyParser.json());

app.post("https://stackoverflow.com/", function(request, response){
  console.log(request.body);      // your JSON
   response.send(request.body);    // echo the result back
});

app.listen(3000);

For earlier versions of Express (< 4)

var express = require('express')
  , app = express.createServer();

app.use(express.bodyParser());

app.post("https://stackoverflow.com/", function(request, response){
  console.log(request.body);      // your JSON
  response.send(request.body);    // echo the result back
});

app.listen(3000);

Test along the lines of:

$ curl -d '{"MyKey":"My Value"}' -H "Content-Type: application/json" http://127.0.0.1:3000/
{"MyKey":"My Value"}

More Related Contents:

  1. Proper way to return JSON using node or Express
  2. pass JSON to HTTP POST Request
  3. Create JSON from a String
  4. is there a require for json in node.js
  5. How to update a value in a json file and save it through node.js
  6. How can I pretty-print JSON using node.js?
  7. How to convert CSV to JSON in Node.js
  8. express.json vs bodyParser.json
  9. Convert Mongoose docs to json
  10. How do I add environment variables to launch.json in VSCode
  11. Is there a way to automatically build the package.json file for Node.js projects
  12. Node.js -Firebase Service Account Private Key won’t parse
  13. Unable to send numbers using res.send() using express with node
  14. node.js readfile error with utf8 encoded file on windows
  15. How do I get ASP.NET Web API to return JSON instead of XML using Chrome?
  16. Using Node.JS, how do I read a JSON file into (server) memory?
  17. Flatten aggregated key/value pairs from a JSONB field?
  18. Mongoimport of JSON file
  19. How to parse a complicated JSON with Go unmarshal?
  20. Proper formating of JSON using powershell
  21. Angular: ‘Cannot find a differ supporting object ‘[object Object]’ of type ‘object’. NgFor only supports binding to Iterables such as Arrays’
  22. 502 Bad Gateway Deploying Express Generator Template on Elastic Beanstalk
  23. JSON parse error: Can not construct instance of java.time.LocalDate: no String-argument constructor/factory method to deserialize from String value
  24. Does Express.js support sending unbuffered progressively flushed responses?
  25. Node + Express + Passport: req.user Undefined
  26. Error “npm WARN package.json: No repository field”
  27. Model.find() returns empty in mongoose [duplicate]
  28. How to organise file structure of backend and frontend in MERN
  29. express.js – how to intercept response.send() / response.json()
  30. How to limit upload file size in express.js

Leave a Comment