How to use JSON.parse() correctly using Express (Node.js)?

Question

I am new to Express and I wonder whether I can parse some property before sending the response to the frontend. The response would be an array of objects. In each object there are properties that includes JSON objects which are stringified. I want to parse them before sending them to the frontend.

Would I iterate through the response and use JSON.parse() on all properties which are stringified in the backend or would I have to handle them in my frontend?

Here is my code:

  router.get('/posts', function (req, res) {
    db.query(
      'select * from posts;',
      [10*(req.params.page || 0)],
      (error, results) => {
        if (error) {
          console.log(error);
          res.status(500).json({status: 'error'});
        } else {
          res.status(200).json(results);
        }
      }
    );
  });

Charanjeet Singh · Accepted Answer · 2020-05-26 08:10:33Z

1

Example given below Parsing a file containing JSON data.But you can use as per your requirement on your result set.

Asynchronous version

var fs = require('fs');

fs.readFile('/path/to/file.json', 'utf8', function (err, data) {
    if (err) throw err; // we'll not consider error handling for now
    var obj = JSON.parse(data);
});

Synchronous version

var fs = require('fs');
var json = JSON.parse(fs.readFileSync('/path/to/file.json', 'utf8'));

OR

const json = '{"result":true, "count":42}';
const obj = JSON.parse(json);

Hope this will help you to parse your result set to JSON.

answered May 26, 2020 at 8:10

Charanjeet Singh

3101 silver badge6 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to use JSON.parse() correctly using Express (Node.js)?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related