Returning JSON in Koa

Question

I receive JSON by POST method in my router which I then return to the user. For some reason the returned JSON will have all numerical and boolean values casted to string. I am using koa-bodyparser if thats relevant.

Is there any way to avoid this?

Code:

var js = ctx.request.body.json;
ctx.body = {
                status: 'success',
                json: js
};

Input JSON:

{
"json": {
       "numbers": 123
        }
}

Output JSON:

{
"json": {
       "numbers": "123"
        }
}

Use strict mode true. Is it not helpful to you? – Hardik Shah Nov 16 '18 at 04:08 — Hardik Shah, Nov 16 '18 at 04:08
@Hardik Shah: How do I do that ? – user1217406 Nov 16 '18 at 04:18 — user1217406, Nov 16 '18 at 04:18

score 3 · Answer 1 · answered Feb 04 '19 at 20:58

Strict mode is already active by default (https://github.com/cojs/co-body#options) so you don't need to worry about it. This code works for me:

  ctx.body = {
    status: 'success',
    json: ctx.request.body.json
  };

I used Postman to send it to the koa server and received the answer in Postman which was:

  {
    "status": "success",
    "json": {
        "id": 1,
        "name": "Joe"
    }
  }

As you can see the 'id' is a number. As you did not write about your client I assume it could be the browser? If so try to use the JSON.parse() function because you may get a string from your post-request. See this example:

JSON.parse("{\"json\":{\"id\":1}}");

You can also try Postman as client and see if that works (https://www.getpostman.com/).

I used this as input in Postman: ```{ "json": { "id": 1, "name": "Joe" } }``` — Frank, Feb 04 '19 at 20:59

Returning JSON in Koa

1 Answers1