Express Response JSON – onlinecode
In this post, we will give you information about Express Response JSON – onlinecode. Here we will give you detail about Express Response JSON – onlinecode And how to use it also give you a demo for it if it is necessary.
Express response objects have a json()
function. The res.json()
function takes a single parameter,
an object obj
, serializes it to JSON, and sends it in the HTTP response body.
const axios = require('axios');
const express = require('express');
const app = express();
app.get('*', function(req, res) {
res.json({ answer: 42 });
});
const server = await app.listen(3000);
const response = await axios.get('http://localhost:3000');
response.data; // { answer: 42 }
response.headers['content-type']; // 'application/json; charset=utf-8'
Express also sets the content-type
header to application/json
. Most HTTP clients, like Axios, handle automatically transforming JSON
strings into JavaScript objects using JSON.parse()
when the content type is application/json
.
The res.json()
uses JSON.stringify()
under the hood to serialize objects into JSON. You can configure the arguments that Express passes
to JSON.stringify()
using app.use()
. For example, to make Express pretty print JSON, you can use app.set('json spaces', 2)
as shown below.
const axios = require('axios');
const express = require('express');
const app = express();
// Make Express pass '2' as the 3rd argument to 'JSON.stringify()'
app.set('json spaces', 2);
app.get('*', function(req, res) {
res.json({ answer: 42, hello: 'world' });
});
const server = await app.listen(3000);
const response = await axios.get('http://localhost:3000', {
transformResponse: res => res // Disable automatic JSON parsing
});
// {
// "answer": 42,
// "hello": "world"
// }
response.data;
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Espresso supports:
- Route handlers, like ‘app.get()’ and ‘app.post()’
- Express-compatible middleware, like ‘app.use(require(‘cors’)())’
- Express 4.0 style subrouters
As a bonus, Espresso also supports async functions, unlike Express.
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I need more information on what you are looking for. Here are a few options for what you might mean by ‘express’:
- Express train: A train that makes fewer stops than a regular train, and therefore travels faster.
- Express delivery: A service that delivers packages quickly, usually within 24 hours.
- Express yourself: To communicate your thoughts and feelings in a clear and direct way.
- Express lane: A lane on a highway that is reserved for cars that are traveling faster than the other lanes.
- Expresso: A strong, concentrated coffee.
Please let me know if any of these are what you were looking for. If not, please provide more information so I can better assist you.
Here are some examples of how to use the word ‘express’ in a sentence:
- I took the express train to work today.
- I ordered the package to be delivered express.
- She expressed her anger by slamming the door.
- The express lane was moving much faster than the other lanes.
- I love the strong taste of espresso.
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