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1.6 KiB
Fetch data
Concepts
- Like browsers, Deno implements web standard APIs such as fetch.
- Deno is secure by default, meaning explicit permission must be granted to access the network.
- See also: Deno's permissions model.
Overview
When building any sort of web application developers will usually need to
retrieve data from somewhere else on the web. This works no differently in Deno
than in any other JavaScript application, just call the the fetch()
method.
For more information on fetch read the
MDN documentation.
The exception with Deno occurs when running a script which makes a call over the
web. Deno is secure by default which means access to IO (Input / Output) is
prohibited. To make a call over the web Deno must be explicitly told it is ok to
do so. This is achieved by adding the --allow-net
flag to the deno run
command.
Example
Command: deno run --allow-net fetch.ts
/**
* Output: JSON Data
*/
const json = fetch("https://api.github.com/users/denoland");
json.then((response) => {
return response.json();
}).then((jsonData) => {
console.log(jsonData);
});
/**
* Output: HTML Data
*/
const text = fetch("https://deno.land/");
text.then((response) => {
return response.text();
}).then((textData) => {
console.log(textData);
});
/**
* Output: Error Message
*/
const error = fetch("https://does.not.exist/");
error.catch((error) => console.log(error.message));