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https://github.com/camsong/fetch-jsonp
Make JSONP request like window.fetch
https://github.com/camsong/fetch-jsonp
jsonp jsonp-request polyfill
Last synced: 3 days ago
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Make JSONP request like window.fetch
- Host: GitHub
- URL: https://github.com/camsong/fetch-jsonp
- Owner: camsong
- Created: 2015-08-08T02:35:05.000Z (over 9 years ago)
- Default Branch: master
- Last Pushed: 2024-07-10T13:17:23.000Z (8 months ago)
- Last Synced: 2024-10-29T15:48:38.005Z (4 months ago)
- Topics: jsonp, jsonp-request, polyfill
- Language: JavaScript
- Homepage:
- Size: 93.8 KB
- Stars: 998
- Watchers: 26
- Forks: 157
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- Changelog: HISTORY.md
Awesome Lists containing this project
- awesome-github-star - fetch-jsonp
README
# Fetch JSONP [](https://travis-ci.org/camsong/fetch-jsonp) [](http://badge.fury.io/js/fetch-jsonp) [](https://www.npmjs.com/package/fetch-jsonp)
JSONP is NOT supported in standard Fetch API, https://fetch.spec.whatwg.org.
fetch-jsonp provides you same API to fetch JSONP like native Fetch, also comes
with global `fetchJsonp` function.
If you need a `fetch` polyfill for old browsers, try [github/fetch](http://github.com/github/fetch).
## Installation
You can install with `npm`.
```
npm install fetch-jsonp
```
## Promise Polyfill for IE
IE8/9/10/11 does not support [ES6 Promise](https://tc39.github.io/ecma262/#sec-promise-constructor), run this to polyfill the global environment at the beginning of your application.
```js
require('es6-promise').polyfill();
```
## Usage
JSONP only supports GET method, same as `fetch-jsonp`.
### Fetch JSONP in simple way
```javascript
fetchJsonp('/users.jsonp')
.then(function(response) {
return response.json()
}).then(function(json) {
console.log('parsed json', json)
}).catch(function(ex) {
console.log('parsing failed', ex)
})
```
### Set JSONP callback parameter name, default is 'callback'
```javascript
fetchJsonp('/users.jsonp', {
jsonpCallback: 'custom_callback',
})
.then(function(response) {
return response.json()
}).then(function(json) {
console.log('parsed json', json)
}).catch(function(ex) {
console.log('parsing failed', ex)
})
```
### Set JSONP callback function name, default is a random number with `json_` prefix
```javascript
fetchJsonp('/users.jsonp', {
jsonpCallbackFunction: 'function_name_of_jsonp_response'
})
.then(function(response) {
return response.json()
}).then(function(json) {
console.log('parsed json', json)
}).catch(function(ex) {
console.log('parsing failed', ex)
})
```
### Set JSONP request timeout, default is 5000ms
```javascript
fetchJsonp('/users.jsonp', {
timeout: 3000,
})
.then(function(response) {
return response.json()
}).then(function(json) {
console.log('parsed json', json)
}).catch(function(ex) {
console.log('parsing failed', ex)
})
```
### Difference between `jsonpCallback` and `jsonpCallbackFunction`
There two functions can easily be confused with each other, but there is a clear distinction.
Default values are
* `jsonpCallback`, default value is `callback`. It's the name of the callback parameter
* `jsonpCallbackFunction`, default value is `null`. It's the name of the callback function. In order to make it distinct, it's a random string with `jsonp_` prefix like `jsonp_1497658186785_39551`. Leave it blank if it's set by the server, set it explicitly if the callback function name is fixed.
##### Case 1:
```js
fetchJsonp('/users.jsonp', {
jsonpCallback: 'cb'
})
```
The request url will be `/users.jsonp?cb=jsonp_1497658186785_39551`, and the server should respond with a function like:
```js
jsonp_1497658186785_39551(
{ ...data here... }
)
```
##### Case 2:
```js
fetchJsonp('/users.jsonp', {
jsonpCallbackFunction: 'search_results'
})
```
The request url will be `/users.jsonp?callback=search_results`, and the server should always respond with a function named `search_results` like:
```js
search_results(
{ ...data here... }
)
```
### Caveats
#### 1. You need to call `.then(function(response) { return response.json(); })` in order to keep consistent with Fetch API.
#### 2. `Uncaught SyntaxError: Unexpected token :` error
More than likely, you are calling a JSON api, which does not support JSONP. The difference is that JSON api responds with an object like `{"data": 123}` and will throw the error above when being executed as a function. On the other hand, JSONP will respond with a function wrapped object like `jsonp_123132({data: 123})`.
## Browser Support
 |  |  |  | 
--- | --- | --- | --- | --- |
Latest ✔ | Latest ✔ | 8+ ✔ | Latest ✔ | 6.1+ ✔ |
# License
MIT
# Acknowledgement
Thanks to [github/fetch](https://github.com/github/fetch) for bring Fetch to old browsers.