Vue + Fetch - HTTP POST Request Examples
Below is a quick set of examples to show how to send HTTP POST requests from Vue to a backend API using fetch() which comes bundled with all modern browsers.
Other HTTP examples available:
- Vue + Fetch: GET, PUT, DELETE
- Vue + Axios: GET, POST
- React + Fetch: GET, POST, PUT, DELETE
- React + Axios: GET, POST, PUT, DELETE
- Angular: GET, POST, PUT, DELETE
- Blazor WebAssembly: GET, POST
- Axios: GET, POST, PUT, DELETE
- Fetch: GET, POST, PUT, DELETE
Simple POST request with a JSON body using fetch
This sends an HTTP POST request to the JSONPlaceholder api which is a fake online REST api that includes a /posts route that responds to POST requests with the contents of the post body and an id property. The id from the response is assigned to the vue component data property postId so it can be displayed in the component template.
created() {
// Simple POST request with a JSON body using fetch
const requestOptions = {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ title: "Vue POST Request Example" })
};
fetch("https://jsonplaceholder.typicode.com/posts", requestOptions)
.then(response => response.json())
.then(data => (this.postId = data.id));
}
Example Vue component at https://codesandbox.io/s/vue-fetch-http-post-request-examples-4i038?file=/app/PostRequest.vue
POST request using fetch with async/await
This sends the same POST request from Vue using fetch, but this version uses an async function and the await javascript expression to wait for the promises to return (instead of using the promise then() method as above).
async created() {
// POST request using fetch with async/await
const requestOptions = {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ title: "Vue POST Request Example" })
};
const response = await fetch("https://jsonplaceholder.typicode.com/posts", requestOptions);
const data = await response.json();
this.postId = data.id;
}
Example Vue component at https://codesandbox.io/s/vue-fetch-http-post-request-examples-4i038?file=/app/PostRequestAsyncAwait.vue
POST request using fetch with error handling
This sends a POST request from Vue to an invalid url on the api then assigns the error to the errorMessage component state property and logs the error to the console.
The fetch() function will automatically throw an error for network errors but not for HTTP errors such as 4xx or 5xx responses. For HTTP errors we can check the response.ok property to see if the request failed and reject the promise ourselves by calling return Promise.reject(error);. This approach means that both types of failed requests - network errors and http errors - can be handled by a single catch() block.
created() {
// POST request using fetch with error handling
const requestOptions = {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ title: 'Vue POST Request Example' })
};
fetch('https://jsonplaceholder.typicode.com/invalid-url', requestOptions)
.then(async response => {
const data = await response.json();
// check for error response
if (!response.ok) {
// get error message from body or default to response status
const error = (data && data.message) || response.status;
return Promise.reject(error);
}
this.postId = data.id;
})
.catch(error => {
this.errorMessage = error;
console.error('There was an error!', error);
});
}
Example Vue component at https://codesandbox.io/s/vue-fetch-http-post-request-examples-4i038?file=/app/PostRequestErrorHandling.vue
POST request using fetch with set HTTP headers
This sends the same POST request again from Vue using fetch with a couple of extra headers set, the HTTP Authorization header and a custom header My-Custom-Header.
created() {
// POST request using fetch with set headers
const requestOptions = {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Authorization': 'Bearer my-token',
'My-Custom-Header': 'foobar'
},
body: JSON.stringify({ title: 'Vue POST Request Example' })
};
fetch('https://jsonplaceholder.typicode.com/posts', requestOptions)
.then(response => response.json())
.then(data => this.postId = data.id);
}
Example Vue component at https://codesandbox.io/s/vue-fetch-http-post-request-examples-4i038?file=/app/PostRequestSetHeaders.vue
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