mirror of
https://github.com/oven-sh/bun
synced 2026-02-02 15:08:46 +00:00
55 lines
1.2 KiB
Plaintext
55 lines
1.2 KiB
Plaintext
---
|
|
title: Append content to a file
|
|
sidebarTitle: Append to file
|
|
mode: center
|
|
---
|
|
|
|
Bun implements the `node:fs` module, which includes the `fs.appendFile` and `fs.appendFileSync` functions for appending content to files.
|
|
|
|
---
|
|
|
|
You can use `fs.appendFile` to asynchronously append data to a file, creating the file if it does not yet exist. The content can be a string or a `Buffer`.
|
|
|
|
```ts
|
|
import { appendFile } from "node:fs/promises";
|
|
|
|
await appendFile("message.txt", "data to append");
|
|
```
|
|
|
|
---
|
|
|
|
To use the non-`Promise` API:
|
|
|
|
```ts
|
|
import { appendFile } from "node:fs";
|
|
|
|
appendFile("message.txt", "data to append", err => {
|
|
if (err) throw err;
|
|
console.log('The "data to append" was appended to file!');
|
|
});
|
|
```
|
|
|
|
---
|
|
|
|
To specify the encoding of the content:
|
|
|
|
```js
|
|
import { appendFile } from "node:fs";
|
|
|
|
appendFile("message.txt", "data to append", "utf8", callback);
|
|
```
|
|
|
|
---
|
|
|
|
To append the data synchronously, use `fs.appendFileSync`:
|
|
|
|
```ts
|
|
import { appendFileSync } from "node:fs";
|
|
|
|
appendFileSync("message.txt", "data to append", "utf8");
|
|
```
|
|
|
|
---
|
|
|
|
See the [Node.js documentation](https://nodejs.org/api/fs.html#fspromisesappendfilepath-data-options) for more information.
|