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