eolas/Programming_Languages/NodeJS/Miscellaneous/io_with_files.md

---
categories:
  - Programming Languages
tags:
  - backend
  - node-js
---

# I/O with files

## Read file from directory (JSON)

```js
const fs = require('fs');

// Get raw JSON
let inputJson = fs.readFileSync('source.json');

// Convert to JS
let data = JSON.parse(inputJson);
```

## Write file to directory (JSON)

```js
let newFile = 'new.json';

// Write JS object to JSON file as JSON
fs.writeFileSync(writePath, JSON.stringify(alienblood));
```

## Delete file from directory

```js
let filePath = 'file-to-delete.json';
fs.unlinkSync(filePath);
```

## Applications

### Overwrite file

```js
if (fs.existsSync(writePath)) {
  fs.unlinkSync(writePath);
  fs.writeFileSync(writePath, JSON.stringify(someJS));
} else {
  fs.writeFileSync(writePath, JSON.stringif(someJS));
}
```