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require('steno')\n\nsteno.writeFile('file.json', data, err => {\n if (err) throw err\n})\n```\n\n## The problem it solves\n\n### Without steno\n\nLet's say you have a server and want to save data to disk:\n\n```javascript\nvar data = { counter: 0 }\n\nserver.post('/', (req, res) => {\n // Increment counter\n ++data.counter\n\n // Save data asynchronously\n fs.writeFile('data.json', JSON.stringify(data), err => {\n if (err) throw err\n res.end()\n })\n})\n```\n\nNow if you have many requests, for example `1000`, there's a risk that you end up with:\n\n```javascript\n// In your server\ndata.counter === 1000\n\n// In data.json\ndata.counter === 865 // ... or any other value\n```\n\nWhy? Because, `fs.write` doesn't guarantee that the call order will be kept. Also, if the server is killed while `data.json` is being written, the file can get corrupted.\n\n### With steno\n\n```javascript\nserver.post('/increment', (req, res) => {\n ++data.counter\n\n steno.writeFile('data.json', JSON.stringify(data), err => {\n if (err) throw err\n res.end()\n })\n})\n```\n\nWith steno you'll always have the same data in your server and file. 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