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My Express app is receiving a base64-encoded MP4 from the browser and writing it to a file. But the file isn't a valid video file, and the "file" utility simply identifies it as "data".

My Code:

const path = `${config.uploadPath}`;
const filename = `${uniqid()}.mp4`;

let base64Data = req.body.base64.replace(/^data:([A-Za-z-+/]+);base64,/, '');


fs.writeFileSync(`${path}${filename}`, base64Data, 'base64');

My Express app is receiving a base64-encoded MP4 from the browser and writing it to a file. But the file isn't a valid video file, and the "file" utility simply identifies it as "data".

My Code:

const path = `${config.uploadPath}`;
const filename = `${uniqid()}.mp4`;

let base64Data = req.body.base64.replace(/^data:([A-Za-z-+/]+);base64,/, '');


fs.writeFileSync(`${path}${filename}`, base64Data, 'base64');

• javascript
• node.js
• video
• base64

Share Improve this question Follow asked Aug 21, 2018 at 18:26 Rubens FernandesRubens Fernandes 2511 silver badge77 bronze badges

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1 Answer 1

Sorted by: Reset to default 11

Are you sure there is a variable named base64 is request response? If so, please try this code:

req.body.base64 = req.body.base64.replace(/^data:(.*?);base64,/, ""); // <--- make it any type
req.body.base64 = req.body.base64.replace(/ /g, '+'); // <--- this is important

fs.writeFile(`${path}${filename}`, req.body.base64, 'base64', function(err) {
    console.log(err);
});

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