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Скачать или смотреть How to Add a Comma Separator When Appending JSON Objects with Node.js fs.appendFile

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  • 2025-07-23
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How to Add a Comma Separator When Appending JSON Objects with Node.js fs.appendFile
How to add comma separator when appending JSON objects with node.js fs.appendFile?javascriptnode.jsjsonappend
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Описание к видео How to Add a Comma Separator When Appending JSON Objects with Node.js fs.appendFile

Learn how to properly append JSON objects to a file in Node.js by using an array, ensuring correct formatting with comma separators.
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This video is based on the question https://stackoverflow.com/q/67428710/ asked by the user 'Andrea D_' ( https://stackoverflow.com/u/10867346/ ) and on the answer https://stackoverflow.com/a/67428873/ provided by the user 'shubhendu madhukar' ( https://stackoverflow.com/u/6050439/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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How to Add a Comma Separator When Appending JSON Objects with Node.js fs.appendFile

When working with JSON data in Node.js, you might come across the necessity to store multiple JSON objects in a file. A common issue developers face is how to append these objects correctly, especially ensuring that they are formatted properly. Specifically, the challenge arises when attempting to add a comma separator between each JSON object when using the fs.appendFile() method. In this post, we will address this problem and provide a clear solution.

Understanding the Problem

In the given scenario, the task is to loop through a folder containing images and for each image, create an object that contains its path, a boolean indicating its posted status, and the date set to null. The goal is to save each of these objects into a JSON file.

Example Code

The original code was as follows:

[[See Video to Reveal this Text or Code Snippet]]

Resulting Output

The output produced by this code lacks comma separators due to appending directly, resulting in invalid JSON format:

[[See Video to Reveal this Text or Code Snippet]]

The output is two separate JSON objects without a comma between them, which makes it invalid JSON. Let's explore how to resolve this.

Solution: Use an Array to Store JSON Objects

The best approach to solve this problem is to create an array that holds each JSON object rather than appending them directly. By doing this, you ensure that when you stringify and write to the file, the format is always correct with appropriate comma separators.

Step 1: Create an Empty Array

Begin by initializing an empty array before looping through the images:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Push Each Object to the Array

Instead of appending each object directly, push it to the array as shown below:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Write the Array to the File

Finally, write this array to your images.json file with proper formatting. Use JSON.stringify to convert the array into a valid JSON format before writing:

[[See Video to Reveal this Text or Code Snippet]]

Final Output

After implementing the solution, the resulting JSON format in images.json will look like this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you can effectively append multiple JSON objects into a single valid JSON array in Node.js. This approach not only resolves the issue of missing commas but also ensures that your JSON structure is valid and easily accessible for future use. Remember, whenever you are handling multiple similar objects that need to be saved together, consider using an array to keep your JSON tidy and organized.

Happy coding!

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