How to Parse Local JSON Files from File Manager in Flutter

Discover how to parse local JSON files from the file manager in Flutter, using FilePicker and efficient JSON decoding techniques.
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How to Parse Local JSON Files from File Manager in Flutter

In Flutter development, working with JSON is a common task. While many examples demonstrate how to parse JSON files from the application assets, you may find yourself needing to access JSON files directly from the file manager. This guide will guide you through the process of selecting a local JSON file using Flutter's FilePicker, reading its contents, and parsing it for use in your app.

Understanding the Problem

The Challenge:

Common Errors:

You might encounter errors like:

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

These errors occur when you try to load a file path that isn't recognized as an asset.

The Solution

To successfully read and parse a local JSON file from the file manager, you will need to follow these steps:

Step 1: Use FilePicker to Select a File

First, you need to implement the Flutter FilePicker to allow the user to select a JSON file.

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

Step 2: Read the File Contents

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

Step 3: Define the JsonItem Model

To decode the JSON data, you must define a model that maps to the JSON structure. Here’s a simple model example:

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

Conclusion

With this knowledge, you can enhance your Flutter applications by dynamically loading data from the user's filesystem, fostering a more interactive and customizable experience.