How to Read a JSON File as a JSON Object in Go?

Reading JSON Files as JSON Objects in Go

In Go, reading a JSON file as a JSON object requires specific handling due to the use of pointers in the Unmarshal function.

Failed Attempts:

Your initial attempt failed because the data variable did not point to a valid memory address for the JSON values to be stored.

Your second attempt stored the JSON values as a string, which prevents direct access to specific object properties.

Correct Approach:

To read a JSON file as a JSON object, use the following steps:

1. Read the file into a byte slice using ioutil.ReadFile:

   plan, _ := ioutil.ReadFile(filename)

2. Create a pointer to an empty interface (this is where the JSON values will be stored):

   var data interface{}

3. Use json.Unmarshal to decode the JSON data into the interface pointer:

   err := json.Unmarshal(plan, &data)

Note:

• It's important to check the error returned by ReadFile and Unmarshal.
• To access specific object properties, you'll need to use type assertion on the data interface.
• Consider using a concrete struct to unmarshal the JSON data for more structured access to object properties.

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