rename a json file in go

To rename a JSON file in Go, you can use the os and ioutil packages to handle file operations. The steps to perform this task are:

Use the os.Rename() function to rename the existing JSON file to the desired new name.
If needed, read the content of the renamed file using ioutil.ReadFile().
Parse the JSON content using json.Unmarshal() to get the Go native representation (e.g. a map[string]interface{}).
Make the required changes to the Go struct.
Encode the new Go struct into JSON content using json.Marshal().
Write the new JSON content into the same file path using ioutil.WriteFile().

Here's an example code snippet that demonstrates how to rename a JSON file:


main.go
package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "os"
)

func main() {
    oldName := "old.json"
    newName := "new.json"

    // Step 1: Rename the file
    err := os.Rename(oldName, newName)
    if err != nil {
        panic(err)
    }

    // Step 2: Read the content of the renamed file
    content, err := ioutil.ReadFile(newName)
    if err != nil {
        panic(err)
    }

    var data map[string]interface{}

    // Step 3: Parse the JSON content
    err = json.Unmarshal(content, &data)
    if err != nil {
        panic(err)
    }

    // Step 4: Make the required changes
    data["name"] = "John Doe"

    // Step 5: Encode the new Go struct to JSON
    newContent, err := json.Marshal(data)
    if err != nil {
        panic(err)
    }

    // Step 6: Write the new JSON content to the file
    err = ioutil.WriteFile(newName, newContent, 0644)
    if err != nil {
        panic(err)
    }

    fmt.Println("JSON file renamed and updated successfully!")
}
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