用PowerShell修改一个JSON文件，不用写BOM [英] Modify a JSON file with PowerShell without writing BOM

问题描述

我需要使用 PowerShell 修改现有的 UTF8 编码 JSON 文件.我尝试使用以下代码:

I need to modify an existing UTF8 encoded JSON file with PowerShell. I tried with the following code:

$fileContent = ConvertFrom-Json "$(Get-Content $filePath -Encoding UTF8)"
$fileContent.someProperty = "someValue"
$fileContent | ConvertTo-Json -Depth 999 | Out-File $filePath

这会为文件添加一个 BOM，并以 UTF16 对其进行编码.是否可以让 ConvertFrom-Json 和 ConvertTo-Json 不进行编码/BOM?

This adds a BOM to the file and also encodes it in UTF16. Is it possible to have ConvertFrom-Json and ConvertTo-Json do not do the encoding / BOM?

推荐答案

这与 ConvertTo-Json 或 ConvertFrom-Json 无关.编码由输出 cmdlet 定义.Out-File 默认为 Unicode，Set-Content 为 ASCII.对于它们中的每一个，都可以明确定义所需的编码:

This has nothing to do with ConvertTo-Json or ConvertFrom-Json. The encoding is defined by the output cmdlet. Out-File defaults to Unicode, Set-Content to ASCII. With each of them the desired encoding can be defined explicitly:

... | Out-File $filePath -Encoding UTF8

或

... | Set-Content $filePath -Encoding UTF8

这仍会将 (UTF8) BOM 写入输出文件，但无论如何我都不会认为没有 BOM 的 UTF-8 编码是一个好习惯.

That will still write a (UTF8) BOM to the output file, but I wouldn't consider UTF-8 encoding without BOM a good practice anyway.

如果您想要 ASCII 编码的输出文件(无 BOM)，请将 UTF8 替换为 Ascii:

If you want ASCII-encoded output files (no BOM) replace UTF8 with Ascii:

... | Out-File $filePath -Encoding Ascii

或

... | Set-Content $filePath     # Ascii is default encoding for Set-Content

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