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encoding/json: retrieving underlying reader offset in UnmarshalJSON()? #21589

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Julio-Guerra opened this issue Aug 24, 2017 · 1 comment

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@Julio-Guerra
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commented Aug 24, 2017

I am using big json configuration files and trying to produce useful user error messages, at least including the current line in the file.

So my question is: is there any way to retrieve the underlying reader's offset from UnmarshalJSON() to be able to return parsing or validation errors including it?

go version go1.8.3 linux/amd64

@Julio-Guerra Julio-Guerra changed the title encoding/json: retrieving current file offset in UnmarshalJSON()? encoding/json: retrieving underlying reader offset in UnmarshalJSON()? Aug 24, 2017

@ianlancetaylor

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commented Aug 25, 2017

We don't use the issue tracker to ask questions. Please see https://golang.org/wiki/Questions . Thanks.

You can check whether the returned error value is a json.UnmarshalTypeError, which has an Offset field. See https://golang.org/pkg/encoding/json/#UnsupportedTypeError .

Closing because there is no bug here.

@golang golang locked and limited conversation to collaborators Aug 25, 2018

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