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Editorial Team
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Asked: 2026-05-20T05:55:10+00:00

I’m very new to JS and I’m doing a small html page that -for

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I’m very new to JS and I’m doing a small html page that -for now- will be ran locally. I have a string in JSON format which I need to be able to store/load as a file on the hard drive.

To be able to store the string, I’ve got this to work on Firefox:

function saveJSON() {
    var obj = {name:'John', max:100};
    window.open( "data:text/json;charset=utf-8," + escape(JSON.stringify(obj)))
}

However, it only works on FF, and I need to be able to do it with Internet Explorer also. I’ve read some stuff about using ActiveX, but I haven’t found any example on how to do it.

Should I try and use ActiveX, or is there a better HTML/JS way to save the file which works for both browsers?

The second problem is loading the JSON file. I’ve found that once loaded, I can turn it into a JSON var with JSON.parse. But I have no idea how to load a selected JSON file. I have an 

<input type=file id="filePath">

to get the file path (though it returns different things in both browsers), and I would like to be able to do something like 

var a = loadFile(filePath.value)

Any suggestions on how to do it? I’m really stuck here and would greatly appreciate any help.

Thanks.

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1 Answer

  1. Editorial Team

    Well, I found a solution to reading a client-side file which works pretty good. It’s also not completely insecure since “direct and intentional user intervention is required to expose individual files to the script“. Currently it works for me on Firefox only, so I guess I’ll have to settle with this constraint for now.

    Thank you all for your comments and answers; they’ve been very helpful and I’ve learned a lot.

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