That assumes a perl data structure as the source, which wasn't clearly (to me) the case. Anyway, I do: 
JSON::to_json( ["\x{00e9}"], { 'ascii' => 1 } )

[download]
(with JSON using JSON::XS).
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In reply to Re^2: Handling special characters in JSON (TFM) by ysth
in thread Handling special characters in JSON by mcm1303

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