decoding of object with 'duplicate' key

[rxi]

decoding of object with 'duplicate' key

[odanoburu]

Thanks for the clarifications; no idea what I was thinking at the time.

[xphip]

[error] 30#30: *4 lua entry thread aborted: runtime error: json.lua:185: expected string for key

The string ({1: 1, '1':2}) you are trying to parse isn't a valid JSON.
Index cannot be numeric type. Cannot have duplicate index. Double quotes to define an index.

Trying to encode values which are unrepresentable in JSON will never result in type conversion or other magic: sparse arrays, tables with mixed key types or invalid numbers (NaN, -inf, inf) will raise an error
https://github.com/rxi/json.lua#notes

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In Javascript, Object.entries isn't a JSON parser.

The Object.entries() method returns an array of a given object's own enumerable string-keyed property [key, value] pairs.

The proper method to parse a JSON in Javascript is JSON.parse
And trying to parse your string is returned:

Uncaught SyntaxError: Unexpected number in JSON at position 1

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Making these small corrections (even still with duplicate index) the code works fine.

local decoded = json.decode('{"1":1,"1":2}')
local encoded = json.encode(decoded)
ngx.say(encoded)

-- Output: {"1":2}