I have the same key twice. Which one counts?

It depends on the server. PHP takes the last, Rails builds an array, Express takes the first by default. Do not rely on the behaviour being consistent.

Query String Parser

Turn a query string into a table, handling repeated keys.

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About this tool

Splits a query string into its parameters, as a table or as JSON. Repeated keys are preserved rather than silently collapsed, because servers disagree about which value wins.

Questions

I have the same key twice. Which one counts?: It depends on the server. PHP takes the last, Rails builds an array, Express takes the first by default. Do not rely on the behaviour being consistent.

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