JSON to Ruby hash converter
Useful for Rails seeds, RSpec fixtures and config when your data starts as JSON.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter json and key style.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Objects become hashes, arrays become arrays and null becomes nil. In symbol mode a key is written name: or "first-name": when it is not a plain name. Strings use double quotes with \, " and #{ escaped so no interpolation happens.
Example
Inputs: Key style = Strings "key" =>. Result: Ruby hash: { "name" => "Ali", "age" => 30, "active" => true, "tags" => [ "admin", "editor" ], "address" => { "city" => "Riyadh", "zip" => nil } }; Values converted: 7.
{
"name": "Ali",
"age": 30,
"active": true,
"tags": ["admin", "editor"],
"address": {
"city": "Riyadh",
"zip": null
}
}{
"name" => "Ali",
"age" => 30,
"active" => true,
"tags" => [
"admin",
"editor"
],
"address" => {
"city" => "Riyadh",
"zip" => nil
}
}Limits and caveats
- Symbol mode matches JSON.parse with symbolize_names: true; string mode matches plain JSON.parse.
- Strings holding an unpaired UTF-16 surrogate are not valid in Ruby and give an error.
Questions about this tool
When should I pick symbol keys?
When the code reads values as hash[:name], as most Rails code does. Pick strings if you read hash["name"].
Why does \#{ appear in some strings?
Inside a double-quoted Ruby string #{ starts interpolation, and the escape keeps it as plain text.
Does the output work in every Ruby version?
Quoted symbol keys like "text": need Ruby 2.2 or later; the rest works in older versions too.