How to convert JSON String to HashMap in Rust?

Question

I am receiving a string like below (Not in JSON or HashMap neither) as kind of key value pair from implicit JSONWebkey crate:

{ "kid":"kid-value",
"kty":"RSA",
"use":"sig",
"n":"n-value",
"e":"e-value" }

Now how can I convert to proper HashMap to extract key and value of "e" and "n"? Or is there a simpler way to extract exact value of "e" and "n"?

Do you have the input as a json string? If so you can use serde_json, there is an example on their github if that is what you want. As for the jsonwebkey crate I am not familliar with it — IamFr0ssT
– IamFr0ssT, Commented Oct 19, 2020 at 7:27
"Not in JSON [...] JSONWebkey" that sounds a lot like JSON, why are you saying it's not? serde should be able to deserialise this to a hashmap just fine, or to a struct of the relevant fields. — Masklinn
– Masklinn, Commented Oct 19, 2020 at 7:29
No, JSON Web key generated from crate 'JsonWebKey_Convert' using '.to_jwk()' is returning string only, Please verify — Armani_bologne
– Armani_bologne, Commented Oct 20, 2020 at 6:12

rustyMagnet · Accepted Answer · 2021-07-02 10:42:49Z

2

The string is JSON, so you should just parse it. By default serde_json ignores all unknown fields, so declaring a struct with only the needed fields is enough:

#[derive(serde::Deserialize)]
struct Values {
    n: String,
    e: String,
}

fn main() -> Result<()> {
    let s = r#"{ "kid":"kid-value",
"kty":"RSA",
"use":"sig",
"n":"n-value",
"e":"e-value" }"#;

    let value = serde_json::from_str::<Values>(s)?;

    println!("{}", value.e);
    println!("{}", value.n);

    Ok(())
}

edited Jul 2, 2021 at 10:42

rustyMagnet

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answered Oct 19, 2020 at 7:26

mcarton

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