Serde json key must be a string

help
1

I want to create a struct from a JSON string that looks like this:

{modules: []} // the JSON string

struct UserData {
     modules: Vec<Modules>
}

And I use the following code to parse it into the given struct:

let user_data: UserData = serde_json::from_str(&json_str).unwrap();

But this gives me an error: Error("key must be a string", line: 1, column: 2)
Does this happen because the string does not look like this? {"modules": []} How can I fix this?

2

This is not JSON. In JSON every object key is always a string.

If you want to support this, you will need to find some format that supports this and a serde deserializer for it (or write one yourself).

1 Like
3

So I have to use serde_json::to_string() first?

4

No. That still won't work.

5

Can you give me an example for a serde serializer?

6

Sorry, I mean deserializer (something to replace your from_str()).

7

Can you give me an example for this?

8

Your data is not valid JSON, but it is valid JSON5 so you should be able to use the json5 crate for this.

4 Likes
10

This topic was automatically closed 90 days after the last reply. We invite you to open a new topic if you have further questions or comments.