How to convert vector into JSON?

Question

I want to use Rust to write a static website but I have a very basic problem to serve data for it. The code is roughly as follows:

pub struct Post { title: String, created: String, link: String, description: String, content: String, author: String, } fn main() { let mut posts:Vec<Post> = Vec::new(); let post = Post { title: "the title".to_string(), created: "2021/06/24".to_string(), link: "/2021/06/24/post".to_string(), description: "description".to_string(), content: "content".to_string(), author: "jack".to_string(), }; posts.push(post); }

How can I convert posts into JSON like:

[{ "title": "the title", "created": "2021/06/24", "link": "/2021/06/24/post", "description": "description", "content": "content", "author": "jack", }]

Denys Séguret · Accepted Answer · 2021-06-24 09:40:35Z

The simplest and cleanest solution is to use serde's derive abilities to have the JSON structure derived from your Rust struct:

use serde::{Serialize}; #[derive(Serialize)] pub struct Post { title: String, created: String, link: String, description: String, content: String, author: String, }

Standard collections automatically implement Serialize when their content does.

You can thus build your json string with

let mut posts:Vec<Post> = Vec::new(); let post = Post { title: "the title".to_string(), created: "2021/06/24".to_string(), link: "/2021/06/24/post".to_string(), description: "description".to_string(), content: "content".to_string(), author: "jack".to_string(), }; posts.push(post); let json = serde_json::to_string(&posts)?;

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