json_str

Docs and samples

Use json_str for sanitised json literals:

let json = json_str!({
    query: {
        query_string: {
            query: "*"
    }
});

Use json_fn for sanitised json that supports variable substitutions:

let get_json = json_fn!(|qry| {
    query: {
        query_string: {
            query: $qry
    }
});

let json = get_json("\"some value\"");

Details

This crate is an ergonomic way to build json strings in Rust on the stable and nightly channels. Rust has a json-like syntax for defining structures, so it's easy to convert some valid Rust token trees into json. This crate will also minify whitespace and standardise quotes while it's building the String.

On stable, conversion is provided by a simple macro. On nightly, conversion is provided by a compiler plugin that sanitises the input at compile time instead of runtime. The nightly channel also provides an alternative plugin for creating &str literals instead of Strings, to avoid that allocation.