goldilocks-json-fmt

A simple, portable, fast, pretty JSON formatter.

The resulting JSON strikes a balance between 'too wide' (i.e. minified, all on one line) and 'too tall' (e.g. serde_json's pretty_print). You give the formatter a line limit (defaults to 100 chars), and it keeps things as wide as possible whilst preserving that limit. Sometimes the limit is impossible to achieve (e.g. you have a string that's longer than the line limit), in which case the formatter will break the limit by as little as possible.

The throughput of the Goldilocks formatter is about 300MB/s, which should be enough for most situations. It's about as fast as you can get without using crazy SIMD stuff, which would break the goal of being simple and portable.

Example:

```rust fn main() { // Ewww so horrible let json = r#"{"test/cases/87s-at-back.toml":{"comps":[{"length":32, "string":"sHsH","avgscore":-0.45625},{"length":64,"string":"sHWsMH", "avgscore":-0.44062495},{"length":96,"string":"WMsWMHsH","avgscore": -0.33124998},{"length":96,"string":"WsMHWsMH","avgscore":-0.33124998}, {"length":96,"string":"sHWMsWMH","avgscore":-0.33124995},{"length":64, "string":"WsMHsH","avgscore":-0.284375}]}}"#;

let perfect_json = goldilocks_json_fmt::format(&json).expect("Invalid JSON");

assert_eq!(
    &perfect_json,
    // So perfect!
    r#"{

"test/cases/87s-at-back.toml": { "comps": [ { "length": 32, "string": "sHsH", "avgscore": -0.45625 }, { "length": 64, "string": "sHWsMH", "avgscore": -0.44062495 }, { "length": 96, "string": "WMsWMHsH", "avgscore": -0.33124998 }, { "length": 96, "string": "WsMHWsMH", "avgscore": -0.33124998 }, { "length": 96, "string": "sHWMsWMH", "avgscore": -0.33124995 }, { "length": 64, "string": "WsMHsH", "avgscore": -0.284375 } ] } }"#, ); } ```

License: MIT