# serde_json_borrow
Parse json into DOM on borrowed data.
The default [serde_json](https://github.com/serde-rs/json) parses into an owned `serde_json::Value`.
In cases where the DOM representation is just an intermediate struct, parsing into owned String
can cause a lot of overhead. `serde_json_borrow::Value<'ctx>` borrows the strings instead.
Instead of putting the values into a `BTreeMap` it pushes the values into a `Vec`. Access works via
an iterator, which has the same API when iterating the `BTreeMap`.
## OwnedValue
You can take advantage of `OwnedValue` to parse a `String` containing unparsed `JSON` into a `Value` without having to worry about lifetimes,
as `OwnedValue` will take ownership of the `String` and reference slices of it, rather than making copies.
# Limitations
Keys in objects are not allowed to have any JSON escaping characters. So if your keys contain any control characters (https://www.json.org/json-en.html), this crate will not work for you.
List of _unsupported_ characters in keys.
```
\" represents the quotation mark character (U+0022).
\\ represents the reverse solidus character (U+005C).
\/ represents the solidus character (U+002F).
\b represents the backspace character (U+0008).
\f represents the form feed character (U+000C).
\n represents the line feed character (U+000A).
\r represents the carriage return character (U+000D).
\t represents the character tabulation character (U+0009).
```
# Benchmark
```
Running benches/crit_bench.rs (/home/pascal/cargo_target_dir/release/deps/crit_bench-fd2d661e0b4255c5)
flat-json-to-doc/serde-json-owned
time: [352.60 µs 353.40 µs 354.26 µs]
thrpt: [236.01 MiB/s 236.59 MiB/s 237.12 MiB/s]
flat-json-to-doc/serde-json-borrowed
time: [175.53 µs 175.72 µs 175.93 µs]
thrpt: [475.23 MiB/s 475.81 MiB/s 476.34 MiB/s]
```
# TODO
Instead of parsing a JSON object into a `Vec`, a `BTreeMap` could be enabled via a feature flag.