Noratrieb/jsonformat
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2021-07-17 23:30:05 +02:00

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Extremely fast JSON formatter

jsonformat is an extremely fast JSON formatter.

It formats over 60MB of nested JSON in under 0.4s.

Install

Currently, you have to build and install it yourself.
cargo build --release
The executable can then be found in target/release/jsonformat

Usage

USAGE:
    jsonformat [OPTIONS] [input]

ARGS:
    <input>    The input file to format

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
    -i, --indent <indentation>    Set the indentation used (\s for space, \t for tab)
    -o, --output <output>         The output file for the formatted json

How?

jsonformat does not actually parse the json, it just loops through each characters and keeps track of some flags. It then copies these characters to the output buffer, adding and removing whitespace.

The code is currently a bit chaotic, but it works and is fast, so good enough for now. Maybe it could profit from SIMD in the future, but I have never used it and I don't know whether it would work. Maybe some day...