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

Reads from stdin if no file is supplied. Outputs to stdout if no output file is specified.

On windows, it writes to a file called <filename>_f.json, unless the --stdout flag is used or a custom output file is provided. This it to enable drag-and-drop in windows explorer.

Error handling

jsonformat does not report malformed json - it can't even fully know whether the json is actually malformed. Malformed json is just formatted kind of incorrectly, with no data lost and no crashes. If you find one, open an issue,

How?

jsonformat does not actually parse the json, it just loops through each character 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...