JSON to Arrow

Convert JSON files to Apache Arrow. You may also be interested in csv2arrow, json2parquet, or csv2parquet.

Installation

Download prebuilt binaries

You can get the latest releases from https://github.com/domoritz/json2arrow/releases/.

With Cargo

cargo install json2arrow

Usage

USAGE:
    json2arrow [OPTIONS] <JSON> [ARROW]

ARGS:
    <JSON>     Input JSON file
    <ARROW>    Output file, stdout if not present

OPTIONS:
    -h, --help
            Print help information

    -m, --max-read-records <MAX_READ_RECORDS>
            The number of records to infer the schema from. All rows if not present. Setting
            max-read-records to zero will stop schema inference and all columns will be string typed

    -n, --dry
            Only print the schema

    -p, --print-schema
            Print the schema to stderr

    -s, --schema-file <SCHEMA_FILE>
            File with Arrow schema in JSON format

    -V, --version
            Print version information

The --schema-file option uses the same file format as --dry and --print-schema.

Limitations

Since we use the Arrow JSON loader, we are limited to what it supports. Right now, it supports JSON line-delimited files.

{ "a": 42, "b": true }
{ "a": 12, "b": false }
{ "a": 7, "b": true }