JSON to Parquet

This repo is archived and the code moved to Arrow CLI Tools.

Convert JSON files to Apache Parquet. You may also be interested in csv2parquet, json2arrow, or csv2arrow.

Installation

Download prebuilt binaries

You can get the latest releases from https://github.com/domoritz/json2parquet/releases/.

With Cargo

cargo install json2parquet

Usage

Usage: json2parquet [OPTIONS] <JSON> <PARQUET>

Arguments:
  <JSON>     Input JSON file
  <PARQUET>  Output file

Options:
  -s, --schema-file <SCHEMA_FILE>
          File with Arrow schema in JSON format
      --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
  -c, --compression <COMPRESSION>
          Set the compression [possible values: uncompressed, snappy, gzip, lzo, brotli, lz4, zstd]
  -e, --encoding <ENCODING>
          Sets encoding for any column [possible values: plain, rle, bit-packed, delta-binary-packed, delta-length-byte-array, delta-byte-array, rle-dictionary]
      --data-pagesize-limit <DATA_PAGESIZE_LIMIT>
          Sets data page size limit
      --dictionary-pagesize-limit <DICTIONARY_PAGESIZE_LIMIT>
          Sets dictionary page size limit
      --write-batch-size <WRITE_BATCH_SIZE>
          Sets write batch size
      --max-row-group-size <MAX_ROW_GROUP_SIZE>
          Sets max size for a row group
      --created-by <CREATED_BY>
          Sets "created by" property
      --dictionary
          Sets flag to enable/disable dictionary encoding for any column
      --statistics <STATISTICS>
          Sets flag to enable/disable statistics for any column [possible values: none, chunk, page]
      --max-statistics-size <MAX_STATISTICS_SIZE>
          Sets max statistics size for any column. Applicable only if statistics are enabled
  -p, --print-schema
          Print the schema to stderr
  -n, --dry
          Only print the schema
  -h, --help
          Print help information
  -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 }