Raymond Raymond

Read JSON file as Spark DataFrame in Python / Spark

event 2019-11-18 visibility 19,365 comment 0 insights toc
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Spark has easy fluent APIs that can be used to read data from JSON file as DataFrame object. 

In this code example,  JSON file named 'example.json' has the following content:

[ { "Category": "Category A", "Count": 100, "Description": "This is category A" }, { "Category": "Category B", "Count": 120, "Description": "This is category B" }, { "Category": "Category C", "Count": 150, "Description": "This is category C" } ]



The file is loaded as a Spark DataFrame using SparkSession.read.json function.

multiLine=True argument is important as the JSON file content is across multiple lines. 

Code snippet

from pyspark.sql import SparkSession
from pyspark.sql.types import ArrayType, StructField, StructType, StringType, IntegerType

appName = "PySpark Example - JSON file to Spark Data Frame"
master = "local"

# Create Spark session
spark = SparkSession.builder \
    .appName(appName) \
    .master(master) \
    .getOrCreate()

# Create a schema for the dataframe
schema = StructType([
    StructField('Category', StringType(), True),
    StructField('Count', IntegerType(), True),
    StructField('Description', StringType(), True)
])

# Create data frame
json_file_path = 'data/example.json'
df = spark.read.json(json_file_path, schema, multiLine=True)
print(df.schema)
df.show()
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