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There are many ways to validate a json file against a avro schema to verify all is kosher. Sharing a practice I have been using for few years.

Objective - Validate avro schema well bound to the json file

First you must have a avro schema and json file. From there download the latest a avro-tools jar. At the moment 1.8.1 is the latest avro-tools version jar available.

Store the avro schema and json file in the same directory. Issue a wget to fetch the avro-tools jar


Here is what the directory looks like


Objective Details - Validate avro schema student.avsc binds to student.json

How - Issue the following

java -jar ./avro-tools-1.8.1.jar fromjson --schema-file YourSchemaFile.avsc YourJsonFile.json > AnyNameForYourBinaryAvro.avro

Using the student files example:

java -jar ./avro-tools-1.8.1.jar fromjson --schema-file student.avsc student.json > student.avro


Validation passed, a avro binary was created.


Now as a last step lets break something. Another avro schema (student2.avsc) is created which does not conform to student.json. Lets verify the avro-tools jar will fails to build a avro binary


As you can see from above output the avro binary failed to create due to validation errors

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Last update:
‎08-17-2019 01:37 PM
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