Free JSON validator command-line tool for Windows®

Easy to use JSON validator to check one or multiple JSON data files.

Usage example:

valbuddy.exe -v -verbose -s "D:\Examples\Library\library_schema.json" "D:\Examples\Library\library.json" "D:\Examples\Library\library_invalid.json"

Call "valbuddy.exe" without any paramters to get a list of options in the console window.

Validation output:

D:\Examples\Library\library.json: valid

D:\Examples\Library\library_invalid.json: invalid
Did not find the following required properties: [title]
Input location: /bib/book/2
Schema location: /properties/bib/properties/book/items

Finished processing

Also available as: JSONBuddy Web API for data validation

If you prefer a web-based solution, you can use the JSONBuddy Web API for validating JSON data. This API is designed for developers who need to validate JSON documents programmatically without installing any software. It offers two endpoints:

• Simple validation for quick checks with plain JSON strings.
• Advanced validation supporting structured input.

Command-line Options Reference

The command-line tool (valbuddy.exe) provides a versatile solution for automated validation and processing of XML and JSON data on Windows®. It supports JSON Schema validation, W3C XML checks, pretty-printing, minification, and batch operations — all accessible from the command prompt or scripts.

Usage: ValBuddy.exe [-v | -wf [-verbose] [-s] <file1> ... <fileN>] | [<settings-xml>]

-v             Validate one or more XML or JSON files.
-wf            Perform a well-formedness check.
-verbose       Show a list of all errors and warnings.
-s             Validate against a specific W3C or JSON Schema.
<settings-xml> Run batch validation based on a settings XML file (Pro license only).
            

-jsl           Apply JSON Schema Linter for best practice checks. (Pro)
-jspp          Pretty-print JSON input of any size. Overwrites input if no output is given. (Pro)
-jsm           Minify JSON input. Overwrites input if no output is given.
-jst           Run a JSON Schema test configured in JSONBuddy. (Pro)
-jsv           Use streaming JSON validator for large files. Requires Large Data license.
-j2csv         Convert JSON to CSV. Requires a configuration created in JSONBuddy. (Pro)
            

-patch         Apply JSON Patch operations to one or more documents. (Pro)
-settings-xml  Use XML settings file to automate validation tasks and logging. (Pro)
            

ValBuddy.exe -v -s "D:\Schemas\library_schema.json" "D:\Data\library.json"

ValBuddy.exe -jspp -oj "D:\Output\pretty.json" "D:\Data\raw.json"

ValBuddy.exe -j2csv -config "D:\Configs\export_config.json" -o "D:\Output\data.csv" "D:\Data\source.json"