wtf is json-validator?

JSON::Validator is a Perl tool that checks whether your data matches a set of rules you define upfront. Think of it as a bouncer for your data: you write a "schema" (a checklist of expectations, like "this field must be a string" or "this number can't be negative"), and the tool verifies incoming data against that checklist, flagging anything that doesn't comply. You define a schema as a simple structure listing required fields, allowed types, and constraints (like minimum values or allowed formats for dates and email addresses). Then you pass your actual data to the validator along with the schema. It walks through the data, checks each piece against the corresponding rule, and returns a list of errors if anything is wrong. Schemas can be written directly in your code or loaded from files and web URLs in JSON or YAML format. This would be useful for developers building Perl web applications that accept user input or API requests. For example, if you run a signup form and need to ensure every submission includes a valid email and an age above zero, this tool automates that gatekeeping so bad data never reaches your database. The project was spun off from a larger API framework called Swagger2, so it's particularly handy for validating API payloads against OpenAPI/Swagger specifications. The tool supports advanced JSON Schema features like referencing external definitions, validating nested objects, and checking specialized formats such as hostnames, IP addresses, and URIs. Some format checks (like domain and IP validation) use optional add-on modules if available, falling back to simpler regex matching otherwise. The README notes the project is experimental and its behavior may evolve.