Validates JSON syntax and optionally checks it against a JSON Schema.
JSON Validator checks whether your JSON is syntactically valid and, when you provide a JSON Schema, verifies that the data conforms to it. It uses the Ajv library under the hood to report every schema violation at once, with the path to each offending field. It's handy for catching malformed JSON, confirming API payloads match a contract, or linting config files before you ship them.
No. Validation runs entirely in your browser using JavaScript, so neither your JSON nor your schema is ever uploaded or stored on a server.
If you leave the schema field empty, the tool only checks that your input is syntactically valid JSON and reports it as valid without any schema comparison.
Schema validation is powered by Ajv with strict mode disabled, so standard JSON Schema keywords like type, required, properties, and enum work as expected.
It reports all errors at once. Each line shows the instance path of the failing field (or root) along with the validation message, so you can fix everything in one pass.
The parser follows standard JSON rules, so common issues like trailing commas, single quotes, comments, or unquoted property names will cause a syntax error even if they look acceptable in JavaScript.