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What is JSON?
JavaScript Object Notation is a lightweight, text-based data format for exchange defined by RFC 8259. It uses objects and arrays with strict syntax for interoperability.
Related tools
Try these DevStackIO tools for JSON:
JSON FormatterFree online JSON formatter and validator with syntax highlighting and error line numbers. Use as default for beautify+validate+minify in one place; for two-file comparison use json-diff, for schema generation use json-schema-generator. Input: JSON ≤10MB. Returns formatted JSON or line-numbered error. 100% private.Open tool →JSON ValidatorValidate JSON syntax and report errors with line numbers without reformatting. Use when only correctness matters; for auto-fix and formatting use json-formatter. Input: JSON text ≤10MB. Returns valid/invalid + error location. 100% client-side.Open tool →
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Definitions are written in plain language and sourced from MDN Web Docs, W3C specifications, and RFCs. Related tools run 100% in your browser — no data leaves your device.
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