JavaScript Object Notation, a lightweight text-based data interchange format using key-value pairs and arrays that is both human-readable and machine-parseable.
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JSON (JavaScript Object Notation) is a language-independent data format derived from JavaScript that represents data as key-value pairs and ordered arrays. It is the dominant format for data interchange on the web and in API communication. In AI agent systems, JSON serves dual roles: tool call parameters (the model produces structured JSON to specify which tool to call and with what arguments) and tool results (returned as JSON objects). Its verbosity is a tradeoff — each key-value pair costs tokens against the context window budget.
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