Strict RFC 8259 JSON Formatting, Validation & Diagnostics
JSON (JavaScript Object Notation) is the ubiquitous data interchange format for modern web APIs, configuration files, and cloud architectures. While many permissive parsers tolerate informal syntax extensions, strict RFC 8259 compliance guarantees maximum cross-platform interoperability across Python, Go, Rust, Java, and C# environments without silent data corruption.
Common Non-Compliant JSON Pitfalls
- Trailing Commas: Commas after the final array item (e.g.
[1, 2,]) or object property are strictly prohibited in standard JSON. - Comments: Unlike JavaScript, standard JSON does not permit single-line (
//) or multi-line (/* */) comments. - Unquoted or Single-Quoted Keys: Keys must always be enclosed in standard double quotes (
"key"); single quotes and bare identifiers are invalid. - Non-Finite Numbers: Special numeric values such as
NaN,Infinity, and-Infinitycannot be serialized into JSON. - Leading Zeros & Signs: Numbers like
012or+42violate RFC 8259 lexical specifications.
Precise 1-Based Line & Column Error Positioning
Rather than generic "Unexpected token" errors that leave developers searching through thousands of lines of minified payload, our validator pinpoints the exact 1-based row and column coordinates alongside a visual code pointer (^) without silently rewriting or auto-repairing your input.
Interactive Collapsible AST Tree Inspection
Easily navigate deeply nested JSON payloads with our interactive collapsible tree viewer. Expand and collapse containers on demand, search keys and values, inspect container size metrics (items/keys count), and differentiate data types with distinct visual syntax highlighting—all executed 100% locally in your browser memory without server transmissions.
Frequently Asked Questions
- RFC 8259 の厳格な標準規格に対応していますか？
- はい。コメント構文（// や /* */）、末尾カンマ、シングルクォート、引用符なしのキー、非有限値（NaN, Infinity）を厳格に拒否し、1始まりの行・列番号でエラー位置を正確に提示します。
- 入力した JSON データが外部サーバーに送信されることはありますか？
- 一切ありません。構文解析、整形、圧縮、ツリー構築はすべてブラウザローカルメモリ上で 100% 完結します。
- エスケープとエスケープ解除はどのような用途で使用しますか？
- 改行やタブ、ダブルクォートを含む平文テキストを JSON 文字列リテラル（\n, \t, \"）へ安全に可逆変換するために利用します。