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Open CSV in an editable grid, search and export, runs locally in your browser.
Compare two CSV files side by side.
Write and format GraphQL queries; load schema JSON and inspect types locally.
Decode JWT header and payload locally for API debugging.
Paste or load OpenAPI YAML/JSON, edit the spec, and browse paths and operations.
Browse Parquet in an editable grid and export back to .parquet locally.
Paste, edit, prettify JSON payloads, and search with JSONPath locally.
Test JavaScript regular expressions with flags, multiline text, and capture groups locally.
Excel ワークブックを開きます (選択したシートから最大 200 MB、最大 50,000 行がロードされます)。
