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JSONLint

The JSON validator.

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JSONLint is a browser-based JSON validator and reformatter. Users can paste, type, or load JSON from a URL, then validate it against JSON standards, format and beautify it, view it as a tree, and locate errors by line number. The site also offers a set of related utilities for converting, comparing, and inspecting JSON and other data formats. Validation is powered by @jsonlint/core, an open-source single-pass JSON engine, and syntax highlighting uses Shiki, the TextMate grammar engine used by VS Code.

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