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JSON Tools

Format, validate, minify, and convert JSON — all in your browser.

JSON is the lingua franca of modern APIs. This suite of JSON utilities helps you format messy payloads, catch structural errors on the exact line and column, shrink files for production, and translate between JSON and CSV — without uploading a single byte.

JSON Formatter

Pretty-print and validate JSON with adjustable indentation. Runs entirely in your browser — nothing is uploaded.

JSON Validator

Validate JSON syntax and get precise line/column error locations. 100% in-browser.

JSON Minifier

Strip whitespace from JSON and see the exact byte savings. Runs in your browser.

JSON Viewer

Browse JSON as a collapsible tree with syntax highlighting. Local-only.

JSON to CSV

Convert arrays of JSON objects to CSV with optional dot-notation flattening.

CSV to JSON

Convert CSV to a JSON array of objects. Header detection and type inference built-in.