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JSON Formatter & Validator

Private, client-side JSON formatter + validator. Handles large files. Nothing uploaded.

About the JSON Formatter & Validator

Format, validate, beautify or minify JSON entirely in your browser. Nothing is uploaded to any server, production API responses with tokens, customer PII, or staging secrets stay on your machine. Validator pinpoints syntax errors with exact line and column numbers. Built to handle multi-megabyte JSON without freezing. Pairs with our JSON Formatters guide on when and why developers reach for these tools.

JSON Formatter & Validator
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How to use the JSON Formatter & Validator

  1. Paste your JSON into the input area (API response, config file, data export, etc.).
  2. Click Format to beautify with proper indentation.
  3. Or click Minify to compress to a single line for production payloads.
  4. If invalid, the error message shows the exact line and column number plus the problematic token.
  5. Copy the output to clipboard. Everything stayed in your browser, nothing was uploaded.

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