PasteKit Formatter icon
PasteKit Formatter icon

PasteKit Formatter

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Private online formatter, validator and converter for JSON, YAML, SQL, XML, CSV and 50+ formats. Everything runs in your browser; nothing you paste is uploaded.

JSON formatter and validator (dark theme): paste on the left, formatted output on the right.

Cost / License

  • Free
  • Proprietary

Platforms

  • Online
JSON Diff: structural comparison with added, changed and removed values, JSON Patch and merge patch output.
YAML formatter and validator with plain-English warnings (e.g. YAML 1.1 "NO" is read as false).
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PasteKit Formatter information

PasteKit Formatter was added to AlternativeTo by Koh-Yee-Huei on and this page was last updated .

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What is PasteKit Formatter?

PasteKit is a free developer toolbox for structured data and code. Paste on the left and PasteKit detects the format and pretty-prints it on the right in milliseconds, with errors pinned to the exact line and column and explained in plain English.

  • 58 formats: JSON, JSON5, NDJSON, YAML, TOML, XML, CSV, SQL (with dialects), HTML, CSS, JavaScript, TypeScript, Python, Go, Rust, Java, C/C++, GraphQL, Markdown, Dockerfile, nginx and more, using the same formatters you run locally (Prettier, Ruff, gofmt, rustfmt, clang-format) compiled to WebAssembly.
  • 48 converters: JSON to and from YAML, CSV, XML, TOML and Excel, JSON to TypeScript types, and more.
  • 16 JSON tools: diff, JSON Patch, schema validator, repair, path finder (JSONPath/jq), tree and table viewers, sort, escape/unescape, size analyzer, token counter.
  • JWT decoder and encoder, plus validators and minifiers for every format.
  • Private by design: processing happens in a Web Worker, and a published Content Security Policy blocks the page from sending your input anywhere. Share links keep content after the "#", which browsers never send to servers.
  • Works offline after the first visit, no sign-up, dark mode, available in 9 languages.

Free to use and supported by ads.