JSON Formatter & Validator
Pretty-print, minify, and validate JSON safely.
Informational only; verify critical results independently.
How to use
- Paste JSON from an API response, config file, or log snippet.
- Click Format to indent consistently, or Minify for a single-line payload.
- Read validation errors with line hints when the parser rejects input.
- Fix trailing commas, missing quotes, or stray comments (JSON does not allow comments).
- Copy the cleaned JSON back to your editor or HTTP client.
- For secrets, redact tokens before pasting into unknown tools—here processing is local.
Examples
- Pretty-print a minified package.json snippet
- Validate GeoJSON before committing to git
- Minify JSON for an inline <script> config
- Find the exact comma error in a 400 Bad Request body
- Compare two API responses after formatting both
- Convert tab-indented JSON to 2-space for team style guide
FAQ
- JSON with comments?
- Strict JSON rejects // and /* */. Strip comments or use JSON5 in a compatible toolchain.
- Large files?
- Browser memory limits apply; very big payloads may lag or fail—use CLI jq for huge files.
- Why does order of keys change?
- Some formatters sort keys; others preserve order—depends on implementation.
- Unicode and emoji in strings?
- Valid JSON escapes them; the viewer should display UTF-8 text correctly.
- Trailing commas?
- Invalid in JSON—remove them for strict parsers.
- Privacy?
- Parsing runs in your browser; nothing is uploaded to Vastorae.
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Last updated: 2025-09-15