JSON Formatter
Format, validate, and minify JSON locally in your browser.
JSON tools
JSON tools help you format, validate, minify, and convert structured data entirely in the browser. Whether you are debugging an API response, cleaning a config file, or swapping JSON with YAML, wowTools keeps the workflow local—paste, transform, copy or download—with clear parse errors when something is wrong.
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Frequently asked questions
- Which JSON tools should I start with?
- Use JSON Formatter for everyday pretty-printing, JSON Validator when you only need a syntax check with clear errors, JSON Minifier for compact payloads, and JSON ↔ YAML when configs move between formats.
- Why does my JSON fail validation?
- JSON requires double-quoted keys and strings, disallows trailing commas and comments, and accepts only one top-level value. The validator and formatter report the first parser error so you can fix quotes, commas, or unexpected tokens.
- Is my JSON uploaded when I use these tools?
- No. Parsing and conversion run in your browser. Optional on-device history stores recent inputs only if you enable it, and never sends payloads to wowTools servers for these tools.
- Can I convert JSON to YAML and back?
- Yes. The JSON ↔ YAML converter supports both directions with a swap action. Invalid input is rejected with a readable error before any conversion output is shown.
- Do formatting and minifying change my data values?
- Whitespace and serialization order may change as produced by JSON.stringify, but values and types stay the same for valid JSON. Always validate after manual edits if the payload is production-bound.