JSON Formatter & Validator
Format, validate, explore, diff, and query JSON data. Everything runs in your browser.
Common use cases
This is usually most valuable when copied JSON is hard to read and you need a clean structure fast.
Inspect API responses
Beautify REST or GraphQL payloads before debugging a field mismatch or missing property.
Clean config files
Normalize app settings, seed data, and test fixtures before committing or sharing them.
Validate webhook payloads
Quickly check whether copied request bodies are valid JSON before wiring up downstream logic.
Frequently asked questions
Short answers to the questions people usually have before using the tool.
Does this JSON formatter send my data anywhere?+
No. Formatting and validation happen in your browser, which makes it useful for sensitive payload inspection during development.
What happens if the JSON is invalid?+
The tool shows the parser error with the exact position, so you can correct the malformed key, comma, quote, or bracket before trying again.
When should I use minify instead of format?+
Use format when debugging or reviewing nested data. Use minify when you need compact payloads for fixtures, snapshots, or transport size checks.
What is the Tree View tab for?+
Tree View renders your JSON as an interactive collapsible tree. Each node shows its type, and you can click to copy the JSON Path to any value — useful for deep API responses.
How does JSON Diff work?+
JSON Diff compares two JSON objects semantically (not as text). It detects added, removed, and changed keys at every depth, so reordering keys won't show false differences.
Can I convert YAML or CSV to JSON here?+
This tool focuses on formatting existing JSON. To convert from other formats, use the YAML to JSON converter or the CSV to JSON converter.
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