JSON Formatter / Minifier / Validator

Pretty mode parses the JSON and re-emits it with consistent indentation. Minify drops all whitespace for the smallest possible payload (about 15–25% smaller for typical config files). Errors include a position pointer — paste the message into your editor and jump straight to the problem.

Anything sent to a server?

No. JSON.parse + JSON.stringify run in your browser.

Why does my JSON say "Unexpected token"?

JSON requires double-quoted keys, no trailing commas, no comments. Strict format. JSON5 / JSONC are different specs.

Difference between formatting and validating?

A successful round-trip implies validity. If parse fails, error message points at the offending position.

Can it handle huge JSON?

In-browser limit is roughly RAM. Multi-megabyte fine; multi-gigabyte better processed by a streaming parser.

• JSON ↔ YAML

  Convert between JSON and YAML losslessly, preserving scalar types and structure.

• JSON ↔ CSV

  Convert between flat JSON arrays and CSV / TSV — RFC 4180 quoting via PapaParse.

• JSONPath Playground

  Test JSONPath queries against a sample document — recursive descent, filters, wildcards.