JSON Formatter & Validator

This JSON formatter and validator runs entirely in your browser — the text you paste is never uploaded or logged anywhere. That matters more for JSON than for most data, because real-world payloads are full of API keys, bearer tokens, session IDs and customer records. Here they never leave your machine.

Paste any JSON and choose one of three actions. Beautify re-indents it with two spaces per level so nested objects and arrays become readable. Minify strips every insignificant space and newline back to a single compact line, which is what you want for production payloads and config you ship over the wire. Validate checks the text without changing it and reports either a green "valid" confirmation or the exact parser error message.

Validation uses the browser's native JSON.parse — the same strict RFC 8259 parser JavaScript itself uses — so if this tool accepts your JSON, your code will too. That strictness is the point: trailing commas, single quotes, unquoted keys and comments are all legal in JavaScript but illegal in JSON, and they are the errors this tool catches most often. One-click copy puts the result on your clipboard when you are done.