JSON Formatter, Validator & Schema Checker
Beautify, minify, validate and explore JSON — with syntax highlighting, line numbers, tree view and JSON Schema validation.
About the JSON Formatter & Validator
Bytewrench's JSON formatter beautifies, minifies, validates and explores JSON entirely in your browser. Paste raw JSON, upload a .json file, or load a sample, and the tool instantly pretty-prints it with syntax highlighting, line numbers and a collapsible tree view. Invalid JSON is flagged with the exact line and column so you can fix it fast.
Because everything runs client-side, your data never touches a server — making it safe for API responses, config files and payloads that contain sensitive information.
How to use it
- Paste your JSON into the input editor, upload a file, or click Sample.
- The formatted, syntax-highlighted result appears instantly on the right.
- Switch to Tree View to explore nested structures, or use Minify to compact it.
- Optionally paste a JSON Schema and click Validate to check your data against it.
Pretty-print with 2/4-space or tab indentation, or minify to the smallest valid output.
Explore deeply nested objects and arrays interactively, collapse or expand any node.
Validate against any Draft-07 JSON Schema with exact error paths and messages.
All parsing happens locally in your browser — your JSON is never uploaded.
Frequently asked questions
Is this JSON formatter free?
Yes. Bytewrench's JSON formatter is completely free with no sign-up, ads or usage limits.
Is my JSON data sent to a server?
No. All formatting, validation and schema checking happen entirely in your browser. Nothing is uploaded.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks so JSON is easy to read. Minify removes all unnecessary whitespace to produce the smallest valid JSON, which is ideal for production payloads.
Can it validate JSON against a schema?
Yes. Paste a JSON Schema (Draft-07) and click Validate to see every violation with its exact path and message.