Project metadata
A compact object with nested values and arrays.
{"name":"Tools Website","private":true,"features":["format","validate","minify"],"nested":{"runs":"locally","apis":0}}FormattingLocal-only
JSON Formatter and Validator
Format, minify, and validate JSON in your browser. Input stays local and never uploads to a server.
This tool runs locally in your browser. Your input is not uploaded.
No uploadsNo server logsNo runtime APIsBrowser-only transforms
JSON output
Run the tool to generate local output.
Options
Examples
API response
A small response body that is easier to inspect after formatting.
{"status":"ok","items":[{"id":1,"active":true},{"id":2,"active":false}]}How it works
- The browser parses the input with native JSON.parse.
- Valid values are serialized with JSON.stringify for formatted or minified output.
- Parse errors are shown directly in the tool area without sending input anywhere.
Limitations
- Comments and trailing commas are not valid JSON and are rejected.
- Very large documents may be limited by browser memory.
FAQ
Does this JSON formatter upload my data?
No. The parsing and formatting logic runs in your browser and does not call a backend API.
Can it format JSON with comments?
No. The tool intentionally follows strict JSON syntax so output is predictable.