JSON Formatter, Validator & Minifier
Beautify messy JSON, catch syntax errors with exact positions, or minify and compress JSON to reduce file size. Everything runs locally in your browser — your data is never uploaded, so it’s safe for API keys, configs and production payloads.
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Privacy: this tool is fully client-side. Your JSON never leaves your browser — no uploads, no logging, no size limits beyond your device’s memory.
Format & beautify JSON
Turn single-line or messy JSON into a readable, indented structure with 2 spaces, 4 spaces or tabs. Perfect for reviewing API responses, config files and logs.
Validate with exact errors
Invalid JSON? The validator pinpoints the error with line and column numbers — trailing commas, missing quotes, unescaped characters — so you can fix it in seconds.
Minify & reduce file size
Strip whitespace to compress JSON for production payloads and configs. The size badge shows exactly how many bytes and what percentage you saved.
Working with APIs all day?
QalbIT designs and builds production-grade REST APIs, backends and integrations for web and mobile products — the systems behind the JSON.