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Skip to contentBeautify, minify and validate JSON in your browser. Syntax errors with line hints — copy or download instantly.
Full tool — runs in your browser. No sign-up required.
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Paste messy API responses, config snippets or log lines and turn them into readable JSON in one click. Tentaco's JSON formatter validates syntax, highlights errors with line and column hints, and lets you switch between pretty-print and minified output without sending your data to a server.
Online formatters on aggregator sites often run server-side or log inputs for analytics. That is risky when you paste production configs, JWT payloads, customer records or internal API keys — even briefly. Tentaco processes JSON locally in the browser tab: nothing is uploaded for standard format and validate operations.
Use it during development to debug malformed payloads before they hit your app, to prepare fixtures for tests, or to compare minified vs indented output. Tab or space indentation, key sorting and error recovery help you fix broken JSON fast. Works offline after the first load — ideal on locked-down corporate laptops without npm or jq installed.
Free, no account, instant. Pair with other JSON tools in the JSON hub: CSV conversion, YAML bridge, JWT inspector and GraphQL formatter in the same privacy-friendly workspace.
Click «Open tool» to open the JSON Formatter in JSON Workbench.
Paste or type JSON into the editor — invalid syntax is highlighted immediately.
Choose pretty-print or minify, set indentation and optional key sorting.
Copy the formatted result or download it as a .json file.
Tentaco runs this tool in your browser whenever possible. Input you provide is handled in the page session unless the tool explicitly calls a remote API. Close the tab after use on shared computers.
LocalThis tool processes data locally in your browser. Tentaco does not receive your file contents for this mode.
No. Formatting and validation run locally in your browser for standard use.
Yes. Invalid JSON shows line/column errors; valid JSON can be pretty-printed or minified instantly.
Browser memory limits apply for very large documents (typically tens of MB). For huge logs, split input or use CLI tools.
Local processing avoids uploading personal data to third-party formatter sites — still avoid pasting secrets on shared computers.
No sign-up. Open the tool and start formatting immediately.
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