Local data workspace
JSON Formatter & Validator
Format, validate, minify, sort, search, and explore JSON in a collapsible tree. Import, copy, or download without uploading your data.
No upload · No account · Runs in this browser · Updated 2026-08-03
JSON workspace
Valid JSON · ready
Capabilities
Format, validate, inspect
Choose indentation, recursively sort object keys, minify, switch to a collapsible tree, search paths, and import or download JSON files.
Strict JSON
No silent repair
Comments, trailing commas, unquoted keys, and JSON5 syntax remain errors. The editor reports a line and column when the JavaScript parser exposes a position.
Local by design
Your payload stays here
Parsing, formatting, searching, copying, and file reads happen in this browser. Files larger than 2 MB are rejected to keep the page responsive.
FAQ
Does this JSON formatter upload my data?
No. Formatting runs locally in your browser in this static version, but you should still avoid pasting secrets into any online page.
Can it fix invalid JSON automatically?
It reports parse errors, but it does not guess missing commas, comments, or quotes because automatic repairs can change the data meaning.
What counts as valid JSON?
Valid JSON can be an object, array, string, number, boolean, or null, but it cannot include trailing commas or JavaScript-style comments.
When should I use minified output?
Use minified output when you need a compact value for a config field, fixture, or API example after you have already reviewed the formatted version.
What does the redaction check catch?
It flags likely private keys such as token, secret, password, email, phone, address, customer, user ID, API key, or auth paths so you can review them before sharing output.