Format JSON and fix common syntax errors

1. Start with a small, valid example

Paste the example below and choose Format JSON. Indentation makes the object easier to inspect. Minify JSON removes unnecessary whitespace. Both operations parse and serialize your input; keep the original when byte-for-byte preservation matters.

{"customer_id":"0012","name":"Asha","active":true}

2. Fix the syntax before formatting

Keys and text values need double quotes. Remove trailing commas and comments. JSON uses true, false and null in lowercase. A JavaScript object literal is not necessarily JSON. The error message comes from your browser and may vary by browser version.

{"name":"Asha",}

Remove the comma after "Asha":
{"name":"Asha"}

3. Protect identifiers and check duplicate keys

Keep long IDs and leading zeros inside strings, such as "0012". JavaScript numbers cannot represent every integer beyond 9,007,199,254,740,991 exactly. Duplicate object keys can be overwritten during parsing; this formatter does not flag duplicates. Do not use it as a lossless duplicate-key inspector.

4. Copy, save and check the result

Use Copy result or Download JSON, then open the saved file in a text editor. Formatting validates JSON syntax, not your application schema or the correctness of field values. Check required fields and types in your consuming application.