How to Format JSON Online

Raw JSON can be hard to read when it is minified or returned from an API.

A JSON formatter makes nested objects, arrays, keys, and values easier to inspect.

Formatting fails when JSON is invalid — look for trailing commas, single-quoted strings, or unescaped characters.

Fix syntax first, then use the pretty-printed output in docs, tests, or config files.

Copy an API response into the JSON Formatter, confirm it parses, then compare two versions with Text Diff if a field changed unexpectedly.

For JWT debugging, decode the token separately — formatting JSON inside a payload is different from verifying a signature.

DevToolKit’s JSON Formatter runs in your browser. Payloads are not sent to a server for basic format and validate steps.

Still avoid pasting production secrets on shared or untrusted devices.

Use Base64 Encoder/Decoder when a field is encoded, and JWT Decoder when inspecting auth tokens.

Browse the Developer Workbench for regex, hash, and diff utilities in the same session.