What is a JSON formatter?

A JSON formatter, also called a JSON beautifier or pretty-printer, turns compact or messy JSON into clean, indented output that is easier to read, debug, review, and share.

How do I validate JSON?

Paste your JSON into the input box and click Format or Validate. If the JSON is invalid, the tool shows the parser error, the likely line and column, and a plain-English hint for common mistakes like trailing commas or single quotes.

What is the difference between formatting and minifying JSON?

Formatting adds indentation and line breaks to make JSON readable. Minifying removes unnecessary whitespace so the JSON is as compact as possible for transport, storage, or embedding in requests.

Is my JSON data sent to a server?

No. This JSON formatter runs entirely in your browser. Your payload never leaves your device, which makes it safer for inspecting API responses, logs, config files, and tokens that should stay local.

JSON Formatter & Validator

Format, beautify, validate, and minify JSON online. Inspect errors with line hints, copy clean output, and keep sensitive payloads local in your browser.

Shortcuts: Ctrl/Cmd + Enter formats, Shift + Enter minifies. Use Repair JSON for common copy-paste issues like comments, trailing commas, single quotes, or bare keys. Saved drafts stay in this browser only.

JSON input

Paste an API response, config file, webhook payload, or any JSON string.

Formatted output

Root type -

Items / keys -

Characters -

Lines -

Privacy-first: formatting and validation happen entirely in your browser. Sensitive payloads stay on your device.

How to use this JSON formatter

Paste raw JSON into the input panel.
Use Format to pretty-print it or Minify to remove whitespace.
Use Validate when you only want an error check without changing the output.
Copy the cleaned result or review the error panel for the likely fix.

Why developers use a JSON beautifier

JSON often arrives as a single unreadable line from APIs, log streams, build tools, and webhook payloads. A formatter makes nested objects and arrays readable so you can debug faster, compare values more safely, and spot structural problems before data reaches production.

This page is especially useful when you need to inspect API responses, verify request bodies, review configuration files, or clean sample payloads before sharing them with teammates.

Common JSON mistakes this validator helps catch

Trailing commas: JSON does not allow a comma before a closing } or ].
Single quotes: Keys and string values must use double quotes.
Unquoted keys: {name: "Ada"} is valid in JavaScript objects, but not valid JSON.
Missing braces or brackets: Large payloads often fail because one closing character is missing.
Broken strings: Unescaped line breaks or quotes inside strings can invalidate the whole document.

Format vs. minify JSON

Formatting adds indentation and line breaks so humans can read the structure. Minifying removes extra whitespace so the payload is smaller for storage, transport, or embedding inside requests and environment variables. The underlying data stays the same.

When to sort JSON keys

Sort keys rewrites every object in alphabetical order without changing array order or values. This is useful before running diffs, reviewing API snapshots, comparing fixture files, or creating stable test data. Consistent key order reduces noisy changes and makes real differences easier to spot.

What Repair JSON fixes

Repair JSON is a cleanup pass for near-JSON copied from logs, config files, or JavaScript snippets. It can remove trailing commas, strip comments, convert single-quoted strings, and wrap bare object keys in double quotes before formatting the result. Use it when a payload is almost valid JSON but still fails parsing.

Save a local draft between sessions

Enable Remember draft to keep your current JSON, indent preference, last action, and Auto-update setting in this browser. The saved draft stays local on your device, so you can leave and come back without re-pasting the same payload.

Should I use Auto-update or manual formatting?

Turn on Auto-update when you want live validation feedback while editing an API response or config file. Leave it off when you prefer to paste a large payload, make a few targeted edits, and run Format, Minify, Sort keys, or Validate only when you are ready.

Does this tool send my data anywhere?

No. Everything runs client-side in the browser with native JavaScript. That means you can inspect internal payloads, logs, tokens, and configuration snippets without uploading them to a third-party server.