JSON Formatter & Validator
Format, minify, and validate JSON instantly. Get precise error locations. Everything happens in your browser.
01Why this formatter
JSON, readable.
Four reasons backend devs, QA folks, and DevOps engineers keep this page on their bookmarks bar.
- 01
Pretty-print and minify in one place
Paste a single line and read it. Paste something nested and collapse it. Switch indents from 2 spaces to 4 to tabs without losing your place.
- 02
Errors point to the line
Bad JSON shows the parser message with a line and column number. No more squinting at red squiggles in your editor.
- 03
Runs in the browser, instantly
Type or paste — the formatted version updates as you go. No request to a server, no spinner, no clipboard race.
- 04
API responses stay private
Logs and API payloads often carry tokens and PII. Everything in this tool stays on your machine — we never see what you pasted.
02How it works
Paste, format, copy.
- response.json1{"id":42,"ok":true,2 "items":[1,2,3]}
Step 1Paste your JSON
Drop in a raw response, a log line, or a hand-typed config. The tool reads it the moment you stop typing.
- Indent2 spaces4 spacesTab
Step 2Pick an indent
2 spaces is the everyday default. 4 spaces or tabs for code that needs to match a specific style.
- CopiedFormatted{ "id": 42, "ok": true }JSON · ready
Step 3Copy the result
Hit Format or Minify, then Copy. Paste it into your editor, a doc, or the ticket you're filing.
03Use cases
When JSON needs to be readable.
Most of these come up several times a day. Knowing the workflow saves real time.
Inspect an API response
Backend returned a flat JSON blob. Format it, scroll the nested structure, find the field you needed.
Curl output → readable JSONDebug a failing webhook
Webhook payload is malformed. Paste it, see the line and column where the parser choked, fix the upstream system.
Webhook payload → diagnosticMinify before embedding
Need to embed JSON in a URL or HTML attribute? Minify first to drop every space and newline.
Pretty → minifiedTidy a config file
Hand-edited package.json or settings.json drifted into messy indents. Reformat with one click before you commit.
package.json → 2-space indentPaste into docs or tickets
Sharing an example payload? Format first so reviewers can actually read it without copying back into a formatter.
Log line → readable exampleSpot a missing comma fast
Parser errors point to the exact line. Quicker than scanning a 200-line response for the comma you forgot.
Line 47, col 13
04Quick tips
Format smarter.
A few habits to keep clipboard moves clean.
- 01
Tab indent for code
If you'll paste into a tab-indented codebase, switch to Tab here too so it lines up cleanly on the other side.
- 02
Minify for URLs and HTML attributes
Pretty JSON has whitespace that doesn't belong in query strings. Minify before encoding into a URL.
- 03
Look at the line number on errors
When parsing fails, the line and column point to exactly where JSON.parse gave up. That's almost always one character to the left.
- 04
Safe for sensitive payloads
Tokens, customer IDs, internal flags — all stay in your browser. Format payloads you'd never paste into a random web tool.
05Loved by
Backend devs and QA engineers use it daily.
API response in Postman, paste here, see the structure, find the bug. Saved me from installing yet another VS Code extension.
Validating webhooks during incidents. Errors with line/col mean I can pinpoint a malformed payload in seconds.
Filing bug tickets with formatted JSON examples just makes the reviewers' lives easier. Two-second job.
06Questions
JSON formatting, plainly answered.
Things people check before pasting their first payload. Anything missing? hello@wirelogs.com.
01What's the difference between Format and Minify?
Format adds indents and line breaks so JSON is readable. Minify strips every unnecessary space and newline for a single compact line — best for embedding in URLs, HTML attributes, or wire payloads where size matters.
02What if my JSON is invalid?
The tool shows the parser error with a line and column number. Usually that's a trailing comma, an unescaped quote, or a missing closing bracket. Fix that one spot and re-format.
03Does the tool send my data anywhere?
No. Parsing and formatting happen in your browser via the built-in JSON.parse. Wirelogs never sees what you paste — useful for API responses with tokens or private fields.
04Can I handle large JSON files?
Yes, up to whatever your browser tab can hold in memory — typically tens of megabytes without issue. For very large files, an editor like VS Code with a JSON viewer extension is more comfortable.
05Is it really free?
Yes. No usage cap, no watermark, no sign-up. Format as much JSON as your day demands.
06Why not just use jq or my editor?
Use whatever you like. This page exists for the moment you've got a JSON blob in your clipboard and want it readable in two seconds without opening a terminal or finding the right editor extension.
Ready when you are
Paste, format, ship.
Drop your JSON into the tool above and copy the formatted version. Nothing leaves your machine.
- <1msparse time
- Localprivate by design
- $0now and always