JSON formatter & validator
Paste minified API responses, config files, or webhook payloads — then format, minify, or validate with one click. Everything runs in your browser; your JSON is never uploaded to our servers.
1 · Paste JSON 2 · How it works How to FAQ
Very large inputs may freeze this tab—trim or split before you hit the limit.
Tip: Ctrl+Enter (Windows) or Cmd+Enter (Mac) formats.
Looking good. CloudyBot can call that API, read the JSON response, extract the fields you care about, and notify you when something changes — on a schedule, with a real cloud browser. No glue code required.
Try CloudyBot FreeFree plan · No credit card · 60-second setup
How it works
JSON (JavaScript Object Notation) is the lingua franca of modern APIs, configuration files, and event payloads. Services return compact, single-line JSON to save bandwidth; developers paste those blobs into tickets, logs, and chat. Reading that without whitespace is painful — and a single stray comma or mismatched brace can break the entire document.
This tool uses your browser’s built-in JSON.parse and JSON.stringify. When you click Format, we parse your text into a JavaScript value and write it back with indentation so objects and arrays line up visually. Minify does the opposite: it removes all non-essential whitespace so you can drop the result into a request body or storage. Validate runs the parser only and tells you whether the document is legal JSON — useful before you commit a config or deploy a webhook handler.
Because nothing is sent to CloudyBot’s servers, you can safely paste responses that contain internal field names, staging URLs, or other sensitive structure. (You should still avoid pasting live secrets into any website if your security policy forbids it — but technically, this page never transmits your input.) If you need the same workflow automated — polling an endpoint, diffing responses, alerting Slack or email — that is what the full CloudyBot product is for.
Common use cases
- Debug a minified API response from Chrome DevTools, curl, or Postman — format it to see nesting and typos.
- Validate config before commit —
package.json,tsconfig.json, CI matrices, and ESLint configs must be strict JSON (or JSON superset); catch errors early. - Prettify exports from databases, log aggregators, or “download as JSON” buttons in SaaS dashboards.
- Minify payloads before embedding in a mobile app or IoT bundle where every byte counts.
- Teach or document APIs — readable examples in README files and internal wikis.
- Sanity-check webhooks — Stripe, GitHub, and Shopify send JSON bodies; validate samples before writing signature verification code.
How to (quick steps)
- Paste your JSON into the text box.
- Click Format to pretty-print, Minify to compress whitespace, or Validate to check syntax without changing layout.
- Fix any parse error using the line and column hint, or read the formatted output in the pane below.
- Click Copy result to copy normalized JSON after Format or Minify succeeds.
- Edit the source and repeat until the payload looks right for your API or config.
You just formatted JSON. CloudyBot can fetch it for you.
Example: “Every morning at 8am, call our /api/status endpoint, parse the JSON, and message me if degraded is true.” CloudyBot runs in the cloud with a real browser session, rolling memory, and optional schedules — so you are not manually pasting into tools forever.
Free plan · No credit card · 60-second setup
JSON formatter, beautifier, and linter in one
People search for an online JSON formatter, JSON beautifier, JSON minifier, and JSON syntax checker depending on the job. This page does all of those: turn a single-line API response into readable structure, shrink a large document for transport, or confirm that a file is valid before you commit it. If you are comparing JSON pretty print tools, the differentiator here is privacy (client-side processing) and a clear path to CloudyBot when you want the same data checks automated on a schedule instead of repeated manual pastes. Hard billing caps are published on our pricing page if you upgrade from paste-only workflows.
Frequently asked questions
Is this JSON formatter free?
Yes. There is no signup, no usage counter, and no paywall. Use it as often as you like.
Is my JSON sent to your servers?
No. Format, minify, and validate run entirely in your browser. You can verify in DevTools Network that no request carries your paste when using those actions.
What is the difference between Format and Minify?
Format (beautify) adds line breaks and indentation for readability. Minify removes whitespace that JSON does not need, producing the smallest valid equivalent string.
What kinds of errors can this validator catch?
Any syntax error that JSON.parse rejects: trailing commas, missing quotes around keys, single-quoted strings (JSON requires double quotes), stray tokens, and unclosed brackets or braces. Line and column are shown when the browser provides them.
Can I paste large JSON or full API responses?
Yes. You can paste up to about 2 MB per attempt; formatting and validation run locally with no upload. If formatted output is longer than 400000 characters, the pane shows plain text without syntax highlighting so the tab stays responsive. Very large pastes may still feel slow on older machines—for huge logs, split the file or use a desktop editor.
What is CloudyBot?
CloudyBot is a hosted AI agent that can browse the web, use files, remember context across conversations, and run tasks on a schedule, with hard billing caps so you never get surprise overages. This formatter is a free utility; the product automates repetitive work instead of you pasting JSON manually.
Related tools
Chain JWT payloads into structured JSON, preview Markdown docs, or test extraction regex—all run locally in your browser:
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