JSON Beautifier

Format and pretty-print JSON with validation

Takes minified or poorly formatted JSON and makes it readable. Paste a raw API response or a scraped JSON blob and get an expandable tree or indented text. Useful when debugging API responses where the raw output is one long line you can't reason about.

Input
Output
Formatted JSON will appear here…

How to use

  1. 1Paste JSON — Minified, unformatted, or partially broken JSON — all accepted.
  2. 2Get results — In auto mode, JSON is formatted instantly on paste. Disable auto mode to run manually with Run.
  3. 3Explore the structure — Use the tree view to navigate nested objects and arrays.
  4. 4Copy the result — The Copy button puts the formatted JSON on the clipboard.

Examples

API response in one line
{"id":1,"name":"Test","items":[{"price":99}]}
Open a minified API response — after formatting the structure and all fields become immediately visible.
Nested configuration
{"server":{"host":"localhost","port":3000},"db":{"url":"..."}}
Explore the nesting depth — the tree view shows object levels without scrolling through a long line.
Array of objects from scraped data
[{"title":"Item 1","price":"$10"},{"title":"Item 2","price":"$20"}]
Verify scraped data before writing to a database — confirm all fields are present and the structure is correct.
Data from a __NEXT_DATA__ script
{"props":{"pageProps":{"items":[{"id":1}],"total":124}}}
Copy the __NEXT_DATA__ script tag content and inspect the structure — it often contains all the data you need without extra requests.
Error response from an API
{"error":{"code":404,"message":"Not found","details":[]}}
Format the error body — the message field and code are immediately visible without parsing the string manually.

When to use for web scraping

After scraping, sites often return JSON — from an API, AJAX request, or embedded __NEXT_DATA__ script. Minified JSON is impossible to read without formatting. Workflow: use Request Tester to send a request to an API, see a long JSON string in the response body — paste it here and instantly understand the data structure. Which fields are available, how objects are nested, what the endpoint actually returns. Also useful for debugging your own scraped data before writing to a database or file.

FAQ

What's the difference from JSON Minifier?›
JSON Beautifier improves readability (adds indents and line breaks), JSON Minifier removes extra whitespace for compactness. These are opposite operations on the same transformation.
Does the tool fix JSON errors?›
No, JSON is a strict format. Trailing commas, single quotes, comments — all of these are invalid JSON. The tool will show a parse error. For non-standard JSON (e.g., JSONC) you need pre-processing.
Is there a size limit?›
Large JSON files (several MB) may slow down the browser. For very large files, jq in the terminal is a better choice.
How do I format JSON from an API response in one step?›
Copy the response body from Request Tester or DevTools (Network → Response tab), paste into the field — in auto mode the result appears immediately. Structure and all fields display instantly — no need to write a formatting script.
Why is JSON invalid when it visually looks correct?›
The most common cause is a trailing comma (extra comma after the last element), single quotes instead of double quotes, or comments — all invalid JSON. The tool shows the line with the error — find and fix it.

Related tools

JSON MinifierReverse operation — strip whitespaceRequest TesterGet a JSON response from an APIDiff CheckerCompare two JSON responsesEncoder / DecoderDecode Base64 values inside JSON