JSON Formatter / Viewer
Format, validate, minify and compare JSON — all in your browser.
Output will appear hereProcessed in your browser — nothing is uploaded.
About this tool
JSON Formatter is a free tool for developers who work with JSON every day, whether you are inspecting an API response, editing a config file, or sanity-checking a data structure before shipping it. Just paste in raw, hard-to-read JSON and hit Format. The tool instantly indents and lays it out so the structure is obvious at a glance.
The key advantage is that it runs entirely in your browser. Nothing is uploaded to a server, so even if you paste JSON containing access tokens, customer records, or a confidential payload, you can be confident it never leaves your machine. That makes it a safe choice for sensitive work.
It does three core jobs:
- Beautify — adds indentation and spacing so minified, single-line JSON becomes readable again, with the nesting laid out clearly.
- Validate — tells you immediately whether the JSON is syntactically correct, and if not, points to the problem: a missing comma, a trailing comma, or the wrong kind of quotes.
- Minify — strips unnecessary whitespace down to a single line, shrinking the payload for transport over the network or embedding in code.
Reaching for a reliable json beautify and validate step saves a surprising amount of debugging time. Instead of hunting for the one bracket that never closed, let the tool show you, so you can stay focused on the real work. No signup, no install, nothing to configure. It works instantly on any device with a browser.
How to use
- 1Paste your JSON into the input box, or type it in directly — it formats live as you type
- 2Pick Pretty for clean indentation, or Minify to compress it onto a single line
- 3Need to compare two JSON documents? Switch to the Compare tab and paste both — added and removed lines are highlighted
- 4If something is wrong, the validator points out exactly where the JSON breaks, then copy the result and use it wherever you need it
Frequently asked questions
- Is this JSON Formatter really free?
- Yes, completely free with no signup and no usage limits. Open it and start formatting right away.
- Is my JSON sent to a server?
- No. Everything runs entirely in your browser, so your data never leaves your device. That makes it safe even for tokens, payloads, or confidential data.
- What is the difference between Format and Minify?
- Format (beautify) adds indentation and spacing so humans can read it, while Minify strips all whitespace to shrink the payload for sending over an API.
- Why does it say my JSON is invalid?
- Common causes are a missing comma, a trailing comma, single quotes instead of double quotes, or unquoted keys. The validator highlights the position so you can fix it fast.
- Does it handle large JSON files?
- It handles large files well since processing happens locally, so speed depends mainly on your device and browser.