100% Free & Browser-Based

Free Online JSON Tools for Developers

Format, validate, convert, and explore JSON in milliseconds. Everything runs client-side — your data never leaves your browser.

Explore all 9 tools ⌘ Format JSON now
json-formatter — JSONTools.pro client-side
input.json raw
{"id":4815,"user":"ada_lovelace","active":true, "roles":["admin","engineer"],"meta":{"createdAt":"2026-01-12","score":98.6,"verified":null,"tags":["json","tools"]}}
output.json formatted
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{ "id": 4815, "user": "ada_lovelace", "active": true, "roles": ["admin", "engineer"], "meta": { "createdAt": "2026-01-12", "score": 98.6, "verified": null, "tags": ["json", "tools"] } }
The toolkit

Nine tools. One click each.

Pick a tool and start working instantly — no signup, no upload, no wait.

Formatter
Beautify and indent messy JSON in an instant.
Validator
Catch syntax errors with precise line numbers.
Minifier
Strip whitespace to shrink payload size.
Diff
Compare two JSON objects side by side.
Viewer
Explore nested data as a collapsible tree.
JSONPath
Query and extract values with JSONPath.
JSON to CSV
Convert JSON arrays into clean CSV.
JSON to XML
Transform JSON into well-formed XML.
JSON to YAML
Export JSON as readable YAML.
Blazing Fast
Sub-second processing
Privacy First
No tracking, ever
No Install
Works in any browser
100% Free
No limits, no ads
FAQ

Questions, answered

What is JSONTools.pro?+
JSONTools.pro is a free collection of browser-based JSON utilities for developers. It includes a formatter, validator, minifier, diff tool, viewer, and converters for CSV, XML, and YAML.
Is my data safe when using these tools?+
Yes. All processing happens directly in your browser. Your JSON data is not uploaded to or stored on any server unless a specific operation requires server-side processing, in which case the data is processed and immediately discarded.
Are these tools really free?+
Yes, all tools on JSONTools.pro are completely free to use with no account required.
Do I need to install anything?+
No. All tools run directly in your web browser. There is nothing to download or install.
What browsers are supported?+
JSONTools.pro works in all modern browsers including Chrome, Firefox, Safari, and Edge.