Free JSONLint Alternative
JSONLint is one of the oldest JSON validators on the web, but the site is cluttered with ads and offers limited functionality beyond basic validation. Toolin provides a clean JSON formatter with syntax highlighting, error reporting, and additional conversions.
Why Switch from JSONLint?
- Interface cluttered with intrusive ads
- No JSON-to-YAML or JSON-to-other-format conversion
- No syntax highlighting or code folding
- No offline support
- Basic error messages with limited context
Toolin is 100% Private
Every tool runs entirely in your browser. Your files and data never leave your device — unlike JSONLint which processes files on remote servers.
JSON Formatter
Replaces JSONLint’s “JSON Validator”
| Feature | JSONLint | Toolin |
|---|---|---|
| Validate JSON | Yes | Yes |
| Pretty-print / format | Yes | Yes |
| Syntax highlighting | No | Yes |
| Clean ad-free interface | No | Yes |
JSON to YAML
Replaces JSONLint’s “JSON to YAML”
| Feature | JSONLint | Toolin |
|---|---|---|
| Convert JSON to YAML | No | Yes |
| Convert YAML to JSON | No | Yes |
| Bidirectional conversion | No | Yes |
| Works offline | No | Yes |
Diff Checker
Replaces JSONLint’s “JSON Diff”
| Feature | JSONLint | Toolin |
|---|---|---|
| Compare two JSON files | No | Yes |
| Side-by-side diff | No | Yes |
| Highlight differences | No | Yes |
| Works with any text | No | Yes |
Frequently Asked Questions
- Why use Toolin instead of JSONLint?
- Toolin offers a cleaner interface without intrusive ads, plus additional features like JSON-to-YAML conversion, syntax highlighting, and a diff checker. It also works offline.
- Does Toolin validate JSON the same way?
- Yes. Toolin validates JSON syntax and shows clear error messages with line numbers, just like JSONLint but with a better editing experience.
- Can I use Toolin offline?
- Yes. Toolin is a progressive web app that works fully offline once loaded. JSONLint requires an internet connection.