Free JSONLint Alternative
JSONLint is one of the most popular JSON validation and formatting tools on the web, trusted by developers for its simplicity and reliability. It validates JSON syntax, formats it with customizable indentation, and even repairs broken JSON. All processing happens client-side in your browser, ensuring privacy and speed. While JSONLint is excellent for JSON-specific tasks, it only handles JSON. If you work with YAML configuration files or XML data alongside JSON APIs, you'll need separate tools. Fixie's JSON/YAML/XML Formatter handles all three formats in one unified interface.
Try JSON/YAML/XML Formatter Free →JSON/YAML/XML Formatter vs JSONLint
| Feature | Fixie JSON/YAML/XML Formatter | JSONLint |
|---|---|---|
| Price | Free forever | Free (Pro version available) |
| Signup Required | No | No |
| Privacy / Data Handling | 100% client-side — data never leaves your browser | 100% client-side |
| Formats Supported | JSON, YAML, XML | JSON only |
| Validation | Real-time syntax validation for all 3 formats | JSON validation with error locations |
| Format Conversion | Convert between JSON ↔ YAML ↔ XML | JSON only (no conversion) |
| Minify | Yes (JSON, YAML, XML) | Yes (JSON only) |
| Auto-Repair | Basic error recovery | JSON Repair feature |
| Ads | None | None |
Why Choose Fixie?
JSONLint is a fantastic tool for JSON validation and formatting, and its client-side processing ensures your data stays private. If you exclusively work with JSON, JSONLint's focused feature set — including JSON repair, JSONC support, and customizable indentation — makes it an excellent choice. The tool has been refined over years of use and is trusted by developers worldwide.
However, modern development often involves multiple data formats. You might be validating JSON API responses, formatting YAML configuration files for Docker or Kubernetes, and debugging XML feeds — all in the same project. Using JSONLint means switching to separate tools for YAML and XML, which fragments your workflow. Fixie consolidates all three formats into one interface, making it faster to switch between data types without changing tools.
Fixie also supports bi-directional conversion: transform JSON to YAML for cleaner config files, convert XML to JSON for API compatibility, or switch between formats as needed. While JSONLint excels at JSON-specific tasks like auto-repair, Fixie's multi-format support and conversion capabilities make it ideal for developers who work across the full spectrum of structured data formats.
How to Use JSON/YAML/XML Formatter
Step 1: Navigate to the Formatter
Go to fixie.tools/formatter — no signup or installation required.
Step 2: Select Your Format
Choose JSON, YAML, or XML from the format selector. Unlike JSONLint's JSON-only support, you can switch between all three formats in the same tool.
Step 3: Paste Your Data
Copy and paste your JSON, YAML, or XML data into the editor. The tool will automatically detect syntax errors and highlight them in real-time.
Step 4: Format, Validate, or Convert
Click the format button to pretty-print your data with proper indentation. Use the minify option to compress it, or convert it to a different format (JSON ↔ YAML ↔ XML). All processing happens locally in your browser — your data never gets sent to a server.