How to format JSON online
To format JSON, open the ToolCrix JSON Formatter, paste your JSON and click Format — the tool indents it for easy reading, validates the syntax (highlighting any errors) and can also minify or convert it to TypeScript types. Everything runs in your browser, so secrets and customer data stay private.
Need to format, validate or minify JSON quickly? This free browser JSON formatter beautifies messy JSON, catches syntax errors, minifies for production, and can even generate TypeScript types — all locally, so your data never leaves your machine.
Why developers need a private JSON formatter
Raw API responses and config files are often a single unreadable line. A formatter indents them so you can actually read the structure, and a validator pinpoints the missing comma or bracket that's breaking your parse.
Pasting JSON into a random online tool can leak secrets — tokens, keys, customer data. ToolCrix processes everything in your browser, so sensitive payloads stay private.
How to use it (step by step)
- Open the JSON Formatter.
- Paste your JSON into the input.
- Click Format to beautify, or Minify to compress it.
- If there's an error, the validator shows what and where.
- Optionally generate TypeScript types, then copy or download the result.
What you can use it for
- Reading and debugging API responses.
- Validating JSON before deploying a config.
- Minifying JSON to reduce payload size.
- Generating TypeScript interfaces from sample data.
- Cleaning up exported data.
Format vs minify
Format (beautify) adds indentation and line breaks for humans. Minify strips all whitespace to make the smallest possible file for machines and network transfer. Use format while developing and minify for production.
Tips
- Validate before shipping config to catch errors early.
- Generate TypeScript types to get instant, accurate interfaces.
- Minify JSON you send over the network to save bandwidth.
- Never paste secrets into upload-based tools — this one is local.
Frequently Asked Questions
How do I format JSON online?
Paste your JSON into the ToolCrix JSON Formatter and click Format — it indents everything for easy reading, instantly.
Does it validate JSON?
Yes. Invalid JSON triggers a clear error message so you can find the problem fast.
Is the JSON formatter free?
Yes — free, instant and private, with no sign-up.
Is my JSON uploaded anywhere?
No. All processing happens in your browser, so secrets and data stay private.
Can it generate TypeScript types?
Yes — it can turn your JSON into TypeScript interfaces you can copy straight into your code.
How do I find the error in invalid JSON?
Paste it into the ToolCrix JSON Formatter and click Format — the validator highlights the exact position and reason for the syntax error (missing comma, unclosed string, etc.).
Can I convert JSON to TypeScript types?
Yes — the JSON Formatter has a one-click TypeScript export that generates ready-to-use interfaces from your JSON, so you can paste them straight into your code.
Try it now: open the free JSON Formatter or the Text Case Converter, or browse more guides.