JSON Validator and Formatterv1.0.0

Validate JSON online, format JSON for readability, and fix errors fast. Paste or type your JSON, run validation, and see exact line and column details that point to the problem. Use pretty print to apply consistent two-space indentation or use compress to minify for faster transfer and storage. Improve API debugging, configuration hygiene, and data review with a focused, accessible editor.

Follow these steps to check syntax, format output, and download clean JSON.

• Paste or type your JSON into the editor. Save your work automatically with local storage.
• Click Validate JSON to parse and highlight precise error locations or confirm that the JSON is valid.
• Enable Live validation to check while you type. Adjust the debounce interval to control performance.
• Toggle Allow comments (JSONC) to accept // and /* */ comments during validation.
• Click Compress to minify or use Validate JSON to pretty print with two-space indentation.
• Click Copy to place the result on the clipboard or Download to save a .json file.

Apply the validator and formatter to common development and data tasks.

• Validate API requests and responses to ensure correct quoting, commas, escapes, numeric formats, and valid literals such as true, false, and null.
• Clean configuration files such as package.json, tsconfig.json, and app settings to improve readability and consistency.
• Pretty print complex objects during code review to reduce confusion and speed up debugging.
• Minify large payloads before logging or transport to reduce size without changing data.
• Normalize output before commits to reduce diff noise and keep stable formatting across teams.

Use a small object to test formatting and validation:

{ "user": {"id": 42, "name": "Ada"}, "roles": ["admin", "editor"], "active": true, "meta": null }

Introduce an error to see line and column reporting:

{ "user": {"id": 42, "name": "Ada",} }

Remove the trailing comma, click Validate JSON, and confirm a success banner. Click Compress to produce a single line, or click Validate JSON again to pretty print with two-space indentation.

Does this tool support comments? Yes. Turn on Allow comments (JSONC) to accept // and /* */ during validation, which helps when you work with annotated configs.

What is the difference between pretty print and compress? Pretty print formats JSON with two-space indentation for readability. Compress removes extra whitespace to create a compact single-line string for network transfer or storage.

How do I share results? Click Copy to place the JSON on the clipboard or click Download to save a .json file that you can attach or commit.

Why do I see an error but my API accepts the payload? Some systems accept loose JSON, but strict JSON requires double-quoted strings, no trailing commas, valid escapes, and proper numeric formats. Use this validator to align with strict JSON rules.