JSON Formatter & Beautifier

About this tool

Beautify and validate JSON with clean 2-space indentation. If the JSON is invalid, you get a clear error message pointing to the problem.

Example

Input: {"a":1,"b":[2,3]}

Output: { "a": 1, "b": [2,3] }

Privacy

This tool runs entirely in your browser. Your data is processed locally and never uploaded to a server.

How to use this tool

1. Paste your JSON into the input box.
2. Click the format or validate button.
3. Review the prettified JSON with 2-space indentation.
4. If there is an error, fix the location the tool points to and try again.

Step by step, what happens

1. The tool reads your text as JSON and checks whether it is valid.
2. If the JSON is valid, it rewrites it with clean 2-space indentation and consistent spacing.
3. If the JSON is invalid, it stops and shows a clear error message with the problem area.
4. You can then correct the JSON and run the tool again until it parses cleanly.

Worked example

Imagine you pasted a compact JSON object from an API response and want it easier to read before editing it.

Input: {"name":"Ava","active":true,"roles":["admin","editor"]}

1. The tool checks that the text is valid JSON, including quotes, commas, and brackets.
2. It formats the object so each key and value is placed on its own line with 2-space indentation.
3. It keeps the data the same while making the structure easier to scan.

Tips and common mistakes

• Use double quotes around all JSON keys and string values, because single quotes are not valid JSON.
• Watch for trailing commas after the last item in an object or array, since they usually cause validation errors.
• If the tool reports an error, check the exact line or character position first, then look for a missing quote, comma, or bracket.
• Paste raw JSON, not JavaScript objects with comments or functions, because this tool validates strict JSON.

Frequently asked questions