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JSON Formatter

Use JSON Formatter online to indent minified JSON and make nested objects easier to inspect. Process it locally, then copy or download the result.

Processed locally
Inputtext or page content
Outputprocessed content
Best fordevelopment and structured content

Related Tools

All Text & Data tools
JSON ValidatorJSON MinifierJSON to CSVJSON to XMLJSON to YAMLCSV to JSON

Combine this with another step

About this tool

About JSON Formatter

Paste JSON to make compact objects and arrays easier to read. The formatter uses standard JSON parsing and two-space indentation, then lets you copy the result or download a .json file. Use Try sample to explore the input and output before working with your own data.

How to format JSON

  1. Paste JSON or import a .json file up to 10 MB.
  2. Select Run tool, or press Ctrl/Command + Enter.
  3. Correct any syntax error while keeping your source text.
  4. Copy the formatted result or download the JSON file.

Editing the source clears the previous output. Run the tool again before using or downloading the revised result.

Strict JSON, comments and trailing commas

JSON requires double-quoted property names and strings. Comments, trailing commas and JavaScript expressions are not valid JSON and are not silently repaired. Use the JSON Validator for a focused syntax check, or the JSON Minifier when the final file should have less optional whitespace.

Number precision and duplicate keys

This workflow parses and serializes values using JavaScript. Very large integers can lose precision; duplicate object keys retain the last value. Keep the original when exact numeric identifiers or duplicate entries matter. Formatting also does not validate your application's schema or business rules.

Continue with structured data

Open JSON to CSV for a suitable tabular export, JSON to YAML for a YAML representation or JSON to XML for an XML workflow. If your source is a table, start with CSV to JSON before formatting. Check nesting and data types after a format conversion.

Local processing

Your source is processed in this browser during the normal workflow. Large pasted data can use substantial memory. Review the complete output before replacing important files.

Three simple steps

How it works

  1. 1
    Choose

    Add a supported file or paste your content.

  2. 2
    Process

    The tool works locally in your browser when supported.

  3. 3
    Download

    Save the result directly to your device.

Frequently asked questions

JSON Formatter FAQ

How do I format JSON online?

Paste valid JSON or open a .json file, run the formatter and copy or download the indented result. Ctrl or Command plus Enter also runs the tool.

Can the formatter repair invalid JSON?

No. It uses standard JSON parsing. Remove comments, trailing commas and single-quoted keys before formatting; an error leaves the source available for correction.

Can I download formatted JSON?

Yes. The formatted output can be copied or saved as a .json file. Changing the source clears the old output so you can run the formatter again.

Does formatting preserve large integers and duplicate keys?

JavaScript JSON parsing can lose precision for very large integers, and duplicate keys keep the last value. Keep the original and avoid this workflow when exact large-number digits or duplicate entries must be preserved.

Is my JSON uploaded?

No. Supported parsing and formatting run locally in the browser. File imports have a 10 MB limit; pasted text is also limited by available browser memory.