Why is my JSON invalid?

The usual causes are a trailing comma, single quotes instead of double quotes, or a missing quote around a key. The validator points to the exact line and character.

Developer Tools

Formatters, converters and utilities for everyday coding tasks.

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Image to Base64

Encode an image to a base64 data URI, or decode one back to an image.

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JSON Formatter

Free JSON formatter and beautifier. Pretty print minified JSON with 2 spaces, 4 spaces or tabs, sort keys, see the exact line of any error and auto-fix common mistakes. Runs in your browser.

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JSON Viewer

Free JSON viewer. Explore JSON as a collapsible tree, search keys and values, and copy the path or value of any node. Handles large files privately in your browser.

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JSON to CSV

Free JSON to CSV converter. Turn a JSON array or API response into a spreadsheet-ready CSV, flatten nested objects, choose the separator and preview the table. Runs in your browser.

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CSV to JSON

Free CSV to JSON converter. Turn CSV, TSV or Excel exports into a JSON array of objects, with auto-detected separator, type detection and a table preview. Runs in your browser.

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Which tool do I need?

Everything runs in your browser, so you can paste API responses and config files without sending them to a server.

Read or fix JSON
JSON Formatter JSON Viewer
Make JSON smaller
JSON Formatter
Move data between JSON and a spreadsheet
JSON to CSV CSV to JSON
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Image to Base64

Questions

Why is my JSON invalid?: The usual causes are a trailing comma, single quotes instead of double quotes, or a missing quote around a key. The validator points to the exact line and character.

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