JSON Encode & Decode Tool Online
Safely encode and decode JSON strings for transport or storage. Our free JSON Encode Decode Tool handles special characters and ensures your data survives serialization correctly.
About JSON Encode & Decode Tool
JSON data often needs to be encoded for safe transmission in URLs or query parameters. This tool encodes JSON strings using URI encoding or decodes them back to readable format, handling special characters correctly.
How it works
Choose Encode or Decode mode using the tabs. Paste your input and click the process button. Encoding converts special characters to percent-encoded format, while decoding reverses the process.
The Swap button lets you quickly switch between modes and moves the output to input for round-trip testing. Results can be copied or downloaded as text files.
When you'd use this
You need to pass JSON data in a URL query parameter or store it in a place that requires encoding. Encode it here first to ensure special characters don't break your URL.
This uses standard URI encoding (encodeURIComponent), not base64. For base64 encoding, you'd need a different tool. URI encoding is safer for URLs but produces longer output.
Questions
What encoding method is used?
The tool uses encodeURIComponent, which percent-encodes special characters. This is standard for URL-safe encoding.
When should I encode JSON?
Encode JSON when including it in URLs, query parameters, or HTML attributes where special characters could cause parsing issues.
Can I decode any encoded string?
Only strings encoded with encodeURIComponent can be decoded. Base64 or other encoding formats require different tools.
Does encoding change the data?
No, encoding is reversible. Decoding the encoded output gives you back the exact original JSON string.
Why is encoded JSON so long?
Percent encoding expands each special character to three characters (like %7B for {). This is normal and ensures safe transmission.