Validate or reformat an API payload ↗
Get line and column errors, then format, minify, copy, or download JSON.
Local browser toolkit
Developer Tools
Clean up payloads, inspect tokens, transform data, and prepare values without pasting sensitive work into a remote service.
5tools available0file uploads
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{ }Developer
JSON Formatter
Format, validate, or minify JSON locally.
Open tool ↗B64DeveloperBase64 Encoder & Decoder
Encode or decode UTF-8 with Base64 or Base64URL.
Open tool ↗%DeveloperURL Encoder & Decoder
Encode URL components or full URLs locally.
Open tool ↗JWTDeveloperJWT Decoder
Inspect strict JWT structure, claims, and timing locally.
Open tool ↗&;DeveloperHTML Entity Encoder & Decoder
Encode for an explicit HTML context or decode browser-standard references.
Open tool ↗Choose by task
Start with the result you need
Inspect JWT structure and timing ↗
Decode canonical segments and exp, nbf, or iat without claiming signature verification.
Encode a parameter or complete URL ↗
Choose component or full-URL scope explicitly so structural delimiters are handled correctly.
Local-first
Finish the task, not a data upload
Tool inputs stay in temporary page state and are not added to site requests or processing history. Device, browser, extension, download, and clipboard security still matter.
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