Developer tools

Format JSON, encode data, generate UUIDs and hashes, decode JWTs.

11 tools

• JSON Formatter

  Format, beautify and sort JSON with syntax highlighting. Pinpoints errors by line and column. Runs locally in your browser.

• JSON Validator

  Check whether JSON is valid and see the exact line and column of the first error, with a caret under the problem character.

• JSON Minifier

  Minify JSON by stripping whitespace to shrink payloads, with optional key sorting. Validated and processed locally in your browser.

• JSON to TypeScript

  Generate TypeScript interfaces or types from a JSON sample. Handles nested objects, arrays, unions, null and optional properties.

• URL Encoder

  Percent-encode text for safe use in URLs and query strings. Choose full-component or whole-URL mode. Runs in your browser.

• URL Decoder

  Decode percent-encoded URLs and query strings back to readable text. Malformed sequences are located instead of crashing.

• Base64 Encoder

  Encode text to Base64 with full UTF-8 support, optional URL-safe alphabet and padding control. Runs in your browser.

• Base64 Decoder

  Decode Base64 and URL-safe Base64 to text with UTF-8 support. Clear errors for invalid characters, length and padding.

• UUID Generator

  Generate random UUID v4 or time-ordered UUID v7 in bulk (up to 1,000). Copy all or download a .txt file. Runs in your browser.

• Hash Generator

  Calculate SHA-256, SHA-384 and SHA-512 hashes of text or files in your browser, and compare against an expected checksum.

• JWT Decoder

  Decode a JSON Web Token's header and payload and see exp, iat and nbf as dates. Decoding is not verification: the signature is not checked.