Developer Tools

Handy utilities for everyday development. All processing happens locally in your browser, so tokens and data you paste never leave your device.

Runs in your browser · nothing uploaded
JSON Formatter & ValidatorPretty-print, minify and validate JSON with error locations.CSV to JSON ConverterConvert CSV to JSON, or JSON back to CSV, with automatic delimiter and header detection.Base64 Encode & DecodeConvert text to Base64 and back, with full Unicode support.Unix Timestamp ConverterConvert Unix time to a readable date and back.Regex TesterTest regular expressions with live match highlighting.UUID GeneratorGenerate random version-4 UUIDs in bulk.URL Encoder & DecoderPercent-encode or decode URLs and inspect their query parameters.JWT DecoderDecode a JSON Web Token’s header and payload.Hash Generator (MD5, SHA-256)Create MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes.

About Developer Tools

The developer tools on i40x cover the small jobs that come up every day when you write, debug or integrate software. Format and validate JSON, encode Base64 and URLs, generate UUIDs and hashes, test regular expressions, convert Unix timestamps and decode JWT tokens, all from one place without installing anything. Each tool opens on its own page with a short guide and answers to common questions.

The suite contains eight tools: JSON Formatter, Base64 Encode and Decode, URL Encoder and Decoder, UUID Generator, Hash Generator, Regex Tester, Unix Timestamp Converter and JWT Decoder. Every tool runs in your browser, so the text you paste is not uploaded to our servers. They are free, need no sign-up and add no watermark. Use them together, for example decoding a JWT and then converting its exp value to a date.

Other categories

PDF ToolsImage ToolsCalculatorsGeneratorsText ToolsDesign Tools