Free Developer Tools — JSON Formatter, Base64 Encoder and More

A JSON formatter takes raw or minified JSON text and adds consistent indentation and line breaks to make it readable. Minified JSON puts everything on one line to reduce file size — useful in production, but impossible to read when debugging. Paste a minified API response or config file into the JSON Formatter and it instantly becomes scannable. The formatter also validates the input and flags any syntax errors that would prevent it from parsing.

Base64 encoding converts binary data (images, files, arbitrary bytes) into a string of printable ASCII characters. It is used when binary data needs to travel through systems that only handle text — email attachments, data URLs in CSS, JSON payloads that embed image content, and HTTP Basic Authentication headers all rely on Base64. The Base64 Encoder and Base64 Decoder on Toolbox Hub handle both directions instantly in your browser.

Open the Regex Tester, paste your pattern into the pattern field, and paste the text you want to test in the test field. The tool highlights every match in real time and shows capture group results. This is useful for verifying email validation patterns, extracting data from log files, and building search-and-replace rules for code editors.

A JSON Web Token (JWT) is a compact, URL-safe string used to transmit authentication and authorization data between systems. It has three Base64-encoded parts separated by dots: a header, a payload, and a signature. The JWT Decoder on Toolbox Hub separates these three parts and shows the decoded header and payload in readable JSON — useful for debugging auth flows, inspecting token expiry, and checking claim values during development. Note: decoding reveals the data but does not verify the signature without the secret key.

URL encoding (also called percent-encoding) replaces characters that are not valid in a URL with a percent sign followed by a two-digit hex code. A space becomes %20, an ampersand becomes %26. HTML encoding replaces characters that have special meaning in HTML markup with entity references. An ampersand becomes &, a less-than sign becomes <. Use URL encoding for query strings and links; use HTML encoding when inserting text into HTML to prevent injection issues.

Open the MD5 Generator or SHA256 Generator tool, type or paste the input text, and copy the resulting hash. Hashing is one-way — you cannot recover the original text from the hash. MD5 is fast and still used for checksums and non-security file verification. SHA256 is stronger and is used for password storage, digital signatures, and data integrity checks. For security-sensitive applications, always use SHA256 or stronger — MD5 is considered cryptographically broken.

Use the JSON to CSV Converter to flatten a JSON array into a spreadsheet-ready CSV file, or the CSV to JSON Converter to turn a CSV export into structured JSON. These are useful when moving data between APIs (which typically use JSON) and spreadsheet tools like Excel or Google Sheets (which use CSV). The converters handle the mapping automatically as long as the input is well-formed.

HTML minification removes whitespace, comments, and redundant characters from HTML source code to reduce file size. It does not change how the page renders — browsers ignore extra whitespace when rendering HTML. A minified HTML file loads slightly faster because fewer bytes travel over the network. The HTML Minifier tool on Toolbox Hub handles this in one step without any configuration needed.