Code Toolkit
Formatters
Code Toolkit — Free Online Developer Tools Suite
Every developer has a graveyard of browser tabs. One for a JSON formatter, one for a Base64 decoder, one for a regex tester, and five more you cannot remember opening. Code Toolkit by FlickTool kills that problem entirely. It is a free, browser-based developer suite with 50+ utilities — all inside a single workspace, processing happens locally in your browser, nothing is sent to any server, and no account is needed.
How to Use Code Toolkit
- Open Code Toolkit in any browser — no login required.
- Use the sidebar search to find any tool by name instantly.
- Or browse by category — Formatters, Minifiers, Validators, Encoders, Converters, Testers, Generators, Hash & Security, JSON Super Tools, API Tools, Text & String, or File Utilities.
- Select the specific tool type from the horizontal tabs inside the workspace.
- Paste your code or click Upload to load a file up to 5MB.
- Click Process — or load a Sample to see the tool in action immediately.
- Copy the output or download it directly from the output panel.
- Toggle Advanced Options when you need more control over the processing behaviour.
What Each Category Actually Does
Formatters
Unreadable minified code or a badly indented API response is hard to debug. The formatter takes raw, compressed, or inconsistently indented code and outputs a clean, properly spaced version. You choose the indent size, whether to preserve newlines, and whether to wrap long HTML attributes. Supports HTML, CSS, JavaScript, JSON, XML, YAML, SQL, Markdown, Python, PHP, and Java — so it covers most of what lands in your terminal, editor, or clipboard on a given workday.
Minifiers
Before you push code to production, file size matters for load time. The minifier strips every comment, blank line, and unnecessary whitespace from your code, reducing the byte count without changing what the code does. For HTML you can also remove empty attributes and shorten hex colours. Three presets — Light, Aggressive, and Custom — let you control how far the minifier goes depending on whether you need to keep the output readable. Supports HTML, CSS, JavaScript, JSON, and XML.
Validators
A single missing bracket in a JSON config file or a malformed XML attribute can break an entire pipeline. The validator checks your code before you use it and points to the exact line where the problem is, not just tells you something went wrong. Supports JSON, HTML, XML, and YAML — the four formats most likely to silently break things when copied from documentation or API responses.
Encoders and Decoders
Encoding issues show up constantly in web work — APIs return Base64 strings, URLs break on special characters, and HTML entities appear in text where you expected plain content. This category handles every common web encoding in both directions:
| Tool | When You Actually Need It |
|---|---|
| Base64 Encode / Decode | APIs, data URIs, email attachments, authentication tokens all use Base64. Decode a JWT payload or encode an image to embed it inline in CSS. |
| URL Encode / Decode | Special characters like spaces, ampersands, and brackets break URLs. Encode them before building a query string or decode a messy URL to read it. |
| HTML Encode / Decode | Prevents XSS when displaying user input. Convert <, >, and & to safe HTML entities or reverse the process to read encoded content. |
| Hex to String / String to Hex | Useful when reading raw byte output, colour values, or network packet data where text has been converted to hexadecimal. |
| Binary to Text / Text to Binary | Convert between binary representation and readable text for low-level debugging or encoding exercises. |
| Escape / Unescape HTML, JSON, JS | When a string contains characters that would break the surrounding syntax — quotes inside JSON, angle brackets inside HTML — escaping makes it safe to embed. |
Converters
These tools convert structured data from one format to another, which comes up constantly when data from one system needs to go into another that speaks a different language.
JSON to CSV — When you get a JSON array back from an API and need to open it in Excel, share it with a non-technical teammate, or import it into a database tool, you need CSV. This converts the entire JSON array structure into columns and rows automatically.
CSV to JSON — The reverse. When you have exported data from a spreadsheet and need to feed it into a JavaScript app, Node script, or REST API, this converts each row into a properly structured JSON object.
JSON to XML / XML to JSON — Legacy enterprise systems, SOAP APIs, and configuration files often use XML while modern tooling uses JSON. These converters handle the structural translation so you do not have to write it yourself.
YAML to JSON / JSON to YAML — YAML is the standard format for Kubernetes configs, Docker Compose files, CI/CD pipelines, and GitHub Actions. JSON is what most JavaScript and Node tooling expects. Moving between them is a regular task when configuring or debugging modern infrastructure.
JSON to TypeScript — Paste a JSON object and get a typed TypeScript interface back. Saves significant time when you are adding type safety to a codebase and do not want to write out every property by hand.
JSON to SQL — Converts a JSON object or array into SQL INSERT or CREATE TABLE statements, useful when you are seeding a database from an API response or migrating data.
JSON to Mongoose — Generates a complete Mongoose schema definition from a JSON object, cutting out the boilerplate when building Node/MongoDB APIs.
HTML to JSX — Paste HTML from a static template, a design tool export, or a CMS and get clean JSX back. Handles attribute name differences like class → className and for → htmlFor automatically.
CSS to JSS — Converts standard CSS into JavaScript Style Sheet syntax for use with libraries like Material UI or JSS directly.
Testers
Regex Tester — Write a regular expression, set flags (global, case-insensitive, multiline, dotall, unicode, sticky), paste any test string, and see every match highlighted in real time alongside all capture groups. No more copy-pasting patterns into a console to see if they work.
Regex Generator — Describe what you want to match in plain language and get a working regex pattern. Useful when you know the logic but not the exact syntax.
JSON Diff — Paste two versions of a JSON object and see exactly what changed — added keys, removed keys, and modified values highlighted clearly. Essential when debugging API response changes or comparing config versions.
Code Diff — The same thing for any plain code or text. Paste two versions of a file side by side and see the differences line by line, without needing a full Git setup.
Syntax Highlighter — Renders code with language-appropriate colour highlighting. Useful for presentations, documentation screenshots, or simply reading unfamiliar code more easily.
Remove Comments — Strips all inline and block comments from code in a single pass. Useful before sharing code publicly or when cleaning up legacy files full of outdated notes.
Tabs to Spaces / Spaces to Tabs — When a project has inconsistent indentation or your editor and a colleague’s editor disagree on tab width, this fixes it across an entire code block instantly.
Generators
JSON Schema Generator — Takes a sample JSON object and generates a valid JSON Schema document from it. Saves the repetitive manual work of writing schemas for validation libraries like Ajv.
Slug Generator — Converts any text — a blog title, a product name, a heading — into a clean URL-safe slug. Handles accents, spaces, and special characters.
JWT Decode is listed under Hash and Security (see below) but the generators here focus on code output rather than security operations.
Hash and Security Tools
MD5 / SHA1 / SHA256 / SHA512 — Generate cryptographic hash values from any string. MD5 and SHA1 are fast but considered weak for security purposes; SHA256 and SHA512 are the current standards for data integrity checks, digital signatures, and secure comparisons.
HMAC — Hash-based Message Authentication Code. Generates a hash using both your input and a secret key, making it tamper-evident. Used in webhook signature verification, API authentication headers, and secure token generation.
bcrypt — A slow hashing algorithm specifically designed for passwords. Its intentional slowness makes brute-force attacks computationally expensive, which is why it is the standard for password storage in most modern web frameworks.
JWT Decode — Decodes the payload of a JSON Web Token without needing the signing secret. Useful for quickly reading what claims a token contains during debugging without having to set up a full verification step.
Password Strength — Analyses a password against criteria including length, character variety, and common patterns, and gives you a clear strength classification so you can make informed decisions about password requirements.
JSON Super Tools
When your primary data format is JSON, these eight dedicated operations cover the full maintenance and debugging workflow:
Prettify formats compressed JSON with clean indentation so you can read it. Compress does the opposite — removes all whitespace for production payloads. Repair automatically fixes the most common JSON errors — trailing commas, unquoted keys, single quotes — that APIs and copy-paste operations introduce. Lint goes further, identifying every syntax violation with line references. Sort Keys alphabetically reorders all object keys, making large JSON objects easier to scan and diffs easier to read. Flatten converts a deeply nested JSON structure into a single-level object using dot-notation keys, which is useful for database storage and logging. Unflatten reverses this. To Table renders a JSON array as an HTML table, giving you a clear visual summary of the data without exporting to a spreadsheet.
API and Web Tools
These tools are for the parts of API work that happen outside of writing the actual code.
CURL Generator takes a URL, method, headers, and body and builds the complete curl command ready to paste into a terminal. Fetch Generator and Axios Generator do the same for JavaScript — paste the API details and get a complete, copy-ready request block in your preferred library.
HTTP Status Explorer is a searchable reference for every HTTP status code with a clear explanation of what each one means and when a server returns it — so you stop Googling 418 status code mid-debugging.
Query String Parser breaks a URL query string like ?sort=date&page=2&filter=active into a structured key-value view so you can read it clearly. Query String Builder does the reverse — give it key-value pairs and it outputs a properly encoded query string.
URL Parser dissects any URL into its protocol, host, path, port, query string, and fragment so you can inspect each component separately. User Agent Parser decodes browser user agent strings into readable browser name, version, OS, and device type. MIME Type Lookup returns the correct MIME type for any file extension.
Text and String Utilities
Case Converter handles camelCase, PascalCase, snake_case, kebab-case, UPPER CASE, lower case, and Title Case in a single click — useful for normalising variable names, database column names, or API field keys.
Deduplicate Lines removes every repeated line from a block of text, keeping only the first occurrence. Useful when merging lists, cleaning up log output, or removing repeated imports.
Smart Cleanup goes beyond whitespace removal — it normalises inconsistent spacing, fixes mixed line endings, trims leading and trailing whitespace from every line, and collapses multiple blank lines into one.
File Utilities
Base64 File Converter encodes any uploaded file to a Base64 string, or decodes a Base64 string back to a downloadable file. Common use case: embedding small images or fonts directly into CSS without a separate HTTP request.
ZIP Output packages your processed output files into a ZIP archive for a single clean download.
Key Features
- 50+ tools across twelve categories accessible from a single sidebar
- Sidebar search — find any tool in two keystrokes without clicking through categories
- Processing history — last 100 operations saved locally, including input, output, and tool used
- File upload — paste code or upload any text-based file up to 5MB directly into the input panel
- Advanced Options per tool — indent size, minification presets, encoding flags, and more
- Nothing leaves your browser — all processing is client-side, no data is transmitted
- Light and dark mode with system preference detection
- Completely free — no account, no rate limits, no paid tiers
Frequently Asked Questions
1. Is Code Toolkit completely free?
Ans. Yes. Every tool is free with no account required and no usage limits.
2. Is my code sent to a server?
Ans. No. Every operation runs entirely in your browser using JavaScript. Your code never leaves your device.
3. Does it save my processing history?
Ans. Yes. Up to 100 recent operations are saved in your browser’s local storage so you can revisit previous inputs and outputs. You can clear the history at any time from the History panel.
4. Can I upload files instead of pasting?
Ans. Yes. The Upload button in the input panel accepts any text-based file up to 5MB — useful for large JSON files, SQL dumps, or minified scripts.
5. What is the difference between the JSON Validator and JSON Lint in JSON Super Tools?
Ans. The Validator checks whether your JSON is syntactically valid and tells you if it is not. JSON Lint goes deeper — it reports every individual issue with line references so you can fix each one precisely, rather than just knowing something is wrong.
6. Can I use Code Toolkit on mobile?
Ans. Yes. The sidebar is collapsible and accessible via the mobile menu button, and the workspace adjusts for smaller screens.