By Muhammad Wasim, Software Engineer and developer of ToolSphare
Every developer has a list of tiny jobs that interrupt real work: making a minified API response readable, checking what is inside a token, turning a curl command into code, or remembering which chmod number means what. Each job takes seconds once you have the right tool, and minutes when you go hunting for one.
I build and maintain ToolSphare, and its developer section started as my own collection of these helpers. Everything runs in the browser, there is nothing to install, and there is no sign-up. Here are the sixteen I use most, grouped by the type of work.
Working with JSON and data formats
JSON Formatter and Validator
The one I open most. The JSON formatter beautifies nested JSON with 2- or 4-space indentation, minifies it again for production, and highlights syntax errors with the exact line and character. Parsing runs client-side, so API payloads are not sent anywhere.
JSON Diff
When an API response changes between two versions, eyeballing the difference is painful. Compare two JSON objects side by side and see added, removed and changed values highlighted.
JSON to TypeScript
Paste a real API response into ToolSphare's JSON to TypeScript generator and get interfaces or type aliases back. Options include readonly fields and marking every property optional, which saves a lot of typing on a new integration.
YAML Validator and TOML to JSON
Configuration bugs are often a single bad indent. The YAML validator lints YAML with line-by-line error indicators. For Rust or Python projects, convert TOML to JSON or YAML with live syntax validation.
CSV to SQL
Importing a spreadsheet into a database? Generate SQL CREATE TABLE and INSERT statements from CSV, with column data types inferred automatically.
APIs, HTTP and tokens
cURL to Code
API docs love curl examples; your codebase does not. The cURL to code converter turns a command into JavaScript (Fetch or Axios), Python Requests, PHP and other languages.
HTTP Request Tester
To poke an endpoint without opening a full API client, the online HTTP request tester sends GET, POST, PUT and DELETE requests with custom headers and query parameters.
JWT Decoder
Need to check a token's claims or expiry? Decode a JWT in your browser and see the header and payload as formatted JSON. Decoding locally matters here, because tokens are credentials.
URL Parser
Long tracking URLs are hard to read. The URL parser breaks any URL into protocol, host, port, path and individual query parameters.
DevOps and servers
Docker Run to Compose
Turning a long docker run command into a tidy docker-compose.yml, with ports, volumes and environment variables, is tedious by hand. Convert docker run to Compose instead.
Nginx Config Generator
The Nginx config generator produces server blocks with reverse proxy, SSL/TLS, PHP-FPM and security headers. Always review generated configs before deploying, but it is a solid starting point.
Cron Expression Generator
Nobody remembers cron syntax. Build the schedule visually with the cron expression generator and read a plain-English explanation of what it means.
Linux chmod Calculator
Tick the read, write and execute boxes in the chmod permissions calculator and get the numeric code (such as 755 or 644) and the symbolic notation.
Subnet and CIDR Calculator
For network work, the subnet calculator shows subnet masks, usable host ranges, and network and broadcast addresses for any IPv4 CIDR block.
Front-end helpers
Regex Tester
Write a pattern, paste sample text, and see matches highlighted live with the regex tester. Flags are supported, so you can test case-insensitive or global matching.
How I use these in practice
A typical debugging session looks like this: I copy a failing request from the browser's network tab as curl, convert it with cURL to Code to reproduce it in a script, format the response in the JSON Formatter, diff it against a known-good response with JSON Diff, and decode the auth token with the JWT Decoder to check its expiry. Five tools, one tab, no installs.
A note on privacy
Developer data is often sensitive: tokens, internal URLs and customer records. Many of these ToolSphare tools state that they process data client-side. Even so, my advice is the same for any web tool: never paste production secrets into a site unless you understand how it handles them, and rotate any credential you accidentally expose.
Frequently asked questions
Are these tools a replacement for my IDE or API client?
No. They are for quick, one-off jobs, the moments when opening a full application or writing a throwaway script would take longer than the task itself.
Can I use them on a locked-down work laptop?
Usually yes. Because they run in the browser, there is nothing to install, which is often the main obstacle on corporate machines.
Do generated configs work as they are?
Treat generated Nginx, Docker Compose or cron output as a well-structured starting point. Review it against your environment, test it on staging, and only then deploy.
About ToolSphare
I am Muhammad Wasim, a software engineer at MindSphare IT in Pakistan. ToolSphare is my free, no-sign-up toolbox for developers, students and small businesses, covering PDFs, images, text, calculators and more alongside the developer tools above.
Suggestions and bug reports are welcome at contact@toolsphare.com. If one of these tools saves you time, consider sharing it with your team.
See the full developer toolkit at ToolSphare.
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