URLfix

Development

Decode percent-encoded Persian (or any non-ASCII) URLs into a human-readable form, optionally replacing spaces with a separator. Use when displaying URLs in UI, logging, or generating slugs from copy-pasted percent-encoded URLs. Triggers on requests mentioning urlFix, URLfix, decode Persian URL, percent-encoded farsi, or "make this URL readable".

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Source SKILL.md: https://github.com/persian-tools/persian-tools/blob/HEAD/skills/URLfix/SKILL.md

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URLfix — decode percent-encoded URLs

import { urlFix } from "@persian-tools/persian-tools";
// CommonJS
const { urlFix } = require("@persian-tools/persian-tools");

The exported function is urlFix (camelCase), even though the module folder is URLfix.

Public export

urlFix(url?: string, separator?: string): string | undefined

Note: the function name is urlFix (lowercase u). Some older documentation refers to it as URLfix; the actual export uses camelCase.

What it does

If url is falsy, returns undefined (no throw).
Calls decodeURIComponent(url) to expand %xx escapes — including UTF-8 multi-byte sequences used for Persian and other non-ASCII characters.
If separator is provided, replaces the first space in the decoded URL with separator (single String.prototype.replace — not global).

import { urlFix } from "@persian-tools/persian-tools";

urlFix("https://fa.wikipedia.org/wiki/%D9%85%DA%A9%D8%A7%D9%86%DB%8C%DA%A9%20%DA%A9%D9%88%D8%A7%D9%86%D8%AA%D9%88%D9%85%DB%8C");
// "https://fa.wikipedia.org/wiki/مکانیک کوانتومی"

urlFix(
  "https://fa.wikipedia.org/wiki/%D9%85%DA%A9%D8%A7%D9%86%DB%8C%DA%A9%20%DA%A9%D9%88%D8%A7%D9%86%D8%AA%D9%88%D9%85%DB%8C",
  "_",
);
// "https://fa.wikipedia.org/wiki/مکانیک_کوانتومی"

Important caveats

The separator replacement is single-shot. Only the first space is replaced. If your URL contains multiple spaces, the rest stay literal.
urlFix does not re-encode the result. The returned string is human-readable but no longer a valid URL for HTTP requests. Use it for display, logging, or as input to a slug generator — not as fetch() target.
decodeURIComponent throws on malformed percent-encoding (e.g. lone % or invalid UTF-8 byte sequences). urlFix does not catch this. Wrap in try/catch if input is untrusted.
Returns undefined (not "") for falsy input. Type the call site accordingly:
```
const pretty = urlFix(rawUrl) ?? rawUrl;
```

When to use

Rendering recent Persian Wikipedia / blog links in a UI.
Logging an inbound request path for debugging.
Producing the input for slugify(...) from a copy-pasted URL.

When NOT to use

For round-tripping a URL through a system that will fetch it — keep the encoded form.
For cleaning URLs that need to be machine-readable downstream.

References

Tests: test/URLfix.spec.ts
Related: slugify skill for producing URL-safe slugs from the decoded form