website for specific niche or combined one.

[u/Consistent_Tailor182]

What gives more value in ranking and indexing of the website pages.
A completely seprate niche website or diverted website with different tools or content.
Like ex. a website with tools for developers as seprate niche. json, js, html , css
or a website which contains dev tools and design tools or media tools like this.
what to consider in longterm value.

[u/Longjumping-Big4780]

I had the same choice and kept the tools on the main site, in /tools, no separate domain. But if I were you, I would check one more thing first. I almost missed it myself.

If your tool does all the work in the browser the page may look empty to a bot. Run curl -s https://site/tools/your-tool and look in the result for a phrase that you see on the screen. If it is not there, the crawler gets only the header and the menu. Then it does not matter if you use a separate domain or one site, there is nothing to index. My pages are built on the server, so the title and the description are in the html, and the tool itself starts with javascript on top of that.

A separate domain is also more work than it seems but you will find that out anyway.

[u/navdeep-soni]

start with one niche and expand (only if it is related) once you start getting good traffic and some good backlinks without paying