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Every AI engineer knows the pain: you log a prompt while debugging, and it lands in your console as one endless escaped line — \n everywhere, JSON crammed inline, system/user/assistant turns all mashed together. Unreadable. FormatTools fixes exactly that. Paste the mess on the left, get a clean, color-coded conversation on the right — roles split, newlines restored, inline JSON pretty-printed. Works with OpenAI, Claude and other LLM APIs. 100% in your browser — nothing is ever uploaded.
Hi Product Hunt! 👋
If you build with LLMs, you've lived this pain:
You're debugging a complex prompt, so you log it. You open your console or cloud logs and... it's one giant, ugly line. `\n` instead of actual line breaks. JSON payloads crammed inline. The system, user, and assistant turns all fused together into an unreadable wall of text. To figure out what you actually sent to the model, you end up manually un-escaping a string in a text editor.
I got tired of doing that by hand, so I built FormatTools.
Paste that logged mess on the left — get a clean, color-coded conversation on the right:
• Unescapes `\n`, `\t`, and quotes back into real formatting
• Pretty-prints inline JSON payloads automatically
• Splits system / user / assistant / tool messages into separate, labeled blocks
• Works with OpenAI, Claude, and other popular LLM API formats
Security-wise, it runs 100% client-side in your browser. No signup, no backend — your prompts never leave your machine, which is crucial when you're pasting real production logs.
It's completely free. This started as my own internal debugging tool, so I'd genuinely love to hear from other LLM devs: what features would make this your daily driver? A prompt diff view? Token counts? Let me know in the comments! 👇
(P.S. There are also Markdown and HTML formatters on the site if you need them — but the prompt formatter is the one I actually built this for!)
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About FormatTools on Product Hunt
“Make your logged LLM prompts actually readable”
FormatTools was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #76 on the daily leaderboard. Every AI engineer knows the pain: you log a prompt while debugging, and it lands in your console as one endless escaped line — \n everywhere, JSON crammed inline, system/user/assistant turns all mashed together. Unreadable. FormatTools fixes exactly that. Paste the mess on the left, get a clean, color-coded conversation on the right — roles split, newlines restored, inline JSON pretty-printed. Works with OpenAI, Claude and other LLM APIs. 100% in your browser — nothing is ever uploaded.
FormatTools was featured in User Experience (366.6k followers), Marketing (465.8k followers) and Developer Tools (515.4k followers) on Product Hunt. Together, these topics include over 183k products, making this a competitive space to launch in.
Who hunted FormatTools?
FormatTools was hunted by New User. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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