23:47:18 [WARN] [vite] Failed to load source map for [project root]/node_modules/astro/dist/vite-plugin-astro/index.js.
SyntaxError: Unexpected token '♠', "♠��z��" is not valid JSON
why am i getting this everytime i do a change to my files?
#23:47:18 [WARN] [vite] Failed to load source map
covert flame
mild bloomBOT
Hi @covert flame. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
The knowledge sources don’t mention this specific SyntaxError: Unexpected token '♠' ... is not valid JSON coming from astro/dist/vite-plugin-astro/index.js, so I can’t say with certainty what’s causing it.
What the docs do say:
- When Vite hits an internal problem, Astro surfaces it as an “Unknown Vite Error,” and the recommended next step is to consult Vite’s troubleshooting guide and/or open an issue if you can reliably reproduce it.[Unknown Vite error]
- Astro lets you pass custom Vite config via
viteinastro.config.*, which can sometimes be involved in odd bundling or source‑map behavior.[Vite config]
Because this looks like Vite trying (and failing) to parse something as JSON or a sourcemap, and it happens on every change, it’s likely an internal Vite/loader issue rather than something directly documented in Astro.
Given the limits of the docs, the best next steps (aligned with them) are:
- Check your terminal for any additional “Unknown Vite Error” or related stack trace and compare with Vite’s troubleshooting guide.[Unknown Vite error]
- Temporarily remove or simplify any custom
viteconfig inastro.config.*to see if the warning disappears.[Vite config] - If you can reproduce this in a minimal project, open an issue on Astro’s repo with steps to reproduce, as the docs explicitly ask for that for unknown Vite errors.[Unknown Vite error]