{"record":{"id":"a16b5e03c64eecc8","repo":"sveltejs/kit","slug":"missing-params-for-dynamic-route-id-id","errorCode":null,"errorMessage":"Missing params for dynamic route ID ${id}","messagePattern":"Missing params for dynamic route ID (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/kit/src/runtime/app/paths/client.js","lineNumber":73,"sourceCode":" *\n * // using a route ID plus parameters\n * const resolved = resolve('/blog/[slug]', {\n * \tslug: 'hello-world'\n * });\n * ```\n * @since 2.26\n *\n * @template {RouteIdWithSearchOrHash | PathnameWithSearchOrHash} T\n * @param {ResolveArgs<T>} args\n * @returns {ResolvedPathname}\n */\nexport function resolve(...args) {\n\tconst [id, params] = /** @type {[string, Record<string, string>?]} */ (args);\n\n\tif (id[0] === '/') {\n\t\t// route ID\n\t\tif (id.includes('[') && !params) {\n\t\t\tthrow new Error(`Missing params for dynamic route ID ${id}`);\n\t\t}\n\n\t\treturn (\n\t\t\t/** @type {ResolvedPathname} */ (base + pathname_prefix + resolve_route(id, params ?? {}))\n\t\t);\n\t}\n\n\treturn /** @type {ResolvedPathname} */ (base + pathname_prefix + '/' + id);\n}\n\n/**\n * Match a path or URL to a route ID and extracts any parameters.\n *\n * @example\n * ```js\n * import { match } from '$app/paths';\n *\n * const route = await match('blog/hello-world');","sourceCodeStart":55,"sourceCodeEnd":91,"githubUrl":"https://github.com/sveltejs/kit/blob/03f1687fe612ce3d2d9131139b5b188d9cf90c64/packages/kit/src/runtime/app/paths/client.js#L55-L91","documentation":"The $app/paths resolve() function builds URLs from route IDs. When given a route ID containing dynamic segments (e.g. /blog/[slug]) as the first argument, it requires a params object to fill those segments; without one the generated URL would be invalid, so it throws.","triggerScenarios":"resolve('/blog/[slug]') — a route ID containing '[' passed with no second params argument — from client code using $app/paths.","commonSituations":"Forgetting to pass params for dynamic routes while using route-ID based resolution (SvelteKit 2.12+ route IDs), passing params only for some call sites, or mistakenly treating a static route pattern with brackets as a path prefix.","solutions":["Pass a params object matching the route's dynamic segments: resolve('/blog/[slug]', { slug: 'hello' })","For static route IDs, omit brackets or simply don't pass params (they default to {})","Check that the ID is a real route from generated route types; use type checking so RouteId/RouteParams catch mismatches at compile time"],"exampleFix":"// before\nconst url = resolve('/blog/[id]');\n// after\nconst url = resolve('/blog/[id]', { id: '42' });","handlingStrategy":"validation","validationCode":"import { resolve } from '$app/paths';\n/** @type {Record<string, string>} */\nconst params = { slug: 'hello' };\nif (id.includes('[') && (!params || Object.keys(params).length === 0)) {\n  throw new Error(`resolve('${id}') requires params`);\n}\nconst url = resolve(id, params);","typeGuard":"/** @template {string} T */\nconst isDynamicRouteId = (id) => typeof id === 'string' && id.startsWith('/') && id.includes('[');","tryCatchPattern":"try {\n  const url = resolve(routeId, params);\n} catch (e) {\n  if (e.message.startsWith('Missing params for dynamic route ID')) {\n    console.error(`Provide params for ${routeId}`);\n  } else throw e;\n}","preventionTips":["Always pass a params object for route IDs containing [..] segments","Use TypeScript with generated $app/types RouteParams so missing params fail at compile time","Prefer named route helpers or href generation from route types","Validate params are complete before calling resolve in shared utilities"],"tags":["sveltekit","routing","paths","params"],"backgroundTag":"missing-route-param","analyzedSha":"03f1687fe612ce3d2d9131139b5b188d9cf90c64","analyzedAt":"2026-09-02T02:01:50.504Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-09T06:17:21.866Z"}