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an error handler for koa, hack ctx.onerror.

different withkoa-error:

• we can not just use try catch to handle all errors, steams' and events'errors are directly handle byctx.onerror, so if we want to handle allerrors in one place, the only way i can see is to hackctx.onerror.
• it is more customizable.

npm install koa-onerror

constfs=require('fs');constKoa=require('koa');const{ onerror}=require('koa-onerror');constapp=newKoa();onerror(app);app.use(ctx=>{// foo();ctx.body=fs.createReadStream('not exist');});

onerror(app,options);

• all: ifoptions.all exist, ignore negotiation
• text: text error handler
• json: json error handler
• html: html error handler
• redirect: if accepthtml ortext, can redirect to another error page

check out default handler to write your own handler.

koa-onerror will automatic seterr.status as response status code, anderr.headers as response headers.

MIT

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