Introduction to co-body

co-body is a widely used middleware for parsing request bodies in Node.js applications. Whether you are working with JSON, form-urlencoded, or text input, co-body simplifies the process of handling different content types.

Quick Start

First, install the co-body package:

npm install co-body

API Documentation and Examples

1. Parsing JSON

const parse = require('co-body');

async function parseJson(ctx) {
  try {
    const body = await parse.json(ctx);
    console.log(body);
  } catch (err) {
    console.error("Error parsing JSON: ", err);
  }
}

2. Parsing Form-urlencoded

const parse = require('co-body');

async function parseForm(ctx) {
  try {
    const body = await parse.form(ctx);
    console.log(body);
  } catch (err) {
    console.error("Error parsing form: ", err);
  }
}

3. Parsing Text

const parse = require('co-body');

async function parseText(ctx) {
  try {
    const body = await parse.text(ctx);
    console.log(body);
  } catch (err) {
    console.error("Error parsing text: ", err);
  }
}

4. Handling Different Content Types

const parse = require('co-body');

async function parseBody(ctx) {
  try {
    let body;
    if (ctx.is('json')) {
      body = await parse.json(ctx);
    } else if (ctx.is('urlencoded')) {
      body = await parse.form(ctx);
    } else if (ctx.is('text')) {
      body = await parse.text(ctx);
    }
    console.log(body);
  } catch (err) {
    console.error("Error parsing body: ", err);
  }
}

5. Custom Options

const parse = require('co-body');

async function parseWithOptions(ctx) {
  try {
    const options = { limit: '1mb', strict: true };
    const body = await parse(ctx, options);
    console.log(body);
  } catch (err) {
    console.error("Error parsing with options: ", err);
  }
}

Example Application

Below is an example of how you can use co-body in a Koa application to handle different request bodies:

const Koa = require('koa');
const app = new Koa();
const parse = require('co-body');

async function bodyParser(ctx, next) {
  if (ctx.method === 'POST') {
    try {
      if (ctx.is('json')) {
        ctx.request.body = await parse.json(ctx);
      } else if (ctx.is('urlencoded')) {
        ctx.request.body = await parse.form(ctx);
      } else if (ctx.is('text')) {
        ctx.request.body = await parse.text(ctx);
      }
    } catch (err) {
      ctx.throw(400, 'Error parsing request body');
    }
  }
  await next();
}

app.use(bodyParser);
app.use((ctx) => {
  ctx.body = { message: 'Body parsed successfully', body: ctx.request.body };
});

app.listen(3000, () => {
  console.log('Server running on http://localhost:3000');
});

With the snippets above, you will be able to use co-body effectively in your Node.js APIs, enhancing your application’s ability to handle different content types seamlessly.

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