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Postman to Bruno

Convert a Postman collection and environment into a Bruno collection folder you can open in the app or run with the CLI.

Start by exporting the collection from Postman in the Collection v2.1 format and, if you use one, the environment. See Postman migration for where to find the export buttons.

Convert the collection and environment

1. Read the arguments

Import the converter, the file writers from @usebruno/filestore, and Node's file helpers. Take the paths from the command line and print a usage line if any are missing. format is 'yml' for OpenCollection YAML or 'bru' for classic .bru files.

const [collectionFile, outputDir, environmentFile] = process.argv.slice(2);
if (!collectionFile || !outputDir) {
  console.error('Usage: node convert.mjs <postman-collection.json> <output-folder> [postman-environment.json]');
  process.exit(1);
}

const format = 'yml';

2. Add the helpers

safeName strips characters that are not allowed in file names. write saves a file and creates any missing parent folders. readJson reads and parses a JSON file.

const readJson = async (file) => JSON.parse(await readFile(file, 'utf8'));

const safeName = (name) => name.replace(/[<>:"/\\|?*\x00-\x1F]/g, '-');

const write = async (file, content) => {
  await mkdir(path.dirname(file), { recursive: true });
  await writeFile(file, content);
};

3. Convert

postmanToBruno resolves to the Bruno collection and a list of issues it could not convert cleanly. If an environment file was given, convert it and add it to the collection so it is written with the rest. See the API Reference for the full signature.

const { collection, issues } = await postmanToBruno(await readJson(collectionFile));

if (environmentFile) {
  collection.environments.push(postmanToBrunoEnvironment(await readJson(environmentFile)));
}

4. Write the collection settings and environments

brunoConfig holds the collection settings. For .bru collections it is written to bruno.json. For yml it is embedded in opencollection.yml. The collection root holds collection-level auth, headers, and scripts. Each environment gets its own file in the environments folder.

const brunoConfig = { version: collection.version, name: collection.name, type: 'collection', ignore: ['node_modules', '.git'] };

const root = stringifyCollection(collection.root || {}, brunoConfig, { format });
if (format === 'yml') {
  await write(path.join(outputDir, 'opencollection.yml'), root);
} else {
  await write(path.join(outputDir, 'bruno.json'), JSON.stringify(brunoConfig, null, 2));
  await write(path.join(outputDir, 'collection.bru'), root);
}

for (const env of collection.environments || []) {
  await write(path.join(outputDir, 'environments', `${safeName(env.name)}.${format}`), stringifyEnvironment(env, { format }));
}

5. Write the folders and requests

Each folder becomes a directory and each request a file. Folder-level auth, headers, and scripts go in folder.yml or folder.bru. A stack is used instead of recursion so deeply nested collections are safe.

const stack = collection.items.map((item) => [item, outputDir]);
while (stack.length) {
  const [item, parent] = stack.pop();
  if (item.type === 'folder') {
    const folderDir = path.join(parent, safeName(item.name));
    await mkdir(folderDir, { recursive: true });
    if (item.root) await write(path.join(folderDir, `folder.${format}`), stringifyFolder(item.root, { format }));
    for (const child of item.items || []) stack.push([child, folderDir]);
  } else {
    await write(path.join(parent, `${safeName(item.name)}.${format}`), stringifyRequest(item, { format }));
  }
}

6. Report

Print where the collection was written, then each issue with its severity, the path of the item, and a message.

console.log(`Collection written to ${outputDir}`);

for (const issue of issues) {
  console.warn(`${issue.severity}: ${issue.path}: ${issue.message}`);
}

7. Run the script

Run the script with Node.js, passing the paths as arguments.

```bash convert.mjs node convert.mjs [postman-environment.json] 

```bash convert.js
node convert.js <postman-collection.json> <output-folder> [postman-environment.json]

Where:

  • <postman-collection.json>: The collection exported from Postman
  • <output-folder>: The folder to create the Bruno collection in. It is created if it does not exist
  • [postman-environment.json]: Optional. An environment exported from Postman

The output folder looks like this (with format set to 'bru', the files are bruno.json, collection.bru, folder.bru, and .bru requests instead):

my-collection/
├── opencollection.yml
├── environments/
│   └── Dev.yml
├── Users/
│   ├── folder.yml
│   ├── List users.yml
│   └── Create user.yml
└── Ping.yml

One folder per Postman folder, one file per request, and the environment under environments.

Full script

The complete script, ready to copy. convert.mjs is an ES module with top-level await. convert.js is the same script as CommonJS, with the steps inside an async main function.

```javascript convert.mjs // Converts a Postman collection, and optionally an environment, into a Bruno collection folder. // Usage: node convert.mjs [postman-environment.json]

// ---- Arguments ----

const [collectionFile, outputDir, environmentFile] = process.argv.slice(2); if (!collectionFile || !outputDir) { console.error('Usage: node convert.mjs [postman-environment.json]'); process.exit(1); }

// 'yml' (OpenCollection YAML) or 'bru' (classic .bru files) const format = 'yml';

// ---- Helpers ----

const readJson = async (file) => JSON.parse(await readFile(file, 'utf8'));

// Strip characters not allowed in file names const safeName = (name) => name.replace(/[<>:"/\|?*\x00-\x1F]/g, '-');

// Write a file, creating parent folders as needed const write = async (file, content) => { await mkdir(path.dirname(file), { recursive: true }); await writeFile(file, content); };

// ---- Convert ----

// Resolves to the Bruno collection and a list of items that could not be converted cleanly const { collection, issues } = await postmanToBruno(await readJson(collectionFile));

// Add the environment so it is written with the collection if (environmentFile) { collection.environments.push(postmanToBrunoEnvironment(await readJson(environmentFile))); }

// ---- Write the collection folder ----

// Collection settings: bruno.json for .bru, embedded in opencollection.yml for yml const brunoConfig = { version: collection.version, name: collection.name, type: 'collection', ignore: ['node_modules', '.git'] };

// Collection-level auth, headers, and scripts const root = stringifyCollection(collection.root || {}, brunoConfig, { format }); if (format === 'yml') { await write(path.join(outputDir, 'opencollection.yml'), root); } else { await write(path.join(outputDir, 'bruno.json'), JSON.stringify(brunoConfig, null, 2)); await write(path.join(outputDir, 'collection.bru'), root); }

// One file per environment for (const env of collection.environments || []) { await write(path.join(outputDir, 'environments', ${safeName(env.name)}.${format}), stringifyEnvironment(env, { format })); }

// Folders become directories, requests become files. A stack avoids recursion on deep trees. const stack = collection.items.map((item) => [item, outputDir]); while (stack.length) { const [item, parent] = stack.pop(); if (item.type === 'folder') { const folderDir = path.join(parent, safeName(item.name)); await mkdir(folderDir, { recursive: true }); // Folder-level auth, headers, and scripts if (item.root) await write(path.join(folderDir, folder.${format}), stringifyFolder(item.root, { format })); for (const child of item.items || []) stack.push([child, folderDir]); } else { await write(path.join(parent, ${safeName(item.name)}.${format}), stringifyRequest(item, { format })); } }

// ---- Report ----

console.log(Collection written to ${outputDir});

// Each issue has a severity, the path of the item, and a message for (const issue of issues) { console.warn(${issue.severity}: ${issue.path}: ${issue.message}); } 

```javascript convert.js
// Converts a Postman collection, and optionally an environment, into a Bruno collection folder.
// Usage: node convert.js <postman-collection.json> <output-folder> [postman-environment.json]

const { postmanToBruno, postmanToBrunoEnvironment } = require('@usebruno/converters');
const { stringifyCollection, stringifyFolder, stringifyRequest, stringifyEnvironment } = require('@usebruno/filestore');
const { mkdir, readFile, writeFile } = require('fs/promises');
const path = require('path');

// ---- Arguments ----

const [collectionFile, outputDir, environmentFile] = process.argv.slice(2);
if (!collectionFile || !outputDir) {
  console.error('Usage: node convert.js <postman-collection.json> <output-folder> [postman-environment.json]');
  process.exit(1);
}

// 'yml' (OpenCollection YAML) or 'bru' (classic .bru files)
const format = 'yml';

// ---- Helpers ----

const readJson = async (file) => JSON.parse(await readFile(file, 'utf8'));

// Strip characters not allowed in file names
const safeName = (name) => name.replace(/[<>:"/\\|?*\x00-\x1F]/g, '-');

// Write a file, creating parent folders as needed
const write = async (file, content) => {
  await mkdir(path.dirname(file), { recursive: true });
  await writeFile(file, content);
};

// CommonJS cannot use top-level await, so the steps run inside an async function
async function main() {
  // ---- Convert ----

  // Resolves to the Bruno collection and a list of items that could not be converted cleanly
  const { collection, issues } = await postmanToBruno(await readJson(collectionFile));

  // Add the environment so it is written with the collection
  if (environmentFile) {
    collection.environments.push(postmanToBrunoEnvironment(await readJson(environmentFile)));
  }

  // ---- Write the collection folder ----

  // Collection settings: bruno.json for .bru, embedded in opencollection.yml for yml
  const brunoConfig = { version: collection.version, name: collection.name, type: 'collection', ignore: ['node_modules', '.git'] };

  // Collection-level auth, headers, and scripts
  const root = stringifyCollection(collection.root || {}, brunoConfig, { format });
  if (format === 'yml') {
    await write(path.join(outputDir, 'opencollection.yml'), root);
  } else {
    await write(path.join(outputDir, 'bruno.json'), JSON.stringify(brunoConfig, null, 2));
    await write(path.join(outputDir, 'collection.bru'), root);
  }

  // One file per environment
  for (const env of collection.environments || []) {
    await write(path.join(outputDir, 'environments', `${safeName(env.name)}.${format}`), stringifyEnvironment(env, { format }));
  }

  // Folders become directories, requests become files. A stack avoids recursion on deep trees.
  const stack = collection.items.map((item) => [item, outputDir]);
  while (stack.length) {
    const [item, parent] = stack.pop();
    if (item.type === 'folder') {
      const folderDir = path.join(parent, safeName(item.name));
      await mkdir(folderDir, { recursive: true });
      // Folder-level auth, headers, and scripts
      if (item.root) await write(path.join(folderDir, `folder.${format}`), stringifyFolder(item.root, { format }));
      for (const child of item.items || []) stack.push([child, folderDir]);
    } else {
      await write(path.join(parent, `${safeName(item.name)}.${format}`), stringifyRequest(item, { format }));
    }
  }

  // ---- Report ----

  console.log(`Collection written to ${outputDir}`);

  // Each issue has a severity, the path of the item, and a message
  for (const issue of issues) {
    console.warn(`${issue.severity}: ${issue.path}: ${issue.message}`);
  }
}

main();

Open the collection in the app or run it with the CLI

If you included an environment, it keeps its Postman name.